NDIR Gas Analyzer

ZPA, ZPB, ZPG

Outstanding Sensitivity and Stability

0–5 ppm low-range measurement (ZPG)
Continuous and simultaneous measurement of up to 5 components (ZPA, ZPB)
Excellent zero-point stability: ±0.5% FS per week (ZPB, ZPG)
Easy-to-see LCD

ZPA

ZPB
ZPG

21C1-E-0012a
 Long-term stability for a wide range of

ZPA: standard type

ZPB: drift-less type

Single-Beam NDIR Sensor

Repeatability: ±0.5% FS or better Simple structure for ease of maintenance
Principle Infrared Gas inlet Gas outlet
Rear expansion
Mass flow sensor
source chamber Air flow
The mass flow sensor Converts the amount of infrared absorption
into electrical signals. Excellent noise
measures the amount 1 mm resistance thanks to the low impedance
of infrared absorbed in sensor. The absence of moving parts
the measurement cell. Motor
Measuring cell Front expansion Detector
Hot wire mass makes the device resistant to vibration and
chamber
Chopper Mass flow sensor air flow sensor semi-permanently usable.

Sample-Switching Method
• Low-level CO2 and CO: 0–5 ppm The analyzer has a motor-operated valve that switches
• ‌Long-term superior stability: zero drift ±0.5% FS per between the sample gas and the reference gas (zero
week gas) at a certain cycle. This allows the analyzer to
keep the zero point accurate and to deliver stable
measurement.

Sample Reference Sample Reference Sample Reference

Gas Analyzer ZPB or ZPG gas gas gas gas gas gas
SV1
Sample Exhaust
Output signal

Sample
com NO cell Concentration
gas Infrared source
NC Detector

Motor Zero point

Solenoid NC drift
Chopper
valve No signal
Reference Gas changeover cycle Time
gas (N2 com NO
SV2
or air)

Gas path NC: Normally Close NO: Normally Open ( Gas changeover)

Because the single-beam system is susceptible to temperature change and In the sample-switching method, the zero point drift is ignored and the measured
contamination in the measuring cell, the measurement range in this method is values exactly correspond to the concentration difference between the sample gas
usually 0–100 ppm at the best. By using the sample-switching method, ZPB and and the reference gas. Thus, the analyzer can deliver accurate and stable measure-
ZPG can deliver stable measurement for the range as low as 0–5 ppm. ment even in the range close to the zero point.

2
concentrations Applications
• ‌Refuse incineration plants
• ‌Boiler equipment
• ‌Incinerators, industrial furnaces
• ‌Air separation plants (ZPG)

ZPG: low-concentration measurement

Versatile functionality Standard functions　 Optional functions

Contact output Contact input

Range During auto Auto-calibration Average value
Output hold Auto calibration H/L alarm Output hold
identification calibration start reset

Range Simple zero Calibration RS-485 O2 converted O2 converted average, Atmospheric

switchover Analyzer error
calibration error communication value output O2 average output pressure correction

Tolerant to Interference Atmospheric Pressure Compensation (option)

Interference from moisture and other gases is reduced The adverse effect by fluctuations in atmospheric
by the compensation function and the sample- pressure is greatly eliminated.
switching method (ZPB and ZPG).
CO2 ana- CO ana- CH4 ana- SO2 ana- NO ana-
Interference gas lyzer lyzer lyzer lyzer lyzer
CO 1000 ppm ≤ ±1% FS – ≤ ±1% FS ≤ ±1% FS ≤ ±1% FS
ZPG Application Example
CO2 15% – ≤ ±1% FS*1 ≤ ±1% FS ≤ ±1% FS ≤ ±1% FS*2
H2O saturation at
20°C ≤ ±1% FS ≤ ±1% FS*3 ≤ ±1% FS – – Measurement of low-level CO2 and CO in air
H2O saturation at
– ≤ ±2%FS – ≤ ±2%FS ≤ ±2%FS separating plants
2°C
CH4 1000 ppm ≤ ±1%FS ≤ ±1%FS – ≤ 20 ppm –

*1: 0–200 ppm range: ≤ 2% FS

*2: 0–500 ppm range: ≤ 2% FS Air To N2 plants
*3: 0–500 ppm range: ≤ 2% FS Filter
N2
compressor
Interference for 0–200 ppm range may be greater than 2.0% FS depending on conditions.

To O2 plants
O2
compressor
Easy-to-See LCD
Air
compressor

Air separator

Refiner Recovered
N2
compressor Condenser

N2 O2

Storage tank

3
 Single beam 5 components max. NO SO2 CO2 CO CH4 O2

Standard type ZPA █ System

Mist filter configuration

Sample
example
Pump 3-way solenoid valve
Flowmeter

NO2/NO
Membrane
filter
NO,
gas SO2, 0–200 ppm range CO, or other gases with high-level moisture
converter
Flowmeter
(Pump) (For NOx
Mist filter Pump 3-way solenoid valve Membrane
measurement) filter
Atmospheric Solenoid FlowmeterNO /NO
Sample air Pump 3-way solenoid valve valve 2
gasMist filter converter Gas Membrane
(Pump) Solenoid
(For NOx filter
Sample * Electronic gas cooler valveNO2/NO analyzers
measurement)
gas Atmospheric Solenoid converter ZPA
air (Pump) valve (For NOx
Safety drain Drain measurement) Gas
trap
Atmospheric Solenoid Solenoid O2
analyzers
* Electronic pot
gas cooler valve
air valve analyzer
ZPA
Gas
ZFK7
Ball valve Solenoid analyzers
Safety drain* Electronic gas cooler
Drain valve
trap pot ZPA
O(When
2 using zirconia O2
Standard gas Standard gas
for zero for span analyzer)
analyzer
Drain Safety drain Drain ZFK7
calibration calibration Exhaust
Min. Max. trap potBall valve O2
analyzer (atmospheric
Standard gas Standard gas ZFK7(When usingpressure) zirconia O2
NO 0 … 200 ppm 0 … 5000 ppm Drain
Ball valve for zero for span analyzer)
* For NO, SO2, or 0–200 ppm range CO measurement,
calibration be sure (When
calibration to use an electronic
Exhaust
SO2 0 … 200 ppm 0 … 10 vol% Standard gas Standard gas using zirconia O2
cooler
Drain
to keep the moisture content for below
zero the level
for span saturation analyzer)
occurs at 2°C. (atmospheric
pressure)
CO2 0 … 100 ppm 0 … 100 vol% calibration calibration Exhaust
* For NO, SO2, or 0–200 ppm range CO measurement, be sure to use an(atmospheric electronic
CO 0 … 200 ppm 0 … 100 vol% pressure)
cooler to keep the moisture content below the level saturation occurs at 2°C.
CH4 0 … 500 ppm 0 … 100 vol% * For NO, SO2, or 0–200 ppm range CO measurement, be sure to use an electronic
O2 0 … 5 vol% 0 … 100 vol% cooler to keep the moisture content below the level saturation occurs at 2°C.
The O2 ranges above are for the built-in magnetic analyzer.

Single beam Sample switching 5 components max. NO SO2 CO2 CO O2

Drift-less type ZPB █ System configuration example

Membrane
Gas with no moisture Component eliminator Flowmeter filter
Gas Exhaust
Reference gas (atmospheric
Membrane
analyzers
(Humidified N2 or atmospheric air) pressure)
Component eliminator Flowmeter filter ZPB
Mist filter Pump
Membrane Exhaust
Gas
Sample
Reference gas
Component eliminator Flowmeter filter analyzers (atmospheric
(Humidified N2 or atmospheric air) ZPB pressure)
gas Exhaust
Mist filter
Reference Pump
gas Gas
analyzers (atmospheric
(Humidified N2 or atmospheric air) Solenoid ZPB pressure)
Sample valve Solenoid valve
Mist filter Pump
gas
Sample Drain Solenoid
gas pot Demister valve Solenoid valve
Min. Max. Solenoid
valve
Ball valve
Drain Solenoid valve
NO 0 … 50 ppm 0 … 5000 ppm pot Ball valve
Demister
Drain Standard gas Standard gas
SO2 0 … 50 ppm 0 … 5000 ppm Drain potBall valve
Demister for zero for span
calibration calibration
CO2 0 … 50 ppm 0 … 25 vol% Ball valve
Ball valve Standard gas Standard gas
CO 0 … 50 ppm 0 … 5000 ppm Drain Ball valve for zero for span
calibration calibration
O2 0 … 5 vol% 0 … 100 vol% Standard gas Standard gas
Drain for zero for span
The O2 ranges above are for the built-in magnetic analyzer. calibration calibration

Single beam Sample switching 2 components max. NO SO2 CO2 CO O2

Low-concentration
ZPG
█ System configuration example
measurement Gas with high-level moisture (higher than the level that saturation occurs at 2°C)

Membrane
Component eliminator*3 Flowmeter filter
Air filter Pump
Humidifier NO2/NO Gas Exhaust
Reference
gas converter analyzers (atmospheric
Membrane
(N2) (For NOx measurement)
Component eliminator*3 Flowmeter filter ZPG pressure)
Air filter Pump
Mist filter Pump Humidifier
Reference Membrane
NO2/NO Gas Exhaust
Component eliminator*3 Flowmeterconverter filter analyzers (atmospheric
gas
Sample Air filter Pump (For NOx*2measurement) ZPG pressure)
gas (N2)
Reference
Humidifier NO2/NO
O
Gas2 Exhaust
Exhaust
Solenoid analyzer
analyzers (atmospheric
gas Mist filter Pump valve converter
ZFK7 (atmospheric
pressure)
(N2) Solenoid (For NOx measurement) ZPG pressure)
Sample *1 Electronic cooler valve *2
gas Mist filter Pump O2 Exhaust
Solenoid analyzer (atmospheric
Sample Safety drain valve
Drain *2 ZFK7 pressure)
Min. Max. gas trap pot
*1 Electronic Solenoid
cooler
Solenoid O 2 Exhaust
valve analyzer (atmospheric
valve
Ball pressure)
NO 0 … 10 ppm 0 … 100 ppm valve Solenoid
ZFK7
Safety Electronic cooler
*1 drain Drain valve
SO2 0 … 10 ppm 0 … 100 ppm trap potStandard gas Standard gas
for zero for span
Drain
CO2 0 … 5 ppm 0 … 50 ppm Safety drain
trap
Ball calibration calibration
Drain
potvalve
CO 0 … 5 ppm 0 … 50 ppm Notes:
Standard gas Standard gas
Drain1. Use an electronic coolerfortozero
keepforthe
spanmoisture content below the level
Ball
valve
O2 0 … 5 vol% 0 … 100 vol% saturation occurs at 2°C. Make sure thatgas the moisture concentration of the
calibration calibration
Standard gas Standard
The O2 ranges above are for the built-in magnetic analyzer. Drain reference gas and that ofzero
for the sample
for span gas are equal.
Notes: 1. Use an electronic cooler to keep the moisture content below the level
calibration calibration
2. The NO2/NO converter is required for NOx measurement.
saturation occurs at 2°C. Make sure that the moisture concentration of the
3. Use
Notes: 1. The an
component
electroniceliminator
cooler to is usedthe
keep formoisture
eliminating the target component from
reference gas and that of the sample gas arecontent
equal. below the level
the sampleoccurs
gas soatthat
2°C.itisMake
can besure
used asthe
a reference
moisture gas. Use the CO/CO
2.saturation
The NO2/NO converter required forthat
NOx measurement. concentration of the 2
converter gas
(ZDL) in that
CO measurement, andare
theequal.
component eliminator (ZBBB)
3.reference
The component and of theis sample
eliminator used forgas
eliminating the target component from
in NO,
2. The SO 2, and CO2 measurement.
theNO 2/NO
sample converter
gas so thatisitrequired for NOx
can be used as ameasurement.
reference gas. Use the CO/CO2
3. The component eliminator is used for eliminating
converter (ZDL) in CO measurement, the target eliminator
and the component component(ZBBB)
from
the sample
in NO, SO2gas soCO
, and that it can be used as a reference gas. Use the CO/CO2
2 measurement.
converter (ZDL) in CO measurement, and the component eliminator (ZBBB)
4 in NO, SO2, and CO2 measurement.
Specifications
Standard version Drift-less type Low-concentration measurement type
Model ZPA ZPB ZPG
Principle NDIR (single beam) O2: magnetic, galvanic, or external zirconia analyzer
No. of components ≤ 5 (including O2) ≤ 2 (including O2)
Components and ranges Min Max Min Max Min Max
NO 0 … 200 ppm 0 … 5000 ppm 0 … 50 ppm 0 … 5000 ppm 0 … 10 ppm 0 … 100 ppm
SO2 0 … 200 ppm 0 … 10 vol% 0 … 50 ppm 0 … 5000 ppm 0 … 10 ppm 0 … 100 ppm
CO2 0 … 100 ppm 0 … 100 vol% 0 … 50 ppm 0 … 25 vol% 0 … 5 ppm 0 … 50 ppm
CO 0 … 200 ppm 0 … 100 vol% 0 … 50 ppm 0 … 5000 ppm 0 … 5 ppm 0 … 50 ppm
CH4 0 … 500 ppm 0 … 100 vol% – – – –
O2 (built-in galvanic
0 … 10 vol% 0 … 25 vol% 0 … 10 vol% 0 … 25 vol% 0 … 10 vol% 0 … 25 vol%
analyzer)
O2 (built-in magnetic 0 … 5 vol% 0 … 100 vol% 0 … 5 vol% 0 … 100 vol% 0 … 5 vol% 0 … 100 vol%
analyzer) None 100 … 95 vol% – – – –
O2 (external zirconia
0 … 5 vol% 0 … 25 vol% 0 … 5 vol% 0 … 25 vol% 0 … 5 vol% 0 … 25 vol%
analyzer)
No. of ranges Up to 2 ranges per component
Repeatability ±0.5% FS
Linearity ±1% FS
Zero drift ±2% FS per week ±0.5% FS per week
Span drift ±2% FS per week ±2% FS per week
10 s … 30 s ≤ 30 s
Response time (for 90%)
(may vary with measurement range) Dead time varies within 5–20 seconds according to the setting for the sample switching.
Output signal 4–20 mA DC or 0–1 V DC (ZPA and ZPB: ≤ 12 points, ZPG: ≤ 4 points)
Display LED-backlit LCD, instantaneous value, O2 corrected instantaneous value, O2 corrected average value, O2 average
Range switching by key operation, automatic, or remotely (option)
Contact input (option) Voltage input: remote range-switching, auto-calibration remote start, remote hold, average reset
SPDT relay contact:
Contact output (option) analyzer error, calibration error, range identification, during auto-calibration, solenoid valve operation for 
auto-calibration, H/L limit alarm, CO peak alarm
Atmospheric pressure
Built-in option available
correction (option)
Standard functions Output hold, auto/manual range switching
Auto calibration, auto calibration remote start, remote hold of output, range identification contact output, H/L limit
Optional functions
alarm, O2 correction, O2-corrected average values, average resetting contact input, CO peak alarm contact output
Communication (option) RS-485 (Modbus)
Sample gas flow checker None Provided
Gas inlet/outlet Rc¼ or NPT¼ internal thread
Purge gas flow rate 1 L/min (as needed)
Reference gas Not required Required (dry N2 or dry air)
Operating environment -20°C … +60°C, RH 90% or lower (no condensation)
Mounting 19-inch rack mounting
Power supply voltage 100–240 V AC, 50/60 Hz
Power consumption Approx. 100 VA Approx. 120 VA Approx. 100 VA
Dimensions 483 (W) × 133 (H) × 382 (D) mm
Weight Approx. 11 kg Approx. 13 kg Approx. 11 kg

Dimensions
Unit: mm
Front Side
Power switch Flowmeter (for ZPB and ZPG)
7

124.5
132.5
57.2

25
415 2
24 380 16
463 396
483
AC power socket type M4 terminal block type

Rear
Digital input/output connector (DIO1, 2, 3) *ZPG has DIO1 and DIO2 only.
Analog output connector (AO)
Purge gas inlet: Rc ¼ or NPT ¼
Communication connector (RS-485)
Sample gas inlet: Rc ¼ or NPT ¼
Analog input connector (AI)
Sample gas and reference gas outlet: Rc ¼ or NPT ¼
Reference gas inlet: Rc ¼ or NPT ¼ (for ZPB and ZPG)
AC power socket Power supply terminal block (M4)
Fuse P N L

100–240 V AC
50/60Hz
429

5
 Ordering code
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
 ZPA
Z PA B 2— — —
Digit Specifications Note Code Digit Specifications Note Code Digit Specifications Note Code
4 Design / Power Connector 11 (NDIR) 2nd component 1st range Note 4 □ 21 O2-Correction Note 6
Horizontal, with power terminal block A 12 (NDIR) 2nd component 2nd range Note 4 □ None Y
13 (NDIR) 3rd component 1st range Note 4 □
Horizontal, with AC power socket Note 1 D O2-corrected concentration A
14 (NDIR) 3rd component 2nd range Note 4 □
5 Installation 15 (NDIR) 4th component 1st range Note 4 □ O2-corrected average concentration B
19-inch rack mounting (EIA-compliant) B 16 (NDIR) 4th component 2nd range Note 4 □ O2-corrected concentration +
C
6 Component (NDIR) 17 O2 Range Note 4 O2-corrected average concentration
1st 2nd 3rd 4th None Y 22 Option (DIO) Note 7
Auto Range ID,
– – – – Note 2 Y 0 … 5 / 0 … 10 vol% A FAULT calibration H/L alarm Remote
NO – – – P 0 … 5 / 0 … 25 vol% B range
SO2 – – – A 0 … 10 / 0 … 25 vol% C None Y
CO2 – – – D 0 … 5 vol% L ○ A
CO – – – B 0 … 10 vol% M ○ ○ B
CH4 – – – E 0 … 25 vol% V ○ ○ C
NO SO2 – – F 0 … 50 vol% P ○ ○ D
NO CO – – G 0 … 100 vol% R ○ ○ ○ E
CO2 CO – – J 100 … 95 vol% S ○ ○ ○ F
CH4 CO – – K Others Z ○ ○ ○ G
CO2 CH4 – – L 18 Gas Inlet/Outlet ○ ○ ○ ○ H
NO SO2 CO – N Rc¼ 1 23 Atmospheric Pressure Correction
CO2 CO CH4 – T NPT¼ 2 None Y
NO SO2 CO2 CO V 19 Output Provided 1
Others Z 0–1 V DC A 24 Unit
7 O2 Sensor Note 3 4–20 mA DC B ppm, vol% A
None Y 0–1 V DC + Communication C mg/m3, g/m3 Note 8 B
External O2 analyzer 1 4–20 mA DC + Communication D 25 Adjustment Note 9
Zirconia O2 analyzer (ZFK7) 2 20 Language / Power Cable Note 5 Standard A
Galvanic fuel cell sensor 3 Japanese/Power cable rated 125 V (PSE) J For heat treatment furnaces Note 10 C
Paramagnetic sensor 4 English/Power cable rated 125 V (UL) E For converters D
8 Revision Code 2 English/Power cable rated 250V (CEE) U Others Z
9 (NDIR) 1st component 1st range Note 4 □ Chinese/Power cable rated 250V (CCC) C
10 (NDIR) 1st component 2nd range Note 4 □

NDIR range codes (for ZPA) O2 range codes (for ZPA, ZPB, ZPG)
Measurement range 9th–16th codes Paramagnetic  Zirconia O2
Measurement range 17th code Galvanic fuel cell
None Y sensor analyzer (ZFK7)
0 … 100 ppm B 0 … 5 / 0 … 10 vol% A ◦ Note 11 ◦
0 … 200 ppm C 0 … 5 / 0 … 25 vol% B ◦ Note 11 ◦
0 … 250 ppm D 0 … 10 / 0 … 25 vol% C ◦ ◦ ◦
0 … 300 ppm S 0 … 5 vol% L ◦ Note 11 ◦
0 … 500 ppm E 0 … 10 vol% M ◦ ◦ ◦
0 … 1000 ppm F 0 … 25 vol% V ◦ ◦ ◦
0 … 2000 ppm G 0 … 50 vol% P ◦
0 … 2500 ppm U 0 … 100 vol% R ◦
0 … 3000 ppm T 100 … 95 vol% S (for ZPA only) ◦
0 … 5000 ppm H
0 … 1 vol% J ppm–mg/m3 conversion table
0 … 2 vol% K Range in mg/m3
0 … 3 vol% Q 9th–16th codes Range in ppm
NO SO2 CO
0 … 5 vol% L C 0 … 200 ppm 0 … 260 mg/m3 0 … 570 mg/m3 0 … 250 mg/m3
0 … 10 vol% M D 0 … 250 ppm 0 … 325 mg/m3 0 … 700 mg/m3 0 … 300 mg/m3
0 … 20 vol% N S 0 … 300 ppm 0 … 400 mg/m3 0 … 850 mg/m3 0 … 375 mg/m3
0 … 25 vol% V E 0 … 500 ppm 0 … 650 mg/m3 0 … 1400 mg/m3 0 … 600 mg/m3
0 … 40 vol% W F 0 … 1000 ppm 0 … 1300 mg/m3 0 … 2800 mg/m3 0 … 1250 mg/m3
0 … 50 vol% P G 0 … 2000 ppm 0 … 2600 mg/m3 0 … 5600 mg/m3 0 … 2500 mg/m3
0 … 70 vol% X U 0 … 2500 ppm 0 … 3300 mg/m3 0 … 7100 mg/m3 0 … 3000 mg/m3
0 … 100 vol% R T 0 … 3000 ppm 0 … 4000 mg/m3 0 … 8500 mg/m3 0 … 3750 mg/m3
Others Z H 0 … 5000 ppm 0 … 6600 mg/m3 0 … 14.00 g/m3 0 … 6250 mg/m3

Conversion formula NO (mg/m3) = 1.34 × NO (ppm) SO2 (mg/m3) = 2.86 × SO2 (ppm) CO (mg/m3) = 1.25 × CO (ppm)

Notes: 
1. If you select the 4th code “D”, select the voltage rating for the power cable in the 20th code.
2. If you only use this analyzer only for oxygen measurement, select “Y” in the 6th code.
3. If you use an external O2 analyzer (7th code “1”), set 0–1 V DC linear signals from the external O2 analyzer so that they corresponds to the full scale setting of the analyzer.
Note that the external O2 analyzer (7th code “1”) and the external zirconia O2 sensor ZFK7 (7th code “2”) need to be ordered separately.
4. See the “availability check table” in Data Sheets for the possible combination of measuring components and ranges.
When ordering, use the codes shown in the “NDIR range codes” and the “O2 range codes.”
5. Power cable selection in the 20th code is only for the AC power socket type (4th code “D”). If you selected “A” in the 4th code, make choice of the display language only.
6. O2 correction is provided only for NO, SO2, and CO measurement.
7. The code “H” is unavailable for 5 component analyzer. If you select the 4 component analyzer and the 22th code “H”, the number of H/L alarm outputs is three at maximum.
8. ‌Even if you select “B” in the 24th code, select the range in ppm that is shown in the “NDIR range codes” table. We will set the analyzer after converting the ppm ranges into mg/m3
ranges.
For the converted ranges, see the “ppm-mg/m3 conversion table”.
9. The adjustment is performed with the following gas.
A: Standard adjustment: balance gas N2
C: For heat treatment furnace: CO2 analyzer: 25% CO + 30% H2 + balance N2
CO analyzer: 5% CO2 + 30% H2 + balance N2
CH4 analyzer: 25% CO + 30% H2 + balance N2
D: For converter: balance gas CO and CO2
To order non-standard adjustment, select “Z” and provide us the gas composition data.
10. The 25th code “C” is incompatible with the NDIR range codes “X” and “R”.
11. Incompatible with the NDIR range codes “V”, “W”, “P”, "X”, and “R”.

6
 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
 ZPB
Z PB B 2— — —
Digit Specifications Note Code Digit Specifications Note Code Digit Specifications Note Code
4 Design / Power Connector 13 (NDIR) 3rd component 1st range Note 3 □ 21 O2-Correction Note 5
Horizontal, with power terminal block A 14 (NDIR) 3rd component 2nd range Note 3 □ None Y
15 (NDIR) 4th component 1st range Note 3 □
Horizontal, with AC power socket Note 1 D O2-corrected concentration A
16 (NDIR) 4th component 2nd range Note 3 □
5 Installation O2-corrected average concentration B
17 O2 Range Note 3
19-inch rack mounting (EIA-compliant) B O2-corrected concentration +
None Y C
6 Component (NDIR) O2-corrected average concentration
0 … 5 / 0 … 10 vol% A
1st 2nd 3rd 4th 22 Option (DIO) Note 6
0 … 5 / 0 … 25 vol% B Range ID,
NO – – – P Auto
0 … 10 / 0 … 25 vol% C Fault H/L alarm Remote
calibration
SO2 – – – A range
0 … 5 vol% L
CO2 – – – D None Y
0 … 10 vol% M
CO – – – B ○ A
0 … 25 vol% V
NO SO2 – – F ○ ○ B
0 … 50 vol% P
NO CO – – G ○ ○ C
0 … 100 vol% R
CO2 CO – – J ○ ○ D
Others Z
NO SO2 CO – N ○ ○ ○ E
18 Gas Inlet/Outlet
NO SO2 CO2 CO V ○ ○ ○ F
Rc¼ 1
Others Z ○ ○ ○ G
NPT¼ 2
7 O2 Sensor Note 2 ○ ○ ○ ○ H
19 Output
None Y 23 Atmospheric Pressure Correction
0–1 V DC A
External O2 analyzer 1 None Y
4–20 mA DC B
Zirconia O2 analyzer (ZFK7) 2 Provided 1
0–1 V DC + Communication C
Galvanic fuel cell sensor 3 24 Unit
4–20 mA DC + Communication D
Paramagnetic sensor 4 ppm, vol% A
20 Language / Power Cable Note 4
8 Revision Code 2 mg/m3, g/m3 Note 7 B
Japanese/Power cable rated 125 V (PSE) J
9 (NDIR) 1st component 1st range Note 3 □ 25 Adjustment Note 8
English/Power cable rated 125 V (UL) E
10 (NDIR) 1st component 2nd range Note 3 □ Standard A
11 (NDIR) 2nd component 1st range Note 3 □ English/Power cable rated 250V (CEE) U
Others Z
12 (NDIR) 2nd component 2nd range Note 3 □ Chinese/Power cable rated 250V (CCC) C

4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
 ZPG
Z PG B 2— — —
Digit Specifications Note Code Digit Specifications Note Code Digit Specifications Note Code
4 Design / Power Connector 16 – Y 21 O2-Correction Note 5
Horizontal, with power terminal block A 17 O2 Range Note 3 None Y
Horizontal, with AC power socket Note 1 D None Y O2-corrected concentration A
5 Installation 0 … 5 / 0 … 10 vol% A O2-corrected average concentration B
19-inch rack mounting (EIA-compliant) B 0 … 5 / 0 … 25 vol% B O2-corrected concentration +
C
6 Target (NDIR) 0 … 10 / 0 … 25 vol% C O2-corrected average concentration
22 Option (DIO)
NO P 0 … 5 vol% L
Range ID,
SO2 A 0 … 10 vol% M Auto
Fault
calibration H/L alarm
Remote
CO2 D 0 … 25 vol% V range
CO B 0 … 50 vol% P None Y
Others Z 0 … 100 vol% R ○ A
7 O2 sensor Note 2 Others Z ○ ○ B
None Y 18 Gas Inlet/Outlet ○ ○ C
External O2 analyzer 1 Rc¼ 1 ○ ○ D
Zirconia O2 analyzer (ZFK7) 2 NPT¼ 2 ○ ○ ○ E
Galvanic fuel cell sensor 3 19 Output ○ ○ ○ F
Paramagnetic sensor 4 0–1 V DC A ○ ○ ○ G
8 Revision Code 2 4–20 mA DC B ○ ○ ○ ○ H
9 (NDIR) 1st component 1st range Note 3 □ 0–1 V DC + Communication C 23 Atmospheric Pressure Correction
10 (NDIR) 1st component 2nd range Note 3 □ 4–20 mA DC + Communication D None Y
11 – Y Provided 1
20 Language / Power Cable Note 4
12 – Y 24 Unit
Japanese/Power cable rated 125 V (PSE) J
13 – Y English/Power cable rated 125 V (UL) E ppm, vol% A
14 – Y English/Power cable rated 250V (CEE) U mg/m3, g/m3 Note 7 B
15 – Y Chinese/Power cable rated 250V (CCC) C 25 Adjustment Note 8
Standard A
Others Z
NDIR range codes (for ZPB and ZPG) ppm–mg/m3 conversion table Notes: 
Range Code Range Code Range in mg/m3 1. ‌If you select the 4th code “D”, select the voltage
Code Range in ppm rating for the power cable in the 20th code.
None Y *1 0 … 2000 ppm G NO SO2 CO 2. ‌If you use an external O2 analyzer (7th code “1”),
0 … 5 ppm 5 0 … 2500 ppm U 5 0 … 5 ppm – – 0 … 6.00 mg/m3 set 0–1 V DC linear signals from the external O2
analyzer so that they corresponds to the full scale
0 … 10 ppm 6 0 … 3000 ppm T 6 0 … 10 ppm 0 … 13.0 mg/m3 0 … 28.0 mg/m3 0 … 12.5 mg/m3 setting of the analyzer.
0 … 20 ppm 7 *2 0 … 5000 ppm H 7 0 … 20 ppm 0 … 26.0 mg/m3 0 … 57.0 mg/m3 0 … 25.0 mg/m3 Note that the external O2 analyzer (7th code “1”)
and the external zirconia O2 sensor ZFK7 (7th code
0 … 25 ppm 8 0 … 1 vol% J 8 0 … 25 ppm 0 … 32.5 mg/m3 0 … 70.0 mg/m3 0 … 30.0 mg/m3 “2”) need to be ordered separately.
0 … 30 ppm 9 0 … 2 vol% K 9 0 … 30 ppm 0 … 40.0 mg/m3 0 … 85.0 mg/m3 0 … 37.5 mg/m3 3. ‌See the “availability check table” in Data Sheets
*3 for the possible combination of measuring
0 … 50 ppm A *1 0 … 3 vol% Q A 0 … 50 ppm 0 … 65.0 mg/m3 0 … 140 mg/m3 0 … 60.0 mg/m3 components and ranges. When ordering, use the
0 … 100 ppm B 0 … 5 vol% L B 0 … 100 ppm 0 … 130 mg/m3 0 … 280 mg/m3 0 … 125 mg/m3 codes shown in the “NDIR range codes” and the
“O2 range codes.”
0 … 200 ppm C 0 … 10 vol% M C 0 … 200 ppm 0 … 260 mg/m3 0 … 570 mg/m3 0 … 250 mg/m3 4. ‌Power cable selection in the 20th code is only for
0 … 250 ppm D 0 … 20 vol% N D 0 … 250 ppm 0 … 325 mg/m3 0 … 700 mg/m3 0 … 300 mg/m3 the AC power socket type (4th code “D”). If you
selected “A” in the 4th code, make choice of the
0 … 300 ppm S *3 0 … 25 vol% V S 0 … 300 ppm 0 … 400 mg/m3 0 … 850 mg/m3 0 … 375 mg/m3 display language only.
0 … 500 ppm E Others Z E 0 … 500 ppm 0 … 650 mg/m3 0 … 1400 mg/m3 0 … 600 mg/m3 5. ‌O2 correction is provided only for NO, SO2, and CO
measurement.
0 … 1000 ppm F F 0 … 1000 ppm 0 … 1300 mg/m3 0 … 2800 mg/m3 0 … 1250 mg/m3 6. ‌The code “H” is unavailable for 5 component analyzer.
G 0 … 2000 ppm 0 … 2600 mg/m3 0 … 5600 mg/m3 0 … 2500 mg/m3 If you select the 4 component analyzer and the 22th
*1: For ZPB and ZPG code “H”, the number of H/L alarm outputs is three at
*2: Only for ZPG U 0 … 2500 ppm 0 … 3300 mg/m3 0 … 7100 mg/m3 0 … 3000 mg/m3 maximum.
*3: Only for ZPB T 0 … 3000 ppm 0 … 4000 mg/m3 0 … 8500 mg/m3 0 … 3750 mg/m3 7. ‌Even if you select “B” in the 24th code, select
the range in ppm that is shown in the “NDIR
H 0 … 5000 ppm 0 … 6600 mg/m3 0 … 14.00 g/m3 0 … 6250 mg/m3 range codes” table. We will set the analyzer after
converting the ppm ranges into mg/m3 ranges.
For the converted ranges, see the “ppm-mg/m3
Conversion formula NO (mg/m3) = 1.34 × NO (ppm) SO2 (mg/m3) = 2.86 × SO2 (ppm) CO (mg/m3) = 1.25 × CO (ppm) conversion table”.
8. ‌The standard adjustment (the 25th code “A”) is carried
out using N2 as balance gas. To order non-standard
adjustment, select “Z” in the 25th code and provide us
the gas composition data.

7
 Double-beam

High-performance model ZKJ

5 components max. NO SO2 CO2 CO CH4 N 2O O2

 Zero point drift: ±1.0% FS per week

 Maximum range ratio of 1 : 25
 N2O measurement available
 Hardly affected by interference from other gases
 Calibration, alarm, calculation
 Easy-to-see LCD

Min. Max
NO 0 … 50 ppm 0 … 5000 ppm
SO2 0 … 50 ppm 0 … 10 vol%
CO2 0 … 20 ppm 0 … 100 vol%
CO 0 … 50 ppm 0 … 100 vol%
CH4 0 … 200 ppm 0 … 100 vol%
N2O 0 … 200 ppm 0 … 2000 ppm
O2 0 … 5 vol% 0 … 25 vol% Specifications
NO, SO2, CO2, CO, CH4, N2O: double-beam NDIR
Principle O2 : built-in paramagnetic sensor or external zirconia
Double-Beam NDIR Sensor analyzer
Repeatability ±0.5% FS (±1% FS for the ranges below 50 ppm)
Linearity ±1% FS
The mass flow sensor measures the
Principle
±1% FS per week (±2% FS per week for 50–200 ppm
amount of infrared absorbed in the measurement Zero drift
range)
cell.
±2% FS per week (±2% FS per day for the ranges below
Span drift
Double beam method achieves the range ratio of 1 : 25 50 ppm)
Response time
≤ 60 s
(for 90%)
Distribution cell (also serves as an interference filter) Output signal 4–20 mA DC or 0–1 V DC, up to 12 points
Motor Trimmer Reference cell
Dry contact
External contact
Remote range-switching, auto-calibration remote start,
Rotating input
Detector
P

sector remote hold, average value reset, pump ON/OFF

SPST-NO and SPDT relay contacts
P-ΔP

Interference-
compensation Analyzer error, calibration error, range identification, under 
detector Contact output
Infrared source Sample gas Sample gas auto-calibration, pump ON/OFF, limit alarm
(single) inlet outlet
Measuring cell
CO peak alarm, H/L limit alarm, power interruption
Mass flow sensor
Communication
(separate order RS-232C (Modbus)
Mass flow sensor item)
Air flow
Converts the amount of LED backlit LCD
infrared absorption into Display Instantaneous value, O2-corrected instantaneous value,
electrical signals. Excellent 1 mm O2 corrected average value, O2 average
noise resistance thanks to Power supply
the low impedance sensor. 100–240 V AC, 50/60 Hz
voltage
The absence of moving parts Hot wire mass
makes the device resistant to
air flow sensor Power consump-
250 VA
vibration and semi-permanently usable. tion
Dimensions 483 (W) × 177 (H) × 600 (D) mm
Weight Approx. 22 kg

Information in this catalog is subject to change without notice.

Read the instruction manuals thoroughly before using the products.

www.fujielectric.com

Instrumentation & Sensors Planning Dept.

Gate City Ohsaki, East Tower, 11-2, Osaki 1-chome, Shinagawa-ku, Tokyo 141-0032, Japan
Phone: +81-3-5435-7021 Fax: +81-3-5435-7475
www.fujielectric.com/products/instruments/

Printed in Japan 2018-11/2 FOLS