INSTRUCTIONS

Electrochemical H2S Detector

Model C7064E

APPLICATION FEATURES
The C7064E Electrochemical H 2 S Detector provides • Reliable electrochemical sensor delivers excellent
reliable detection and measurement of hydrogen sulfide accuracy, specificity, and is performance-approved.
(H2S) gas concentrations in hazardous industrial areas.
• Robust stainless steel housing is certified explosion-
The detector is designed for use with Det-Tronics
proof and EMI/RFI hardened.
FlexVu® UD10 Universal Display Unit, Model U9500B
Transmitter, R8471B Controller, or other devices capable • Temperature compensated to ensure consistent
of monitoring a 4 to 20 mA dc input. The C7064E is performance over operating temperature range.
FM Approved and CSA Certified for use in hazardous
• Hydrophobic filter provides exceptional sensor
environments.
protection.
• Easily replaced electrochemical sensor cell.
• Easy two-wire installation can be used with or without
a display transmitter.

6.3 ©2020 Detector Electronics Corporation 10/09 95-8396

DESCRIPTION OPTIONAL TRANSMITTERS, CONTROLLER AND
CALIBRATOR
The C7064E detector consists of an explosion-
The C7064E detector's 4 to 20 mA output is calibrated
proof stainless steel enclosure, which houses the
at the factory, but requires an additional transmitter
electrochemical sensor and the transmitter circuitry. The
or controller to perform calibration in the field. For
detector provides a loop-powered 4 to 20 mA output
applications where a local display of detected H 2 S
signal that is proportional to the full scale range of the
gas level is required, the FlexVu ® Model UD10
electrochemical sensor installed in the detector. Three
Universal Display Unit or the Model U9500B200x Infiniti
(3) electrochemical sensors providing 20, 50, and 100
Transmitter is recommended for use with the C7064E.
PPM ranges are offered. The user must ensure that
For applications where a control/display card in a
the 4-20 mA signal receiver is properly scaled to match
mounting rack is required, the Model R8471B Series H2S
the full scale range of the sensor installed within the
controller is recommended for use with the C7064E.
C7064E. The C7064E provides three (3) wires for user
termination: Signal (+), Signal (–), and earth ground.
HYDROPHOBIC FILTER
ELECTROCHEMICAL SENSOR The C7064E uses a hydrophobic filter to protect the
electrochemical sensor from contamination by dirt
The electrochemical sensor uses capillary diffusion
and moisture. The hydrophobic filter can be replaced
barrier technology for detecting the presence of
quickly and conveniently in the field if damaged or
hydrogen sulfide gas. The sensor provides improved
fouled. Removal of the filter is not necessary to perform
accuracy, reliability, and extended calibration intervals
calibration.
when compared to ordinary solid state type sensors.

The response of the sensor is highly specific to H2S.

Most commonly encountered gases have little if any
cross sensitivity effect. Table 1 shows the response
of a typical electrochemical H2S sensor (0 to 100 ppm
range) when exposed to 100 ppm concentrations of
various commonly encountered substances.

Sensor Output
The 4 to 20 mA dc drive circuitry is rated at a maximum
600 ohms loop resistance with 24 Vdc supply voltage.

Table 1—Cross Sensitivity of Electrochemical Sensor

to 100 ppm Concentrations

O ppm <1 ppm <20 ppm <10 ppm –20 ppm

HCN NO SO2 CO Cl2
C2H4 HCl H2 NO2

NOTE: Values shown are for a typical 0 to 100 ppm sensor.

Response of 0 to 20 ppm and 0 to 50 ppm sensor
will be proportionately lower.

6.3 2 95-8396
SPECIFICATIONS CERTIFICATION—
FM: Model C7064E5014:
GAS MEASUREMENT RANGE— Class I, Div. 1, Groups B, C & D.
0 to 20, 50, or 100 ppm H 2 S depending upon the
Model C7064E4012 and C7064E5012:
005434-xxx electrochemical sensor specified.
Class I, Div. 1, Groups C & D.
OUTPUT SIGNAL—
Two-wire, loop-powered 4 to 20 mA analog signal at 600 CSA: Model C7064E5014:
ohms maximum resistance with 24 Vdc applied. Class I, Div. 1, Groups B, C & D;
Class I, Div. 2, Groups A, B, C & D (T4A).
POWER CONSUMPTION RANGE— C7064E Series:
0.25 to 0.8 watts maximum. Class I, Div. 1, Groups C & D;
Class I, Div. 2, Groups A, B, C & D (T4A).
VOLTAGE REQUIREMENTS—
12-32 Vdc, 24 Vdc recommended. IEC: Ex d IIB +H2 T4.
SIRA Ex 02Y1010X.
MAXIMUM LOOP RESISTANCE— Tamb: –40°C to +75°C.
300 ohms @ 18 Vdc, 600 ohms @ 24 Vdc, 1000 ohms @ IP54.
32 Vdc.
WARNING
TEMPERATURE RANGE— Ensure that the sensor hazardous (classified)
Operating: –40°F to +122°F (–40°C to +50°C). location rating is applicable for the intended
Storage: +32°F to +68°F (0°C to +20°C). use.

NOTE ENCLOSURE MATERIAL—

The C70 6 4E has successfully completed 316 stainless steel.
Hazardous Location testing from –40°C to +75°C;
however, the label will indicate –40°C to +50°C. DIMENSIONS—
See Figure 1.
HUMIDITY RANGE—
Operating: 15 to 90% RH, non-condensing. SHIPPING WEIGHT (APPROXIMATE)—
Storage: 15 to 90% RH, non-condensing. Detector housing: 2.5 pounds (1.1 kilograms),
Sensor: 0.2 pound (0.1 kilogram).
ACCURACY—
±10 percent of applied gas concentration or ±3 ppm, WARRANTY—
whichever is greater. Two years from date of manufacture. Typical service
life is 3-5 years depending upon ambient environmental
RESPONSE TIME— conditions.
T20 in ≤ 12 seconds,
T50 in ≤ 30 seconds,
T90 in ≤ 60 seconds.
4.05
(10.3)
STABILITY—
Zero: < 1 PPM / month,
Span: < 1 % FS / month.
1.75
(4.5)

2.0 3/4 INCH

A1347 (5.0) STANDARD PIPE THREAD

Figure 1—Sensor Dimensions in Inches (Centimeters)

6.3 3 95-8396
INSTALLATION 5. The detector should be located where it is safe from
potential sources of contamination.
CAUTION
The electrochemical sensor contains 6. To prevent the buildup of contaminants on the filter,
semiconductor devices that are sensitive the detector should never be installed with the
to electrostatic discharge. Damage caused opening pointed straight up.
by electrostatic discharge can be virtually
eliminated if the equipment is handled only 7. The detector must be accessible for testing and
in a static safeguarded work area and if it is calibration.
transported in a package that will provide the
necessary protection against static electricity 8. Exposure to excessive heat or vibration can cause
(such as the original factory packaging). Since premature failure of electronic devices, and should
a static safeguarded work area is usually be avoided if possible. Shielding the device from
impractical in most field installations, handle the intense sunlight will reduce solar heating and can
device by the housing, taking care not to touch increase the life of the unit.
electronic components or terminals.
WIRING REQUIREMENTS
DETECTOR POSITIONING
Two or three wire, shielded cable is recommended
Proper detector location is essential for providing for connecting the C7064E detector to a transmitter,
maximum protection. The most effective number controller or other analog input device. Note that the
and placement of detectors varies depending on the third conductor from the C7064E is an earth ground
conditions at the job site. The individual designing the conductor that is normally terminated at the junction
system must rely on experience and common sense to box earth ground lug. The use of shielded cable will
determine the number of detectors needed and the best help protect against interference caused be extraneous
locations to adequately protect the area. The following electrical "noise." In applications where the detector
factors are important and should be considered for cable is installed in conduit, the conduit should not be
every installation: used for wiring to other electrical equipment whenever
possible. If other equipment power wiring is run in the
1. Since hydrogen sulfide is a highly toxic gas, a same conduit, the detector cabling must be shielded.
primary consideration in determining optimum The maximum allowable distance between the detector
detector locations is to identify where people are and signal receiver is limited by the resistance of the
most likely to first come into contact with the toxic cabling used. Table 2 shows the maximum cabling
gas. This contact point is typically a prime location distance allowed for a given wire size with 24 Vdc
for an H2S gas detector. supplied. If an additional signal conditioning or relay
output transmitter is being used along with the C7064E
2. Factors such as vapor density should also be detector, refer to the specific transmitter manual for
considered when determining detector locations. detailed wiring instructions.
Hydrogen sulfide is slightly heavier than clean air,
and therefore may tend to settle near the floor or
ground, unless it is heated, mixed with other gases Table 2—Maximum Wiring Distances-
C7064E Detector to Controller/Transmitter
that are lighter than air, or prevented from doing so
by ambient air movement patterns.
Maximum Distance
3. How rapidly will the H2S gas diffuse into the air? Wire Size C7064E Detector
Select a location for the detector as close as (AWG) to Controller
practical to an anticipated source. Feet Meters
18 5700 1750
4. Ventilation characteristics of the immediate area
16 9000 2800
must also be considered. Air movement may cause
the gas to accumulate more heavily in one area than
another. Detectors should be placed where the
most concentrated accumulation of hydrogen sulfide
gas is anticipated. Also consider the fact that some
ventilation systems do not operate continuously,
and therefore areas with poor circulation should be
evaluated for toxic gas accumulation.

6.3 4 95-8396
DETECTOR INSTALLATION AND WIRING NOTE
Some C7064E models are furnished with the
1. Determine the best mounting locations for the
red and black wires connected to a four-position
detectors. Whenever possible, mount the detector
plug. When wiring the C7064E to a transmitter
with the filter pointing down to minimize exposure to
or junction box using screw terminals, cut off the
contamination.
plug and strip the wires back approximately 1/4
inch (6 cm).
2. The C7064 detector junction box (or housing of
associated transmitter) is intended for flat-surface
3. Install the C7064 detector within the proper opening
mounting, such as on a wall or post. A junction
in the junction box. Terminate all three (3) C7064
box spacer or stand-off (1/4 to 1/2 inch) may be
conductors at the proper terminals. Refer to the
needed to allow adequate clearance for the detector
appropriate illustration for details:
and calibration cup. The junction box should be
electrically connected to earth ground.
Figure 2 — Typical C7064E stand-alone detector.
NOTE Figures 3 & 4 — C7064E wired to UD10 Display
Coat the junction box cover and detector threads Unit.
with an appropriate grease to ease installation
and future removal. The recommended Figures 5 & 6 — C7064E wired to U9500 Infiniti
lubricant is a silicone free grease, par t Transmitter.
number 005003‑001, available from Detector
Electronics. Figure 7 — C7064E wired to R8471B Controller.

NOTE
The 005434-xxx electrochemical H 2S sensor
does not need to be installed within the C7064E
housing while installing and wiring the detector/ SEALING COMPOUIND
junction box. It is recommended to keep
the sensor within the manufacturer’s sealed
shipping bag in a cool storage environment until
actual power-up and calibration commissioning
is performed. This will ensure that the sensor +
will provide maximum longevity. +
–
FIBER FILLER
G
–

WIRING TO CONTROLLER
RED = +
BLK = –
SHIELD = GRN

CONNECT GREEN SENSOR WIRE

TO GROUND LUG

SENSOR
RED = +
BLK = –
GRN = NO CONNECTION

GROUND JUNCTION BOX

ACCORDING TO LOCAL CODES

A2312

Figure 2—A Typical C7064E Stand-Alone Detector

6.3 5 95-8396
 BLACK

RED

GREEN
UD10 Sensor Connector
DISPLAY UNIT

J3-1

J3-2

J3-3

J3-4

J3-5
J3

CALIBRATE

24 VDC –
SHIELD

24 VDC +
4-20 mA
Output Loop SEE NOTE 1
Connector
HIGH ALARM COM J4-1
P1-3 4-20 mA +
HIGH ALARM NC J4-2

P1-2 4-20 mA – HIGH ALARM NO J4-3

AUX ALARM COM J4-4

Relay Connector
P1-1 SHIELD
AUX ALARM NC J4-5
C706X SENSOR
P1
AUX ALARM NO J4-6

LOW ALARM COM J4-7

J2
LOW ALARM NC J4-8
J2-3 COM
LOW ALARM NO J4-9
J2-2 RS485 A FAULT COM J4-10

FAULT NC J4-11
J2-1 RS485 B
FAULT NO J4-12

24 VDC –
24 VDC –

24 VDC +
24 VDC +
MODBUS
SHIELD

SHIELD
J4
Connector

NOTE 1 CONNECT THE GREEN SENSOR LEAD

P2-6

P2-5

P2-4

P2-3

P2-2

P2-1
P2
TO THE CHASSIS GROUND LUG ON THE
INSIDE BOTTOM OF THE DISPLAY ENCLOSURE.
Power Supply Connector
NOTE 2 UD10 HOUSING MUST BE ELECTRICALLY
C2422 CONNECTED TO EARTH GROUND.

Figure 3—C7064E Sensor Wired Directly to a UD10 Universal Display Unit

BLACK
SEE NOTE 1
RED

UD10 DISPLAY UNIT

Sensor Connector SENSOR
TERMINATION
J3-1

J3-2

J3-3

J3-4

J3-5

J3 BOX
CALIBRATE

24 VDC –
SHIELD

24 VDC +
4-20 mA

Output Loop
Connector
HIGH ALARM COM J4-1 +
P1-3 4-20 mA + –
HIGH ALARM NC J4-2 G
D
HIGH ALARM NO J4-3 RE
P1-2 4-20 mA – + BLK
AUX ALARM COM J4-4 –
Relay Connector

P1-1 SHIELD G
AUX ALARM NC J4-5
P1
AUX ALARM NO J4-6

LOW ALARM COM J4-7

J2
LOW ALARM NC J4-8 GROUND LUG*
J2-3 COM
LOW ALARM NO J4-9
J2-2 RS485 A FAULT COM J4-10 * CONNECT THE GREEN
SENSOR LEAD TO THE
FAULT NC J4-11
J2-1 RS485 B CHASSIS GROUND LUG
FAULT NO J4-12
IN THE INSIDE BOTTOM
24 VDC –
24 VDC –

24 VDC +
24 VDC +

MODBUS
SHIELD

SHIELD

J4 OF THE JUNCTION BOX.

Connector

C706X SENSOR
P2-6

P2-5

P2-4

P2-3

P2-2

P2-1

P2

Power Supply Connector

NOTE 1 GROUND THE SHIELD AT THE DISPLAY
UNIT END ONLY.

NOTE 2 HOUSINGS MUST BE ELECTRICALLY

C2423
CONNECTED TO EARTH GROUND.

Figure 4—C7064E Sensor Wired to a UD10 Universal Display Unit through STB Termination Box

6.3 6 95-8396
 FAULT RELAY CONTACTS
SEE NOTES 2, 3

HIGH RELAY
NC COM NO
NO COM NC
FLT RELAY
HIGH ALARM RELAY CONTACTS
EXTERNAL SEE NOTES 2, 4
RESET

LOW RELAY
NC COM NO
S
SEE NOTE 6

POWER
LOW ALARM RELAY CONTACTS

–
S
SEE NOTES 2, 4, 5

POWER
–

+
+24 VDC

RESET
+

NC COM NO
AUX RELAY
AUXILIARY ALARM RELAY CONTACTS

CAL
PW
+

RED
OUT
SEE NOTES 2, 4, 5
– + BLACK

IN
–
GREEN
4 TO 20 MA SEE NOTE 1
NOTE 1 CONNECT THE GREEN SENSOR LEAD TO THE CHASSIS GROUND LUG
ON THE INSIDE BOTTOM OF THE INFINITI ENCLOSURE.

NOTE 2 ALL RELAY CONTACT DESIGNATIONS INDICATE RELAY STATE

WITH NO POWER APPLIED — RELAYS DE-ENERGIZED.
SENSOR
NOTE 3 WITH POWER APPLIED AND NO FAULTS DETECTED,
THE FAULT RELAY IS NORMALLY ENERGIZED.

NOTE 4 ALARM RELAYS ARE PROGRAMMABLE AS A GROUP

TO BE EITHER NORMALLY ENERGIZED OR NORMALLY DE-ENERGIZED
WITH NO ALARMS DETECTED. REFER TO THE "SET-UP"SECTION OF THIS MANUAL.

B1669 NOTE 5 LOW AND AUXILIARY ALARM RELAYS ARE PROGRAMMABLE

AS A GROUP TO BE LATCHING OR NON-LATCHING.

NOTE 6 THESE TERMINALS ARE CONNECTED INTERNALLY.

Figure 5—C7064E Detector Directly Wired to a U9500 Infiniti Transmitter

INFINITI TRANSMITTER JUNCTION BOX

FAULT RELAY
NO COM NC

LOW RELAY HIGH RELAY

NO COM NC NO COM NC NO COM NC
GROUND SCREW
S

POWER
– +
S

–
POWER

+24 VDC
– + + –

RESET

POWER SUPPLY
+
AUX RELAY
CAL IN
PW
OUT

– +

4 TO 20 MILLIAMPERES

TWO CONDUCTOR
SEPARATION KIT JUNCTION BOX SHIELDED CABLE
(CONNECT AT THE
TRANSMITTER
JUNCTION BOX ONLY)

+
–
G
D * CONNECT THE GREEN
RE
+ BLK SENSOR LEAD TO THE
– CHASSIS GROUND LUG
IN THE INSIDE BOTTOM
G OF THE JUNCTION BOX.

NO CONNECTION
GROUND LUG*

C7064E DETECTOR

A2313

Figure 6—C7064E Detector Wired to a U9500 Infiniti Transmitter

Using a Separation Kit Junction Box

6.3 7 95-8396
 R8471B CONTROLLER

– 1
+ –
CURRENT OUTPUT
+ 2 4 TO 20 MA

CHASSIS GROUND 3

+ 4 +
POWER 18 TO 32
VDC 24 VDC
– 5 –
RED
POWER + 6
SENSOR
BLK GREEN*
SIGNAL – 7

EXTERNAL RESET 8
RESET
HIGH ALARM 9

HIGH C7064E
HIGH ALARM / OC 10
ALARM
AUX. ALARM 11 * CONNECT THE GREEN
SENSOR LEAD TO THE
AUX. ALARM / OC 12 AUXILIARY CHASSIS GROUND LUG
ALARM IN THE INSIDE BOTTOM
OF THE JUNCTION BOX.
LOW ALARM 13

LOW ALARM / OC LOW

14
ALARM
FAULT 15

FAULT / OC 16 FAULT
B1427

Figure 7—C7064E Detector Wired to an R8471B Controller

4. Confirm that the power and signal cabling for 7. Remove the sensor assembly from its packaging.
the detector is the proper size and type, and is Determine proper orientation for the assembly, then
appropriate for the application requirements. After carefully plug it into the detector housing.
all electrical connections are made, double check
the terminations against the wiring diagrams to NOTE
ensure that all connections are properly terminated. Handle the sensor assembly carefully. To
avoid possible damage, observe the normally
5. The C7064E is designed to operate with an input accepted procedures for handling electrostatic
voltage from 12 to 32 Vdc. Before proceeding sensitive devices.
with complete system commissioning, measure the
delivered voltage at the C7064E detector to ensure 8. Replace the cap back on the detector housing.
that possible voltage drops have not compromised Ensure that the cap O-ring is present and in good
the necessary supply voltage. condition. Tighten the cap only until snug. Do not
over tighten.
NOTE
Do not apply power to the system with the 9. After confirming that the sensor is installed within
junction box cover removed unless the area has the detector housing, all electrical terminations are
been de-classified. properly made, proper operating voltage is provided
to the detector, and all field cabling is appropriate
6. After confirming that all connections are properly for the application requirements, the installer may
terminated and other installation requirements such conduct the startup procedure.
as conduit seals are installed as required, the sensor
may be installed within the C7064E detector. Begin
by removing the cap from the detector housing.
Refer to Figure 8.

6.3 8 95-8396
 DETECTOR HOUSING

H2S SENSOR*

CAP

FIELD REPLACEABLE
HYDROPHOBIC FILTER
* THE ELECTROCHEMICAL SENSOR HAS A
HYDROPHOBIC FILTER THAT IS NOT REPLACEABLE.
DO NOT REMOVE THIS FILTER. DOING SO WILL
DAMAGE THE SENSOR AND VOID THE WARRANTY.

A2496

Figure 8—C7064E Detector

STARTUP PROCEDURE 3. Allow the detector to operate for about 24 hours prior
to an initial calibration, then perform the “Calibration
1. Ensure that any output loads actuated by the Procedure" as described in the following section. It
detection system are bypassed to prevent accidental may be necessary to refer to other transmitter and/
or unnecessary activation of these devices if or controller manuals to complete C7064E detector
required. calibration.

2. Apply power to the system. If the C7064E is used 4. Complete any additional startup/commissioning
in a stand-alone configuration, verify that a nominal requirements as described in the controller/
4 mA output signal is generated by the detector. transmitter manual if utilized.
If the C7064E is used with the U9500B Infiniti,
verify that both "warm-up" and "toxic" messages 5. Place the system in normal operation.
are displayed on the LCD readout, and that after
warmup is complete, a nominal 0 ppm indication
is displayed. If the C7064E is used with a UD10,
ensure that the appropriate operating mode is
selected by following the procedure described in
the Startup section of the UD10 manual.

6.3 9 95-8396
CALIBRATION CALIBRATION GAS
The detector must be calibrated using hydrogen sulfide
FREQUENCY OF CALIBRATION mixed with either air or nitrogen. For best results,
calibration should be performed using a calibration gas
The C7064E detector is typically utilized to protect
concentration equal to mid-point of the electrochemical
human life. For this reason, a frequent calibration
sensor's specific measurement range. This is typically
inspection is recommended. The specific frequency
either 50, 25, or 10 ppm H2S concentrations, and all are
required in different applications can vary depending
available within a complete H2S calibration kit available
upon the amount of background gas, concentration of
from Detector Electronics. Each kit provides the proper
exposed H2S, and ambient environmental conditions.
compressed gas, 1 LPM regulator, hose, and special
calibration cup for the C7064E detector.
Calibration must be performed:
— When a new system is initially put into service. If background H2S gas is present, it may be necessary
— When the electrochemical sensor or C7064E to purge the detector with clean air to ensure that an
detector housing is replaced. accurate zero or “clean air” condition is present prior to
— If a transmitter, controller or other device used in initiating calibration.
conjunction with the C7064E detector is replaced.
— When the hydrophobic filter is cleaned or replaced. CALIBRATION PROCEDURE
The C7064E detector requires a two-step calibration
The following calibration schedule is recommended
process similar to other two-wire gas detectors, but
when placing a new sensor into operation and will
does not provide field access to the on-board
ensure reliable operation in most applications:
zero or span potentiometers. Therefore, it is highly
1. 24 hours after initial power-up recommended that a Model UD10 Universal Display
2. One week later Unit, Model U9500B Transmitter, or Model R8471B
3. Every 30 days thereafter, or as determined by the Controller be utilized with the C7064E to enable non-
needs of the specific application. intrusive field calibration. (Refer to the UD10, U9500B
or R8471B instruction manual for calibration information.)
IMPORTANT
To ensure adequate protection, the H 2 S Some control systems provide calibration capability by
detection system must be calibrated on a allowing the system alarm output threshold levels to be
regularly scheduled basis. adjusted up or down as necessary to match C7064E
span output level deviation (if present) from optimum
condition (typically 12 mA detector output level is
generated in response to 50% full scale calibration gas
exposure). While this method does not actually adjust
detector zero or span levels, it ensures that the output
actions occur at a verified gas concentration condition.

6.3 10 95-8396
MAINTENANCE HYDROPHOBIC FILTER
A dirty filter can significantly reduce the amount of H2S
The C7064E detector is an industrial-grade device
gas that is able to reach the sensor, thereby impairing
suitable for a wide variety of challenging environmental
the ability of the system to respond to a hazardous
conditions. However, a routine maintenance schedule
condition. If the filter becomes dirty and cannot be
is recommended to ensure that the detector is in
properly cleaned or if it is damaged, it must be replaced.
peak operating condition at all times. To ensure top
Do not use solvents to clean the filter. To replace the
performance, service the device as follows.
hydrophobic filter, simply unscrew the existing filter from
the housing, then replace it with a new filter. Use care
VISUAL INSPECTION not to over tighten.
A visual inspection of the detector approximately once
NOTE
per week is recommended to ensure that physical
If the detector cannot be calibrated or responds
obstructions such as trash, debris, mud, snow, or oil
slowly to the calibration gas, check the condition
have not blocked or impeded hazardous gas access
of the hydrophobic filter before replacing the
to the sensor. This includes visually inspecting the
sensor assembly. The hydrophobic filter should
hydrophobic filter on the detector nosepiece.
be clean and squarely seated in the housing.

RESPONSE TEST
ELECTROCHEMICAL SENSOR REPLACEMENT
It is acceptable to perform a detector response
The electrochemical sensor is not field repairable.
verification test in lieu of a complete calibration if the
If calibration can no longer be properly performed,
detector output in clean air appears stable and the
the sensor must be replaced. The area must be
device has been calibrated recently. This test involves
de-classified or power to the detector should be
simply applying calibration gas to the detector while in
removed prior to replacing the sensor in a hazardous
normal operating mode and confirming that the detector
area.
output is proportional to the applied gas concentration.
It is the operator’s responsibility to bypass any and
To replace the sensor in the C7064E Detector:
all system alarm output devices, if necessary, prior to
conducting the detector response test. If the response
1. Remove power from the detector.
test results are not acceptable, then a complete
calibration must be performed.
2. Remove the cap from the detector housing. See
Figure 8. (There is no need to remove the detector
CALIBRATION housing from the junction box.)
As mentioned earlier, the recommended Calibration
3. Remove the old sensor. Check for corrosion or
frequency for the C7064E is as follows:
contamination on the terminals inside the detector
housing. Clean if necessary.
• 24 hours after initial power-up
• One week later 4. Determine proper orientation for the new sensor,
then carefully plug it in.
• Every 30 days thereafter, or as determined by the
needs of the specific application.
NOTE
Handle the sensor carefully. To avoid possible
damage, obser ve the normally accepted
procedures for handling electrostatic sensitive
devices.

6.3 11 95-8396
5. Place the cap back on the detector housing. DEVICE REPAIR AND RETURN
Tighten only until snug. Do not over-tighten.
Prior to returning devices, contact the nearest local
6. Re-apply power. Detector Electronics office so that a Service Order
number can be assigned. A written statement describing
7. Allow time for the sensor to warm up (approximately the malfunction must accompany the returned device or
24 hours for best results), then calibrate. component to expedite finding the cause of the failure.

An adequate supply of spare sensors should be kept Pack the unit properly. Use sufficient packing material
on hand for field replacement. For maximum protection in addition to an antistatic bag or aluminum-backed
against contamination and deterioration, they should not cardboard as protection from electrostatic discharge.
be removed from the original protective packaging until
the time of installation. To ensure maximum storage life, Return all equipment transportation prepaid to the
sensors should be stored at a temperature between 32°F factory in Minneapolis.
and 68°F (0 to 20°C) and a relative humidity between 15
and 90 percent. Always calibrate after replacing the
sensor or detector housing. ASSISTANCE
NOTE For additional information or for assistance in ordering
The sensor contains an acid that occasionally a system to fit your application, please contact:
can leak. If leakage should occur, handle
the sensor carefully to prevent any acid from Detector Electronics Corporation
contacting the skin. If acid should come in 6901 West 110th Street
contact with the skin, wash the affected area Minneapolis, Minnesota 55438 USA
thoroughly with soap and water. Never attempt Operator: +1 (952) 941-5665 or +1 (800) 765-FIRE
to open the sensor. Customer Service: +1 (952) 946-6491
Fax: (952) 829-8750
Web site: www.det-tronics.com
E-mail: det-tronics@carrier.com

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Det-Tronics manufacturing system is certified to ISO 9001—
the world’s most recognized quality management standard. ­Corporate Office Phone: +1 952.941.6665
6901 West 110th Street Toll-free: +1 800.765.3473
Minneapolis, MN 55438 USA Fax: 952.829.8750
95-8396 www.det-tronics.com det-tronics@carrier.com