GASENSOR TECHNOLOGY MODEL GT-CT8900
Description Intelligent Sensor
For Combustible Gas Detection
Model GT-CT8900, Fixed type Catalytic combustible gas
sensor, engineered specifically for detecting combustible
gas (Methane) and vapor. The sensor is housed together
in an explosion-proof enclosure complete with status
display, which consists of three high-brightness nixie tubes
and four status indicators for gas concentration readings
and status conditions. In addition, a sensor life indication
function is provided for ease of maintenance and improves
instrument reliability. GT-CT8900 provides various output
interfaces which includes 4-20mA current output, three sets
of Normally Open Contacts for Warning/Alarm/Fault status,
two sets of communication interfaces for RS485 and HART
interfaces.
Features Benefits
• Compatible with Automatic Remote Gas Calibrator • Fully automatic calibration
(ARGC) • Fault, gas check, calibration, and alarm event logging
• Event logging • Provides complete status and control capability in the control
• HART and Modbus communications room
• 4-20 mA analog current output • Industry standard outputs for remote alarm and fault indication
• Warning, Alarm & Fault Relays • Provides local alarm capability
• Calibration, Calibration Check, and Setup Modes • Simplifies operation and maintenance
• Remaining sensor life indication • Reduces downtime by providing an estimate of sensor life
System Specifications
Sensor Type : Continuous diffusion, Zero Drift : Less than 5% of full scale per year
low temperature catalytic bead Modes : Calibration, gas check, setup
Sensor Life : 3 to 5 years typical Electrical Classification :
Measuring Ranges : 0-100% LEL ATEX II 2G Ex db IIC T6 Gb IP66
Accuracy : ±3% LEL 0- 50% LEL; ±5% LEL; 50-100% LEL (Tamb = -40°C to +70°C)
Response Time : T50 <10 s T90 <30 s with 100% LEL SIL2 Certified
Warranty : Two years
methane applied；(T90 ≤18s Typical Value)
MODEL GT-CT8900
Electrical Specifications Environmental Specifications
Input Power : 24 VDC nominal, 20 to 36 VDC 5W max Operating Temperature
Analog Output : 0-20 mA (650 Ohms max. load) Range : -40°F to 167°F (-40°C to 75°C)
0 mA ① Malfunction Storage Temperature
1.5 mA ② Gas Check/Calibrate Range : -58°F to 185°F (-50°C to 85°C)
1.5 mA ② Setup mode Operating Humidity
4 mA ± .05 mA Zero reading Range : 5% to 100% RH, non-condensing
4-20 mA 0-100% LEL
20-22 mA Over-range
RS-485 Output : Dual redundant Modbus RTU, 207
123
(Optional) suitable for linking up to 128 units or 98
up to 247 units with repeaters
Baud Rate : 2400, 4800, 9600, or 19200 bps
HART: HART 7, HART Device Description Language
(Optional) available. AMSAware
Relay Ratings : 8A @ 250 VAC / 8A @ 30 VDC res. max.
193
98
(Optional) (3x) SPDT - Warning, Alarm & Fault
Status Indicators: Three-digit LED display with gas Accessories
(Order separately)
concentration,FLT,RUN,Warn and Alarm
LED's,calibration prompts, faultcodes,
and setup options
Faults Monitored : Calibration error, sensor error, low DC
supply, EEPROM, setup error, gas check
time exceeded, switch error, internal error
I/O Protection: over-voltage, Miswiring, EMI / RFI Immunity
Cable Requirements: Three-wire shielded cable. Upright column
Max. distance between GT-CT8900 and power Equipped by user
source @ 24 VDC nominal (20-Ohm loop):
14 AWG - 2303 ft (702 m)
Max. distance for analog output (650 Ohms max):
14 AWG - 9000 ft (2740 m)
Mechanical Specifications
Mounting Holes : 3.86 inches (98 mm)
(center to center)
Housing : Marine aluminum
316 Stainless steel (optional)
Weight : 1.8 kg ( Aluminum )
4.3 kg ( Stainless steel ) Figure 1: Outline and Mounting Dimensions
Cable Entries: Two entries 3/4 ins NPT, others optional
① Under HART, current values can be either 3.5 mA or 1.25 mA, depending on user selection.
② Under HART, current value can be either 3.5 mA or 1.5 mA, depending on user selection. Publication #: DS-CT8900-D0718
Specifications subject to change without notice. GT-TD-DS.01
Gasensor Technology Pte.Ltd
Add : 71 Ubi Crescent # 04-01 Excalibur Centre Singapore 408571
Tel : ( +65 ) 67446268 Fax : ( +65 ) 67446269
E-mail : sales @ gasensor.com
Web : WWW . gasensor.com
MODEL GT-CT8900
Ordering Information
GT-CT8900 Combustible Gas Detector
A B C D E
Customized CFG: GT-CT8900
STD CFG: GT-CT8900 -1 -8 -1 -1 -1
A: Sensor Type Description
1 std* SST Sensor Body
2 AL Sensor Body
3 SST Sensor Body, HI TEMP
4 AL Sensor Body , HI TEMP
B: Output Description
1 4-20mA+Relay+ Modbus +Hart
2 4-20mA+ Relay+ Modbus
3 4-20mA+Relay+ Hart
4 4-20mA+ Relay
5 4-20mA+ Relay
6 4-20mA+ Modbus
7 4-20mA+ Hart
8 std* 4-20mA
C: Relay State CFG Description
1 std* WARN dEn nLA, ALRM dEn nLA
2 WARN dEn nLA, ALRM En nLA
3 WARN En nLA, ALRM dEn nLA
4 WARN En nLA, ALRM En nLA
5 WARN dEn nLA, ALRM dEn LA
6 WARN dEn nLA, ALRM En LA
7 WARN En nLA, ALRM dEn LA
8 WARN En nLA, ALRM En LA
Specifications subject to change without notice
Gasensor Technology Pte.Ltd
Add : 71 Ubi Crescent # 04-01 Excalibur Centre Singapore 408571
Tel : ( +65 ) 6744 6268 Fax : ( +65 ) 6744 6269
E-mail : sales @ gasensor.com / gasensor @ gasensor.com
Web : WWW . gasensor.com
MODEL GT-CT8900
Ordering Information
D: Enclosure Description
1 std* AL
2 SST
E: Approvals Description
1 std* ATEX
2 CCCF
3 ATEX+CCCF
Note:
Std* refers to the standard configuration;
Specifications subject to change without notice.
Gasensor Technology Pte.Ltd
Add : 71 Ubi Crescent # 04-01 Excalibur Centre Singapore 408571
Tel : ( +65 ) 6744 、6268 Fax : ( +65 ) 6744 、6269
E-mail : sales @ gasensor.com / gasensor @ gasensor.com
Web : WWW . gasensor.com
