Det-Tronics GT3000 Series User manual

Instructions
Electrochemical Gas Detector
GT3000 Series
Includes Transmitter (GTX)
and Sensor Module (GTS)
12.4 Rev: Oct 2020 95-8616

DESCRIPTION..............................1
GTS Sensor Module ......................1
GTX Transmitter ..........................2
Real Time Clock ..........................2
History/Event Logs........................2
HART Communication .....................3
Magnetic Switch..........................3
LEDs ..................................3
SPECIFICATIONS ...........................4
IMPORTANT SAFETY NOTES..................5
INSTALLATION..............................6
Identication of Vapor(s) to be Detected .......6
Identication of Detector Mounting Locations ...6
Device Mounting Orientation ................6
Detector Installation .......................7
Sensor Termination Box ....................7
WIRING ...................................7
Power Supply Requirements ................7
Wiring Cable Requirements .................7
Intrinsic Safety Barriers ....................8
Guidelines for Intrinsic Safety Wiring ..........8
Wiring Procedure .........................8
CALIBRATION .............................12
GT3000 Calibration ......................12
Calibration Procedure.....................13
MAINTENANCE ............................14
Routine Inspection .......................14
Sensor Module Replacement...............14
DEVICE REPAIR AND RETURN ...............15
ORDERING INFORMATION ..................15
GTS Gas Sensors .......................15
Calibration Kits for Gas Sensors ............15
Parts & Accessories ......................15
APPENDIX A — FM APPROVAL DESCRIPTION .....18
APPENDIX B — CSA CERTIFICATION DESCRIPTION . 20
APPENDIX C — IECExAPPROVAL DESCRIPTION ..21
APPENDIX D — OTHER APPROVALS .............22
APPENDIX E — SENSOR COMPARISON /
CROSS SENSITIVITY ............24
APPENDIX F — HART COMMUNICATION..........26
APPENDIX G — CONTROL DRAWINGS ...........28
Table of Contents

INSTRUCTIONS
Electrochemical Gas Detector
GT3000 Series
Includes Transmitter (GTX)
and Sensor Module (GTS)
12.4 95-8616
©2021Carrier. All Rights Reserved.
Last Manual Update: Oct 2020
IM PORTANT
Be sure to read and understand the entire
instruction manual before installing or operating
the gas detection system. This product is
intended to provide early warning of the presence
of a toxic or explosive gas mixture, or of oxygen
depletion. Proper device installation, operation,
and maintenance are required to ensure safe
and effective operation. If this equipment is used
in a manner not specied in this manual, safety
protection may be impaired.
DESCRIPTION
The GT3000 Electrochemical Gas Detector is an
intelligent stand-alone industrial gas detector, designed
to provide continuous monitoring of the atmosphere
for hazardous gas leaks or oxygen depletion. Refer to
Appendix E for individual gas specifications.
The GT3000 Gas Detector consists of a replaceable
sensor module (Model GTS) connected to a
transmitter module (Model GTX). A single transmitter
is compatible with all GTS sensor modules. A variety of
electrochemical sensor models are available in various
concentration ranges.
The GT3000 is a 2-wire device that generates a 4–20
mA output signal with HART communication that is
proportional to the concentration of the target gas.
The GT3000 is compatible with FlexVu®Model UD10,
UD20 and UD30 Universal Display Units, as well as
other devices that are able to monitor a linear 4–20
mA dc signal. All alarm functions are provided by the
monitoring device.
The GT3000 is designed and approved as a stand
alone unit for use in hazardous locations. It is suitable
for outdoor applications that require IP66 rating and
uses a hydrophobic filter that is easily replaced without
opening the device or use of tools. The GT3000 is
available as either explosion-proof or intrinsically safe.
The GT3000 supports local one-person calibration
with the use of a magnet and on-board LED.
GTS SENSOR MODULE
The GTS’s electrochemical sensor cell uses capillary
diffusion barrier technology for monitoring gas
concentrations in ambient air.
Live Maintenance
The hot swappable GTS sensor module is intrinsically
safe and allows live maintenance while under power,
without de-classifying the hazardous area. When the
sensor is removed, the transmitter generates a fault
output. If a new sensor of the same type and range is
installed, the fault self-clears. However, if the type or
range of the new sensor module does not match the
old, the transmitter generates a fault until a successful
calibration or acceptance of the new sensor type is
completed. For additional information regarding Live
Maintenance, refer to “Sensor Module Replacement” in
the "Maintenance" section of this manual.
Sensor
Module
(GTS)
Transmitter
(GTX)
Detector (GT3000)

2
12.4 95-8616
Automatic Sensor Module Recognition
The transmitter provides automatic gas sensor
recognition, allowing the operator to access the
following information via HART, or a UD10 or UD20
Universal display:
• Sensor module serial number
• Gas type
• Measurement range
The sensor module is factory programmed for the gas
type and measurement range. When the sensor module
powers up, the transmitter reads and acknowledges
the gas type and measurement range.
NOTE
The UD30 does not provide automatic sensor
module recognition. The UD30 Setup Wizard
must be used to congure the GTS sensor.
GTX TRANSMITTER
The transmitter output is a linear 4-20 mA dc signal
with HART communication that directly corresponds to
0-100% full scale.
A 3.8 mA output indicates sensor calibration in progress
(17.3 mA for O2sensor). The GT3000 comes with one
of two pre-programmed fault output levels: 2.45 mA or
3.5 mA.
Priority of output signals from highest to lowest is:
1Calibration
(In progress)
2Fault
3Gas Level
Transmitter Wiring
The GTX transmitter is a two-wire loop powered device
that uses a three-wire cable (power, signal, and earth
ground) for connecting to a controller or monitoring
device. The use of shielded cable is required.
REAL TIME CLOCK (RTC)
The GTX transmitter has a real time clock with battery
back-up, that is used for time stamping the event logs.
The time and date are set and read using a UD10/UD20
Universal Display Unit, a HART communication device,
or AMS software. The time stamp on the logs will not be
correct if the RTC in the transmitter is not set correctly.
NOTE
The UD30 does not read/set the GTX Real Time
Clock.
HISTORY/EVENT LOGS
Both the transmitter and sensor are able to store 256
history logs, which are saved in non-volatile memory
and retained through power cycles. A UD10/UD20
Universal Display Unit, a HART communication device,
or AMS software is required to view the history logs.
NOTE
The UD30 does not read the GT3000 logs.
Sensor Logging Capability
The sensor module logs the following operating
parameters in non-volatile memory:
• Running Hours - The sensor module maintains the
total operating hours, and cannot be reset.
• Min/Max Temperature - The sensor module
maintains the minimum and maximum temperatures
with a date and time stamp.
• Calibration - The sensor module logs the calibration
history with a date and time stamp, along with the
success or cause of failure codes. See Table 1. The
zero and span values (AD converter values recorded at
the time of calibration) are also saved. This allows the
logs to follow the sensor module when it is calibrated
separately from the transmitter. (Calibration data is
available via a UD10/UD20, a HART communication
device, or AMS software.)
NOTE
GT3000 Calibration data cannot be read via a
UD30.
The sensor module gets the current time and date
from the transmitter and provides calibration log
information to the transmitter. See Figure 1.
Number Denition
0EMPTY LOG
1 NOT USED
2 NOT USED
3ZERO CAL
4SPAN CAL
5ABORT CAL
6 FAILED CAL
7 NOT USED
8 NOT USED
9 INIT CAL LOG
10 NOT USED
11 CLR CAL FAULTS
Table 1—Calibration Status Codes

3
12.4 95-8616
Transmitter Logging Capability
The transmitter logs the following events with a time
and date stamp:
• Power-up
• Sensor change
• All Faults.
HART COMMUNICATION
The transmitter supports HART communication on the
4-20 mA loop. This allows for configuration capability
and provides device status information, calibration, and
diagnostics capabilities. The GT3000 is compatible
with HART interface devices such as a HART handheld
communicator, the Det-Tronics UD10 or UD20 Display
Unit, or an AMS system. (See Appendix F for HART
menu structure.)
NOTE
The UD30 does not have HART communication.
MAGNETIC SWITCH
The GT3000 is furnished with an internal magnetic reed
switch as part of the user interface. The magnetic switch
allows the user to initiate calibration by momentarily
placing a magnet against the housing at the designated
location. See Figure 2.
LEDs
The GT3000 has one green and one yellow LED
(See Figure 3). The LEDs are used to signal normal,
calibration, and fault conditions. See Table 2.
NOTE
The GT3000 does not have alarm setpoints and,
therefore, does not have a red LED.
GREEN LED (ON)
YELLOW LED (OFF)
A2450
Figure 3— Location of LEDs on GT3000 Gas Detector
MAGNETIC
SWITCH
B2443
Figure 2—Location of Magnetic Switch on GT3000 Detector
Table 2—LEDs and Analog Output
During Various Operating Conditions
Function Green LED Yellow LED
Analog
4-20 Signal
Output
Warm-up*Single Flash On 3.5***
Normal
Operation Steady On Off 4-20
Fault
Condition Off On 3.5***
Calibration Off See Table 5 3.8**
No Power Off Off 0
*Warm-up time can last up to 150 seconds.
**O2sensor generates 17.3 mA during calibration.
***2.45 for TYPE OUTPUT "29," reference GTX Model Matrix .
Transmitter
RTC
Event Logs
Sensor Module
Calibration Logs
GT3000
Gas Detector
HART Interface
Transmitter reads
calibration logs
from sensor
Transmitter updates
sensor module
time / date
Figure 1—GT3000 Logging

4
12.4 95-8616
SPECIFICATIONS
SENSOR AND TRANSMITTER
AVAILABLE SENSORS—
Refer to Appendix E.
CROSS SENSITIVITY—
See Appendix E for Cross Sensitivity information.
CALIBRATION—
Sensors are calibrated at the factory. Gas type and
range are read by the transmitter. Field calibration is
initiated at the detector, at the UD10/UD20 Universal
Display Unit, or by some other HART interface device.
NOTE: Calibration cannot be initiated via the UD30.
OPERATING VOLTAGE—
24 volts dc nominal. (12 Vdc minimum, 30 Vdc maximum).
Maximum ripple is 2 volts peak-to-peak.
If using the HART function, the installation must comply
with the HART power standard.
POWER CONSUMPTION—
0.8 watt maximum @ 30 Vdc.
CURRENT OUTPUT—
• 4–20 mA (Normal operating mode).
• 3.8 mA indicates calibrate mode.
• 3.5 mA or less indicates a fault condition (2.45 mA
option available).
MAXIMUM LOOP RESISTANCE—
300 ohms at 18 Vdc, 600 ohms at 24 Vdc.
WIRING—
The transmitter has flying leads, 20” long, 600V insulation.
Colors: Red = V+
Black = V–
Green = earth ground
Gauge: 22 AWG (red and black)
16 AWG (green).
WARM-UP—
Warm-up time can last up to 150 seconds.
OPERATING TEMPERATURE—
See Appendix E.
STORAGE TEMPERATURE—
Transmitter: –55°C to +75°C / –67°F to +167°F.
Sensor: 0°C to +20°C / +32°F to +68°F.
Ideal: +4°C to +10°C / +39°F to +50°F.
EXPECTED STORAGE LIFE—
6 months in factory-sealed packaging
HUMIDITY RANGE—
15 to 90% RH.
PRESSURE RANGE—
Atmospheric ±10%.
INGRESS PROTECTION—
IP66.
THREAD OPTIONS—
3/4" NPT or M25.
ENCLOSURE MATERIAL—
GTX Transmitter: 316 Stainless Steel
GTS Sensor Module: PPA (30% carbon filled).
DIMENSIONS—
See Figure 4.
EXPECTED OPERATING LIFE—
2 years in an open air environment.
WARRANTY—(For the GTX and GTS)
12 months from date of installation or 18 months from
date of shipment, whichever occurs first.
CERTIFICATIONS—
For complete approval details, refer to the appropriate
Appendix:
Appendix A - FM
Appendix B - CSA
Appendix C - IECEx
Appendix D - Other Approvals
Figure 4—Dimensions of GT3000 Gas Detector in Inches (CM)
2.5
(6.4)
6.2
(15.8)
5.6
(14.3)
B2397
FM
APPROVED
®

5
12.4 95-8616
IMPORTANT SAFETY NOTES
CAUTION
The wiring procedures in this manual are intended
to ensure proper functioning of the device under
normal conditions. However, because of the
many variations in wiring codes and regulations,
total compliance to these ordinances cannot be
guaranteed. Be certain that all wiring complies
with all local codes. If in doubt, consult the
authority having jurisdiction before wiring the
system. Installation must be done by a properly
trained person.
CAUTION
This product has been tested and approved
for use in hazardous areas. However, it must
be properly installed and used only under the
conditions specied within this manual and
the specic approval certicates. Any device
modication, improper installation, or use in a
faulty or incomplete conguration will render
warranty and product certications invalid.
CAUTION
The GT3000 contains no eld repairable
components. User performed service is limited to
replacement of the gas sensor module.
CAUTION
Hazardous location temperature limits exceed
the product operational temperature limits. If the
sensor is exposed to temperatures beyond the
operational temperature limits listed in Appendix
E, then the sensor module (GTS) should be
replaced or a response test, as described in
the GT3000 Safety Manual (95-8685), shall be
performed.
LIABILITIES
The manufacturer’s warranty for this product is
void, and all liability for proper function of the
detector is irrevocably transferred to the owner or
operator in the event that the device is serviced or
repaired by personnel not employed or authorized
by Detector Electronics Corporation, or if the
device is used in a manner not conforming to its
intended use.
CAUTION
Observe precautions for handling electrostatic
sensitive devices.
NOTE
The sensor housing is made of Polyphthalamide
(PPA), 30% carbon lled (Material Manufacturer
RTP). Questions regarding chemical resistance
should be addressed to:
www.det-tronics.com
US toll free 800-468-3244 or 952-941-5665

6
12.4 95-8616
IN STALL ATION
The gas detector can be installed either in a stand-alone
configuration as a loop powered device, or it can be
connected to a UD10/UD20/UD30 Universal Display
Unit.
NOTE
The gas detector housing must be electrically
connected to earth ground. A dedicated earth
ground wire is provided on the transmitter for
connection to earth ground or to a grounded
housing.
The detector must always be installed per local
installation code.
Before installing the gas detector, define the following
application details:
IDENTIFICATION OF VAPOR(S) TO BE DETECTED
It is necessary to always identify the vapor(s) of interest
at the job site. In addition, the fire hazard properties
of the vapor, such as vapor density, flashpoint, and
vapor pressure should be identified and used to assist
in selecting the optimum detector mounting location
within the area.
IDENTIFICATION OF DETECTOR MOUNTING
LOCATIONS
Identification of the most likely leak sources and
leak accumulation areas is typically the first step in
identifying the best detector mounting locations. In
addition, identification of air current/wind patterns
within the protected area is useful in predicting gas leak
dispersion behavior. This information should be used to
identify optimum sensor installation points.
If the vapor of interest is lighter than air, place the sensor
above the potential gas leak. Place the sensor close to
the floor for gases that are heavier than air. Note that air
currents may cause a gas that is slightly heavier than
air to rise under some conditions. Heated gases may
also exhibit the same phenomenon.
The most effective number and placement of detectors
variesdependingontheconditionsonsite.Theindividual
designing the installation must often rely on experience
and common sense to determine the detector quantity
and best locations to adequately protect the area. Note
that it is typically advantageous to locate detectors
where they are accessible for maintenance. Locations
near excessive heat or vibration sources should be
avoided if possible.
Final suitability of possible gas detector locations
should be verified by a site survey. If any questions
arise regarding installation, please contact the factory.
DEVICE MOUNTING ORIENTATION
The gas detector must be mounted in a vertical position
only, with the sensor pointing down (See Figure 5).
IM PORTANT
The sensor should be oriented with the LEDs
facing forward so they are easily visible to
personnel within the area. To ensure correct
orientation (the LEDs are not visible when power
is off), position the GND lug on the left hand side
and the calibration notch to the front. Note that the
LEDs are located directly above the calibration
notch.
GREEN LED
CALIBRATION NOTCH
B2436
GND LUG
Figure 5—Correct Mounting Orientation for the GT3000

7
12.4 95-8616
DETECTOR INSTALLATION
3/4" NPT Models
3/4" NPT models have Tapered Threads and no Lock
Nut. Install the sensor as follows:
1. Screw the detector into the appropriate entry on
the termination box. Ensure a minimum of 5 fully
engaged threads. Use of teflon tape on NPT threads
is recommended to prevent thread damage.
2. When the detector gets tight, note the position of the
LEDs, GND lug and calibration notch and adjust the
detector as required so that the LEDs will be easily
visible.
M25 Models
M25 models have Straight Threads and a Lock Nut.
Install the detector as follows:
1. Screw the detector lock nut as far back as it will go,
then screw the detector into the appropriate entry
on the termination box. Ensure a minimum of 7 fully
engaged threads.
2. With the detector in the desired position (LEDs
visible as shown in Figure 5), tighten the lock nut
against the termination box to hold the detector
securely in place.
3. Tighten the set screws (minimum of two) to prevent
movement of the lock nut. See Figure 6.
SENSOR TERMINATION BOX
A Det-Tronics sensor termination box (Model STB)
is required for installing the sensor in a stand alone
configuration, or for installing the GT3000 remotely
from the UD10/UD20/UD30 Universal Display Unit.
When installing the GT3000 remotely from a UD10/
UD20/UD30, two-conductor shielded cable is required
to prevent possible nuisance EMI/RFI. The maximum
cable length between the GT3000 and the UD10/
UD20/UD30 is 2000 ft.
WIRING
POWER SUPPLY REQUIREMENTS
Calculate the total gas detection system power
consumption rate in watts from cold start-up. Select a
power supply with adequate capability for the calculated
load. Ensure that the selected power supply provides
sufficient regulated and filtered output power for the
entire system. If a back-up power system is required, a
float-type battery charging system is recommended. If
an existing source of power is being utilized, verify that
system requirements are met.
NOTE
The power supply must also meet the noise
requirements for HART systems.
WIRING CABLE REQUIREMENTS
Always use proper cabling type and diameter for input
power as well as output signal wiring. 22 to 14 AWG
shielded stranded copper wire is recommended.
Always install a properly sized, master power fuse or
breaker on the system power circuit.
NOTE
The use of shielded cable in conduit or shielded
armored cable is highly recommended. In
applications where the wiring is installed in
conduit, dedicated conduit is recommended.
Avoid low frequency, high voltage, and
non-signaling conductors to prevent nuisance
EMI problems.
CAUTION
The use of proper conduit installation techniques,
breathers, glands, and seals is required to prevent
water ingress and/or maintain the explosion-proof
rating.
Set Screws
Figure 6—Location of Lock Nut and Set Screws
(Metric Models Only)

8
12.4 95-8616
INTRINSIC SAFETY BARRIERS
When the GT3000 is used in an intrinsically safe
installation, care must be taken when selecting an I.S.
barrier to ensure proper function of the device. The
GT3000 has been tested with the types of barriers listed
in Tables 3 and 4.
Table 3 lists zener barriers.
Table 4 lists isolating barriers that provide a wider range
of input power supply voltages and are less dependent
on voltage drops in the loop. When using IS Barriers,
the user must ensure a minimum of 10.5 VDC across
the GTX transmitter Red and Black Wires, for proper
operation of the GT3000.
For additional information regarding proper IS
installation, refer to the Control Drawings in Appendix
G of this manual.
WIRING PROCEDURE
Wire the transmitter as shown in Figures 7 through 12.
CAUTION
If ripple on the main power source causes
interference with the HART function, the use
of an isolated power source (Figure 12) is
recommended for best HART performance.
Manufacturer P/N
Turck MZB87PX
MTL MTL7787P+
Pepperl & Fuchs Z787.h
Table 3—Acceptable Intrinsic Safety Barriers
for use with GT3000 – Zener Barriers
Manufacturer P/N
Turck IM33-11Ex-Hi
MTL 5541
Pepperl & Fuchs KCD2-STC-Ex1
Stahl 9160/13-10-11
Table 4—Acceptable Intrinsic Safety Barriers
for use with GT3000 – Isolating Barriers

9
12.4 95-8616
+
–
24 VDC
A2502
NOTE 1 GROUND THE SHIELD AT THE POWER SOURCE
END ONLY AND BOND THE SHIELD TO THE
ENCLOSURE.
NOTE 2 250 OHM RESISTOR REQUIRED FOR HART
MENU ACCESS.
NOTE 3 EXTERNAL HART COMMUNICATION DEVICES
CAN BE CONNECTED ACROSS THE 250 OHM
RESISTOR OR ACROSS THE GT3000.
NOTE 4 JUNCTION BOX MUST BE ELECTRICALLY
CONNECTED TO EARTH GROUND.
BLACK
RED
SEE NOTES 2 & 3
SEE NOTE 1
GT3000
GAS DETECTOR
SENSOR TERMINATION BOX
RED
RED
BLACK
BLACK
GREEN
Figure 7—GT3000 Wired to Sensor Termination Box in Stand-Alone Conguration (Explosion-Proof)
+
–
24 VDC
A2530
NOTE 1 GROUND THE SHIELD AT THE POWER SOURCE
END ONLY ONLY AND BOND THE SHIELD TO THE
ENCLOSURE.
NOTE 2 250 OHM RESISTOR REQUIRED FOR HART
MENU ACCESS.
NOTE 3 EXTERNAL HART COMMUNICATION DEVICES
CAN BE CONNECTED ACROSS THE 250 OHM
RESISTOR OR ACROSS THE GT3000.
NOTE 4 JUNCTION BOX MUST BE ELECTRICALLY
CONNECTED TO EARTH GROUND.
BLACK
RED
SEE NOTES 2 & 3
SEE NOTE 1
GT3000
GAS DETECTOR
SENSOR TERMINATION BOX
RED
RED
BLACK
BLACK
GREEN
HAZARDOUS LOCATION NON-HAZARDOUS LOCATION
INTRINSIC
SAFETY
BARRIER
Figure 8— GT3000 Wired to Sensor Termination Box in Stand-Alone Conguration (Intrinsically Safe)

10
12.4 95-8616
Figure 9—GT3000 Wired Directly to UD20 Display Unit (Explosion-Proof)
+
–
24 VDC
UD20 DISPLAY UNIT
B2478
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
J2
NOTE 1 CONNECT THE GREEN DETECTOR LEAD TO THE
CHASSIS GROUND LUG ON THE INSIDE BOTTOM
OF THE UD20 DISPLAY UNIT ENCLOSURE.
NOTE 2 250 OHM RESISTOR REQUIRED FOR HART
MENU ACCESS.
NOTE 3 EXTERNAL HART COMMUNICATION DEVICES CAN BE
CONNECTED ACROSS THE 250 OHM RESISTOR,
ACROSS J2-5 AND J2-6, OR ACROSS J2-2 AND J2-3.
NOTE 4 JUNCTION BOX MUST BE ELECTRICALLY
CONNECTED TO EARTH GROUND.
NOTE 5 GROUND THE SHIELD AT THE POWER SOURCE
END ONLY ONLY AND BOND THE SHIELD TO THE
ENCLOSURE.
SEE NOTES 2 & 3
SEE NOTE 5
GT3000
GAS DETECTOR
+
+
–
–
SHIELD
SHIELD
SENSOR
LOOP
POWER
LOOP
BLACK
RED
GREEN SEE NOTE 1
+
–
24 VDC
UD20 DISPLAY UNIT
D2408
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
J2
NOTE 1 GROUND THE SHIELD AT THE POWER SOURCE
END ONLY ONLY AND BOND THE SHIELD TO THE
ENCLOSURE.
NOTE 2 250 OHM RESISTOR REQUIRED FOR HART
MENU ACCESS.
NOTE 3 EXTERNAL HART COMMUNICATION DEVICES CAN BE
CONNECTED ACROSS THE 250 OHM RESISTOR,
ACROSS J2-5 AND J2-6, OR ACROSS J2-2 AND J2-3.
NOTE 4 JUNCTION BOXES MUST BE ELECTRICALLY
CONNECTED TO EARTH GROUND.
BLACK
RED
SEE NOTE 1
SEE NOTES 2 & 3
SEE NOTE 1
GT3000
GAS DETECTOR
SENSOR TERMINATION BOX
RED
RED
BLACK
BLACK
GREEN +
+
–
–
SHIELD
SHIELD
SENSOR
LOOP
POWER
LOOP
Figure 10—GT3000 with Sensor Termination Box Wired to UD20 Display Unit (Explosion-Proof)

11
12.4 95-8616
Figure 11—GT3000 Wired Directly to the UD10 Display Unit / UD10 Wired to PLC with 4-20 mA Non-Isolated Sourcing Output
GT3000
GAS DETECTOR
BLACK
RED
GREEN
SEE NOTE 1
NOTE 1 CONNECT THE GREEN DETECTOR LEAD
TO THE CHASSIS GROUND LUG ON THE
INSIDE BOTTOM OF THE DISPLAY UNIT
ENCLOSURE.
NOTE 2 JUNCTION BOXES MUST BE ELECTRICALLY
CONNECTED TO EARTH GROUND.
C2453
NON-HAZARDOUS LOCATION HAZARDOUS LOCATION
Sensor Connector
Power Supply Connector
Output Loop
Connector
MODBUS
Connector
Relay Connector
P1
J2
J3
J4
P2
4-20 mA +
4-20 mA –
SHIELD
COM
RS485 A
RS485 B
HIGH ALARM COM
HIGH ALARM NC
HIGH ALARM NO
AUX ALARM COM
AUX ALARM NC
AUX ALARM NO
LOW ALARM COM
LOW ALARM NC
LOW ALARM NO
FAULT COM
FAULT NC
FAULT NO
24 VDC –
24 VDC +
SHIELD
24 VDC –
24 VDC +
SHIELD
SHIELD
CALIBRATE
24 VDC –
4-20 mA
24 VDC +
P1-3
P1-2
P1-1
J2-3
J2-2
J2-1
J4-1
J4-2
J4-3
J4-4
J4-5
J4-6
J4-7
J4-8
J4-9
J4-10
J4-11
J4-12
J3-1 J3-2 J3-3 J3-4 J3-5
P2-6 P2-5 P2-4 P2-3 P2-2 P2-1
UD10
DISPLAY UNIT
24 VDC
INPUT
4-20 mA
PLC 4-20 mA INPUT CARD
–
+
250
OHMS
MINIMUM
Notes: Resistor may be external if voltage input card is used.
Sinking resistance at PLC must be 250 ohms minimum
for HART communication.
P12
Figure 12—GT3000 Wired Directly to the UD10 Display Unit / UD10 Wired to PLC with 4-20 mA Isolated Sourcing Output
GT3000
GAS DETECTOR
BLACK
RED
GREEN
SEE NOTE 1
NOTE 1 CONNECT THE GREEN DETECTOR
LEAD TO THE CHASSIS GROUND
LUG ON THE INSIDE BOTTOM OF
THE DISPLAY UNIT ENCLOSURE.
NOTE 2 JUNCTION BOXES MUST BE
ELECTRICALLY CONNECTED
TO EARTH GROUND.
C2479
NON-HAZARDOUS LOCATION HAZARDOUS LOCATION
Sensor Connector
Power Supply Connector
Output Loop
Connector
MODBUS
Connector
Relay Connector
P1
J2
J3
J4
P2
4-20 mA +
4-20 mA –
SHIELD
COM
RS485 A
RS485 B
HIGH ALARM COM
HIGH ALARM NC
HIGH ALARM NO
AUX ALARM COM
AUX ALARM NC
AUX ALARM NO
LOW ALARM COM
LOW ALARM NC
LOW ALARM NO
FAULT COM
FAULT NC
FAULT NO
24 VDC –
24 VDC +
SHIELD
24 VDC –
24 VDC +
SHIELD
SHIELD
CALIBRATE
24 VDC –
4-20 mA
24 VDC +
P1-3
P1-2
P1-1
J2-3
J2-2
J2-1
J4-1
J4-2
J4-3
J4-4
J4-5
J4-6
J4-7
J4-8
J4-9
J4-10
J4-11
J4-12
J3-1 J3-2 J3-3 J3-4 J3-5
P2-6 P2-5 P2-4 P2-3 P2-2 P2-1
UD10
DISPLAY UNIT
24 VDC
24 VDC
INPUT
4-20 mA
PLC 4-20 mA INPUT CARD
–
–
+
+
250
OHMS
MINIMUM
Notes: Resistor may be external if voltage input card is used.
Sinking resistance at PLC must be 250 ohms minimum
for HART communication.
P12

12
12.4 95-8616
CALIBRATION
GT3000 CALIBRATION
The GT3000 supports one person calibration, which
can be initiated locally using a calibration magnet, or
remotely with a command from the HART interface.
The calibration process is automatic, with the exception
of gas delivery. LEDs on the transmitter guide the
operator when to apply and remove the calibration gas
See Table 5.
NOTE
The HART interface allows the operator to adjust
the calibration gas concentration within the range
of 30 to 90% full scale. The default value for all
gas sensors except oxygen is 50% full scale.
Oxygen sensors use a default value of 20.9%.
All GT3000 gas detectors require a two-point
calibration — zero and span. The calibration process
can be initiated using the magnetic switch or through a
HART interface, such as the UD10/UD20. All sensors,
including oxygen, should be in clean air (20.9% oxygen)
when the calibration sequence is initiated.
NOTE
The GT3000 calibration cannot be initiated from
the UD30.
The calibration process proceeds automatically after
initiation. Onboard LEDs signal the operator when to
apply the calibration gas and inform of the progress.
The calibration can be aborted by activating the
magnetic switch or with a command from the HART
communication device in lieu of applying the calibration
gas.
If the calibration process takes longer than 10 minutes,
the detector will time-out and signal a calibration fault.
If the calibration sequence is aborted or not completed
successfully, the detector reverts back to the previous
calibration values and signals a calibration fault. The
calibration fault can be cleared by activating the
magnetic switch for one second or by performing a
successful calibration.
The calibration process can fail for the following
causes:
• Zero is out of range
• Span is out of range
• Time-Out.
The time and date of calibration events are logged in
non-volatile memory along with the calibration outcome.
Possible calibration scenarios include the following:
• Successful Calibration
• Aborted Calibration
• Failed Calibration and the Cause
The Sensor Module stores calibration data in non-volatile
memory to allow the sensor to be calibrated off-site and
installed in the field without the need for re-calibration.
Calibration Step Yellow LED
Waiting for Zero Steady
Waiting for Gas Blinking
Waiting for Span Blinking
Remove Cal Gas Off
Table 5— LEDs During Calibration

13
12.4 95-8616
CALIBRATION PROCEDURE
NOTE
When attaching or removing the calibration cup,
push or pull the cup with a slight clockwise twist.
Turning counterclockwise can cause the lter
assembly on the GT3000 to loosen. If the lter
assembly is inadvertently loosened, tighten it by
hand (no tools required).
Toxic and Hydrogen Sensors
1. Clean air must be present at the GT3000 sensor
module prior to initiating calibration. The use of
bottled air is recommended.
2. Initiate calibration by momentarily holding the
calibration magnet against the designated location
on the sensor module (see Figure 13) until the
green LED turns off and the yellow LED turns on
steady (approximately one second). Remove
the magnet when the green LED turns off. The
detector immediately begins taking zero readings.
Calibration can also be initiated via HART interface
(see Appendix F) or the UD10 (see manual number
95-8618).
3. When the zero calibration is complete, the yellow
LED changes from steady to blinking. Apply the
calibration gas to the sensor.
4. When the yellow LED turns off, remove the calibration
gas. The gas level at the sensor gradually returns to
zero. The green LED turns on steady to indicate that
the device has returned to normal operation, using
the new calibration data.
NOTE
The calibration procedure must be completed
within a ten minute period. If the calibration is not
completed, a calibration fault will be generated
and the transmitter will continue to use the
previous calibration data.
NOTE
To ensure reliable detection performance,
calibration should be performed at regularly
scheduled intervals. Various factors affect the
time interval between periodic calibrations
(typically 30, 60, or 90 day intervals, depending
on the ambient conditions).
NOTE
Calibration of ammonia sensor is recommended
any time the sensor has been exposed to 90 ppm
ammonia.
Oxygen Sensor
1. Using the magnet, activate the magnetic calibration
switch on the GT3000. The green LED turns off and
the yellow LED turns on steady.
2. The device automatically performs the zero
calibration.
3. When the yellow LED on the GT3000 flashes, the
device automatically performs the span calculation.
If using bottled 20.9% oxygen, apply immediately.
4. After successful calibration, the yellow LED turns off
and the green LED turns on steady to indicate that
the device has returned to normal operation, using
the new calibration data. Remove calibration gas (if
used).
LED
PLACE MAGNET HERE
TO ACTIVATE INTERNAL
MAGNETIC SWITCH
B2452
Figure 13—Location of Magnetic Switch on GT3000 Detector

14
12.4 95-8616
MAINTENANCE
NOTE
Refer to the GT3000 Safety Manual (number
95-8685) for specific requirements and
recommendations applicable to the proper
installation, operation, and maintenance of all
certied SIL 2 capable GT3000 gas detectors.
ROUTINE INSPECTION
The gas inlet to the sensor should be inspected
periodically, or during scheduled maintenance, to
ensure that external obstructions such as plastic bags,
litter, heavy oil and tar, paint, mud, snow, or other
materials do not block the flow of gas to the sensor,
thereby impairing the performance of the device.
To replace a dirty or damaged filter, simply grasp the
filter assembly and twist counterclockwise to remove.
Screw the new filter in place on the sensor module. Do
not overtighten. See Figure 14.
To ensure reliable protection, it is important to check and
calibrate the detection system on a regularly scheduled
basis. The frequency of these checks is determined by
the requirements of the particular installation – typically
30, 60, or 90 day intervals, depending on the ambient
conditions.
SENSOR MODULE REPLACEMENT
(Live Maintenance)
The hot swappable, intrinsically safe sensor module
can be replaced in the field without removing power or
de-classifying the hazardous area.
To replace the sensor module, locate the three captive
screws on the front of the module as shown in Figure
15. Loosen these screws and remove the old sensor
module. Install the new sensor module onto the
transmitter, and tighten the screws. To ensure proper
moisture ingress protection and grounding of the
plastic nosepiece, tighten the screws to 70-100 oz-in
(0.5-0.7 N-m).
IM PORTANT
Always exercise caution when working in
combustible gas areas. Follow replacement
instructions explicitly.
NOTE
Removing the sensor module with power applied
will result in a fault condition until a new sensor
module of the same type is installed. When
replacing an oxygen sensor, this action will result
in an alarm condition as the decreasing 4–20 mA
signal passes through the alarm range. Inhibit
response devices to prevent unwanted actuation.
NOTE
Oxygen (O2) electrochemical sensors contain
lead (Pb). Observe all local waste management
requirements when disposing of exhausted O2
electrochemical sensors.
NOTE
Electrochemical sensors are highly sensitive
to antiseptic wipes and/or cleaning products
that contain alcohol and antibacterial/antiviral
agents. Antiseptic products should be removed
from areas where sensors are stored, handled,
or used. If antiseptic products are being used on
workers' hands, sufficient time should be allowed
for the alcohol to evaporate before handling
sensors.
LOOSEN CAPTIVE PHILLIPS
SCREWS (3) TO REMOVE
SENSOR MODULE.
B2451
Figure 15—Location of Screws for Sensor Module Replacement
Figure 14—GT3000 with Replaceable Filter Removed
TURN FILTER COUNTERCLOCKWISE
TO REMOVE. NO TOOLS REQUIRED.
A2481

15
12.4 95-8616
DEVICE REPAIR AND RETURN
Prior to returning devices, a Return Materials
Authorization (RMA) number must be obtained. The
process for obtaining this number can be found here
(www.det-tronics.com/Products/repair-and-warranty-
services). You may also contact your authorized local
sales representative or Det-Tronics Technical Support
for assistance:
+1 800.765.3473, ext.3
+1 9 5 2. 9 41. 5 6 6 5
M-F, 8 AM - 5 PM, Central Prevailing Time, US
[e-mail]
Pack the unit properly. Always use sufficient packing
material. Where applicable, use an antistatic bag as
protection from electrostatic discharge.
NOTE
Inadequate packaging that ultimately causes
damage to the returned device during shipment
will result in a service charge to repair the damage
incurred during shipment.
Return all equipment transportation prepaid to the
factory in Minneapolis.
NOTE
It is highly recommended that a complete spare
be kept on hand for eld replacement to ensure
continuous protection.
ORDERING INFORMATION
Sensor module (GTS) and transmitter (GTX) must be
ordered separately. Refer to the Transmitter and Sensor
Model Matrix on next page for ordering details.
GTS GAS SENSORS
Gas Concentration
Hydrogen Sulfide (H2S) 0-20 ppm
Hydrogen Sulfide (H2S) 0-50 ppm
Hydrogen Sulfide (H2S) 0-100 ppm
Oxygen (O2)* 1-25% V/V
Carbon Monoxide (CO) 0-100 ppm
Carbon Monoxide (CO) 0-500 ppm
Ammonia (NH3) 0-100, or 0-500 ppm
Sulfur Dioxide (SO2) 0-20 ppm
Sulfur Dioxide (SO2) 0-100 ppm
Chlorine (Cl2) 0-10 ppm
Hydrogen (H2) 0-1000 ppm
Nitrogen Dioxide (NO2) 0-20 ppm
*Oxygen detector for O2depletion (< 21% V/V) only.
Oxygen sensor will indicate a fault if <1% volume
oxygen is detected.
CALIBRATION KITS FOR GAS SENSORS
Part Number Gas / Concentration
010274-001 H2S / 10 ppm
010274-002 H2S / 25 ppm
010 274 - 0 0 3 H2S / 50 ppm
010 274 - 0 0 8 H2/ 500 ppm
010 274 - 0 0 9 O2 / 20.9%
010274-010 CO / 50 ppm
010274-011 CO / 250 ppm
010 274 - 0 0 5 N H3 / 50 ppm
010 274 - 0 0 6 N H 3 / 250 ppm
010274-013 SO2 / 10 ppm
010274-014 SO2 / 50 ppm
010 274 - 0 0 4 Cl2/ 5 ppm
010274-016 NO2/ 10 ppm
Replacement gas cylinders for all calibration kits are
available.
PARTS & ACCESSORIES
Part Number Description
009700-001 Magnetic Tool
009737-001 Calibration Cup
107427-059 Calibration Cup O-ring
101678-007 3 Foot Tubing
162552-001 Regulator, 1 LPM
009640-001 Replacement Filter
012509-001 Q312 Sample Draw without Fittings
012509-002 Q312 Sample Draw with Fittings
010780-003 GT3000 Remote Calibration Adaptor
010783-001 GT3000 Remote Calibration Filter
012513-XXX* Q912 Duct Mount Enclosure, M25
012514-XXX* Q912 Duct Mount Enclosure, 3/4"
*Refer to the Product Catalog for a list of options.

16
12.4 95-8616
GTS Sensor Model Matrix
MODEL DESCRIPTION
GTS Gas Sensor Module
TYPE GAS / RANGE
H2S Hydrogen Sulde (certied SIL 2 capable)
20P 0 - 20 PPM
50P 0 - 50 PPM
100P 0 - 100 PPM
H2S+ Hydrogen Sulde (certied SIL 2 capable)
20P 0 - 20 PPM
50P 0 - 50 PPM
100P 0 - 100 PPM
CL2 Chlorine
10P 0 - 10 PPM
NH3 Ammonia
100P 0 - 100 PPM
500P 0 - 500 PPM
H2 Hydrogen
1000P 0 - 1000 PPM
O2 Oxygen (certied SIL 2 capable)
25V 0 - 25 % by Vol
CO Carbon Monoxide
100P 0 - 100 PPM
500P 0 - 500 PPM
SO2+ Sulfur Dioxide
20P 0 - 20 PPM
100P 0 - 100 PPM
NO2 Nitrogen Dioxide
20P 0 - 20 PPM
TYPE SAFETY INTEGRITY LEVEL
SSIL 2
NNON-SIL
TYPE LABEL
CCHINESE
EENGLISH
KKAZAKH
PPORTUGUESE (Brazil)
RRUSSIAN
TYPE HOUSING
SSTANDARD
EENHANCED
SHIELDING

17
12.4 95-8616
GTX Transmitter Model Matrix
MODEL DESCRIPTION
GTX Gas Transmitter
TYPE MATERIAL
SStainless Steel (316)
TYPE THREAD SIZE
N3/4" NPT
MMetric M25
TYPE OUTPUTS
26 4-20 mA, HART (3.5 mA FAULT)
29 4-20 mA, HART (2.45 mA FAULT)
TYPE APPROVALS
BINMETRO (Brazil)
CCSA
FFM
IIECEx
KKAZAKH
NFM/CSA/IECEx
RRUSSIA
YChina
TYPE CLASSIFICATION (Division/Zone)
4Intrinsically Safe
5Explosion-Proof

18
12.4 95-8616
APPENDIX A
FM APPROVAL DESCRIPTION
The following items, functions, and options describe the FM approval.
APPROVAL
Electrochemical Gas Detector, GT3000 Series.
Explosion Proof Model
Class I, Div. 1, Groups A, B, C, & D (T4).
Class I, Div. 2, Groups A, B, C, & D (T4).
Class I, Zone 1, AEx db mb [ia Ga] IIC T4 Gb.
IP66.
Conduit seal not required.
Acidic atmospheres excluded.
Intrinsically Safe Model
IS Class I, Div. 1, Groups A, B, C, & D (T4).
Class I, Zone 0, AEx ia IIC T4 Ga.
IP66.
Install according to Control Drawing 009803-001 (See Appendix G)
Special Conditions of Safe Use:
The GTX Toxic Gas Module shall be connected to an UD10, UD20, STB or U9500 enclosure supplied by the
manufacture and rated to maintain the type of protection specified on this certification.
Performance verified per ANSI/ISA 92.00.01 and FM6340.