3
12.2
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 G for HART
menu structure.)
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.
**
O
2
sensor 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
