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Model 5100-28-IT Combustible Gas Sensor Module
Page: 21
5.3 SET-UP
The sensor module set-points menu is used to initially set-up the alarm set points, relay actions, gas type and
range, 4-20 mA action and RS-485/Sentry address and baud rates (A Menu Key is in Appendix J). When in
the set-up screen use the [] or [] keys to select sub-menu and use [E] to enter.
Alarms: Use the [] or [] keys to select Hi Alarm or Lo Alarm menu. Key [] will adjust the
setpoint upwards and Key [] will adjust the value downwards. Once it reaches the desired
setpoint, Key [E] will accept it and ACK will appear. Set-points can be configured using this menu
to values between 0 and 60.
Relays: Use the [] or [] keys to select Hi Alarm or Lo Alarm relay menu and press [E]. Use the
[] or [] keys to select the correct alarm relay action for the application, Latch, Sentry or Non-
Latch. Selecting “Sentry” enables the Sentry controller to make all alarm action decisions. *
indicates the current selection.
Gas: Use the [] or [] keys to select Range or Gas Type menu and press [E]. The “Gas Type”
menu allows the user to select the primary gas of interest (Methane). Use the [] or [] keys to
select the correct gas type for the application. When “Range” is selected menu provides any
choices of ranges available for the gas type selected. Use the [] or [] keys to select the desired
range.
Gas Type Range 1 Range 2
Methane 0-100%LEL 0-100%VOL
4-20mA: Use the [] or [] keys to select Calib or CalibOut menu and press [E]. The “Calib”
section of the menu allows the user to calibrate the 4 mA and 20 mA outputs. To calibrate the 4 mA
and 20 mA outputs it is necessary to have an amp meter connected to the 5100-28-IT and upon
selecting the 4 mA output calibration then the [] or [] keys can be used to adjust the 4 mA
reading on the amp meter until it reads 4 mA. Similar steps can then be performed for the 20 mA
output. The CalibOut section allows the user to select the 4-20 mA output action desired during
calibration. * indicates the current selected value. Available selections include:
Track – the 4-20mA value tracks the calibration gas exposed to the gas sensor module
C2.50mA – the 4-20mA value is held at 2.50mA during calibration
C4.00mA – the 4-20mA value is held at 4.0mA during calibration
User defined value
RS-485 - Use the [] or [] keys to select Address or Baud rate menu and press [E]. Note that the
5100-28-IT has a rotary switch on the faceplate and it is used to select addresses 1-15. When
connected to Sentry the user can select 1-8 and using Modbus RS-485 the user can select
addresses 1-15. For Modbus addresses above 15, set the rotary switch to 0 and then use the
“Address” menu to select any address up to 254. The Baud rate menu allows the user to select a
baud rate of 38400, 19200, 9600, 4800 or 2400. * indicates current selection.
RS-485 default parameters are: 38,400 baud, 8 bits, 1 stop bit, no parity
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