Detcon 700 Series Remote Sensor/Alarm Relay Module With HART Interface - Manual (Page 11)

700 HART-RAM I.M.
3. Set-up and Normal Operation
In normal operation, the HART-RAM display continuously shows the current sensor reading, which will
typically appear as “ 0 ”. Once every 1 minute the LED display will flash the sensor’s measurement units
and gas type (i.e. % LEL). If the 700 Gas Sensor or HART-RAM is actively experiencing any diagnostic
faults, a “Fault Detected” message will flash on the display once every minute. When the unit is in “Fault
Detected” mode with the red Fault LED on, PGM1 or PGM2 can be swiped to invoke a display of the active
faults.
In normal operation, the 4-20mA current output from the HART-RAM corresponds with the present gas
concentration and full-scale range. The HART interface output, which is on the same wire as the 4-20mA
output, provides the current gas reading, fault status and other sensor status on a continuous basis when
polled.
If the Modbus™ communication between the HART-RAM and the 700 Gas Sensor is not functioning the
HART-RAM will display “COMM” and the ‘FLT’ LED will be illuminated.
NOTE: The 700 Gas Sensor must be set to Serial ID = 01 for proper communications set-up
with the HART-RAM.
3.1 View Sensor Status
View Sensor Status displays all current configurational and operational parameters from the 700 Gas Sensor
attached to it. These typically include sensor type, software version number, detection range, AutoSpan
level, days since last AutoSpan, estimated remaining sensor life, sensor diagnostics, input voltage, 4-20mA
output, and sensor ambient temperature.
To access the View Sensor Status menu, hold the magnet over PGM2 (ª) until the arrow prompt appears
and then hold continuously for 3 seconds. This will display the View Sensor Status text scroll. From the
View Sensor Status text scroll, hold the magnet over PGM1 (©) or PGM2 (ª) until the arrow prompt
appears and then hold continuously for an additional 3 seconds. The display will scroll the complete list of
sensor status parameters sequentially:
Current Software Version (of the HART-RAM)
Sensor Model Type
Range of Detection
Serial ID address
AutoSpan Level
Days From Last AutoSpan
Remaining Sensor Life
Sensor Diagnostics (varies by sensor type)
4-20mA Output
Input Voltage Supply
Operating Temperature
Alarm 1 Settings
Alarm 2 Settings
Fault Settings
When the sensor status list sequence is complete, the HART-RAM will revert to the “View Sensor Status”
text scroll. The user can then choose to either: 1) review list again by executing another 3 second hold, 2)
move to another menu item by executing a momentary hold, or 3) return to Normal Operation via 5 second
automatic timeout.
700 HART-RAM I.M. Rev. 0.0 Page 7 of 24