Teledyne 700 IR Series Instruction Manual page 34

700 IR Series
INFRARED GAS DETECTOR FOR COMBUSTIBLE AND CO
GASES
USER MANUAL
NOTE: The "Set Sensor Gain" function is executed during factory calibration of every OLCT
700/710 IR detector. In the field, this menu item is only needed when a replacement plug-in IR
sensor is being installed, or when mating a new ITM with an existing plug-in sensor. It is also
required if the Restore Defaults menu item is executed.
From the Set Sensor Gain text scroll, hold the magnet over PGM1 or PGM2 until the "" prompt
appears and then hold continuously for an additional 3 seconds. The display will scroll "Setting
Gain" and then show the count-up of the gain settings for the active and reference detectors. The
typical final values are A = 9 and R = 37. At conclusion, the OLCT 700/710ITM will display
"Gain Complete" and revert to "Set Sensor Gain" text scroll.
The user can then choose to either: 1) move to another menu item by executing a momentary
hold, or 2) return to Normal Operation via 5 second automatic timeout.
3.5.8 Signal Output Check
Signal Output Check provides a simulated 4-20mA output and RS-485 Modbus™ output. This
simulation allows the user to conveniently perform a functional system check of their entire safety
system. This signal output simulation also aids the user in performing troubleshooting of signal
wiring problems.
From the "Signal Output Check" text scroll, hold the magnet over PGM1 or PGM2 until the ""
prompt appears and then hold continuously for an additional 10 seconds. Once initiated, the
display will scroll "Simulation Active" until the function is stopped. During simulation mode, the 4-
20mA value will be increased from 4.0mA to 20.0mA (in 1% of range increments at about a 1
second update rate) and then decreased from 20.0mA to 4.0mA. The same simulation sequence
is applied to the Modbus™ output gas reading.
NOTE: Signal Output Check stays active indefinitely until the user stops the function. There is no
automatic timeout for this feature.
To end simulation mode, hold magnet over PGM1 or PGM2 for 3 seconds. The display will either
move to the prior menu item or move to the next menu item respectively.
Move to another menu item by executing a momentary hold, or, return to Normal Operation via
automatic timeout of about 15 seconds.
3.5.9 Restore Factory Defaults
Restore Factory Defaults is used to clear current user configuration and calibration data from
memory and revert to factory default values. This may be required if the settings have been
configured improperly and a known reference point needs to be re-established to correct the
problem.
NOTE: "Restoring Factory Defaults" should only be used when absolutely necessary. All
previously existing configurational inputs will have to be re-entered if this function is executed. A
full 10-second magnet hold on PGM 2 is required to execute this function.
28
2
NP700IRIMEN
Revision E.0