STATUS SCIENTIFIC CONTROLS
MCU System Installation and Hardware Configuration Manual
4.1.1.2 FGD2 and FGD3 Flammable Detector Heads
Connection Procedure
• Disconnect power from the system.
• Remove the grey protective cover from the associated input module
• Configure the jumper switches as shown below (i.e. J6, J7, J11, J13 and J14 switched
ON, all others OFF)
• Connect a voltmeter (range 0-24V min) between pins 22 (+V) and 24 (0V) of PL1.
• Connect power to the system.
• Adjust VR1 and VR2 until voltmeter reads 4.5V 0.5V (VR1 and VR2 provide fine and
coarse voltage adjustment respectively).
• Disconnect power to the system and connect the wires from the detector head to PL1 on
the input module observing the following:
Detector Head Label
4-20mA Loop
• Connect power to the system and ensure the detector head operates (text on LCD
display, LED will flash once every six seconds approximately)
• Measure the voltage between the + and 0 terminals at the detector head.
• If necessary adjust VR1 and VR2 at the Input Module to give 4.5V 0.5V at the detector
head (7.0V absolute maximum).
• Refit grey protective cover.
• Perform software configuration (refer to ‘MCU Software Configuration and System
Calibration Manual’).
• Perform system calibration.
The electronics for the head derives its power from the
current loop. A separate supply is provided for the sensor
due to the sensor requiring more than the 4-20mA loop
current range.
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