3.3.2 FGDIO Intrinsically Safe Output Module Installation
Where an MCU system has been purchased with the FGDIO barriers already fitted, it will be
delivered correctly configured for the specified detector heads.
If an existing MCU system requires the addition of an FGDIO barrier, a kit of parts can be
purchased from Status Scientific Controls. This includes:
Input Module
Grey Protective Cover incorporating the FGDIO Barrier
Fitting Hardware (i.e. hex spacers, screws, washers etc…)
Tools Required:
5mm A/F Spanner Flat blade screwdriver Multimeter
Install the input module and the FGDIO barrier as follows:
1. Switch OFF the power supply to the MCU system.
2. Locate the position within the control unit for the new channel. Unscrew the two
knurled black thumbscrews that retain the grey protective cover.
3. Remove the two hexagonal spacers and associated washers that are revealed
beneath the cover.
4. Take the new input/barrier module assembly and pull the barrier cover away from
the input module circuit board.
5. Locate the new input module over the protruding studs (at the appropriate position
within the control unit) taking care to align the pins of the motherboard header plug
with the corresponding circuit board sockets.
6. Fit the M3x8 screws with shakeproof washers into the two holes at the front of the
circuit board. Replace the LHS hexagonal pillar and fit the M3x14 pillar and
shakeproof washer on the RHS.
7. Connect a multimeter set to measure voltage between pins 24 (0V) and 22 (+V).
8. Connect power to the control unit.
9. Determine the type of detector head to be used with the FGDIO module:
O
2
/ Toxic Detector Head:
Rotate VR1 and VR2 (fine and coarse adjust respectively) until the voltage indicated
by the multimeter reads 2.0V 0.5V.
Flammable Detector Head:
Adjust VR1 and VR2 (fine and coarse adjust respectively) until the voltage indicated
by the multimeter reads 8.0V 0.1V.
10. Switch off the power supply to the control unit.
11. Take the grey cover incorporating the FGDIO module and refit this over the input
module. Ensure the FGDIO connector locates into its mating half correctly. Secure
the cover in position using an M3x16 countersunk head screw on the RHS of the
barrier cover.
12. Connect the detector head to the output terminals of the FGDIO barrier following
installation diagrams (see section 3.3.1Error! Reference source not found.).
13. Reconnect power to the system.
14. Calibrate the new channel.
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