STATUS SCIENTIFIC CONTROLS MCU3 - Status Scientific Controls Gas Detectors

STATUS SCIENTIFIC CONTROLS
MCU System Installation and Hardware Configuration Manual
TD06/001
Issue:
6
Change Note:
1696
Page 4-2
4.1.1 Status Scientific Controls Gas Detectors
Status Scientific Controls design and manufacture a variety of fixed gas detectors. The detector
head used for monitoring oxygen or toxic gases (using conventional sensors) requires a 2-wire
connection whilst detector heads incorporating infrared sensors or pellistors require a 3-wire
connection.
4.1.1.1 FGD2 and FGD3 O
2
and Toxic 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 the wires from the detector head to PL1 on the input module observing the
following:
Detector Head Label
4-20mA Loop
PL1
Pin Number
-
24
+
21
• Connect power to the system and ensure the detector head operates (text on LCD
display, LED will flash once every six seconds approximately).
• Refit grey protective cover.
• Perform software configuration (refer to ‘MCU Software Configuration and System
Calibration Manual’).
• Perform system calibration (refer to ‘MCU Software Configuration and System Calibration
Manual’).
J12 J11 J10
J9 J8 J7 J6
J14
J13
- +
4-20mA Loop
PL1
Terminals
24V
0V
21
22
23
24
Current
Sensing
Circuit
Variable
Voltage
Output
The detector head is loop powered and sinks
a current directly proportional to the gas levels
that it detects.