MSA FlameGard 5 UV/IR-E Instruction Manual page 18

POWER INPUTS
+B and 0V
These are the power connections. The supply voltage range is 20 to 36 VDC at the
detector (low voltage is detected at 18.5 VDC). The following maximum cable lengths
apply for a +24VDC supply (maximum 20 ohm loop):
AWG
14 AWG
16 AWG
18 AWG
20 AWG
22 AWG
ANALOGUE OUTPUT
4 – 20mA
The 4 to 20mA output is a current signal that corresponds to the following specification:
FAULT signal:
COPM Fault signal:
Ready signal:
WARN signal:
ALARM signal:
Output Load Max.:
For interfacing with 250 ohm input impedance devices, the following maximum cable
lengths apply (maximum 50 ohm loop):
AWG
14 AWG
16 AWG
18 AWG
20 AWG
22 AWG
COMMUNICATIONS OUTPUTS
DATA 1A
DATA 1B
DATA 2A
DATA 2B
These are the connections for the RS-485 serial communications ports 1 & 2. The RS-485
connection is used to either query the unit's status or to configure the unit. See Section 7
for detailed information on Modbus RTU protocol.
2
mm FEET METRES
2.08 4500 1370
1.31 2340 715
0.82 1540 470
0.52 970 300
0.33 670 205
0 to 0.2mA
2.0 ± 0.2mA
4.0 ± 0.2mA
16.0 ± 0.2mA
20.0 ± 0.2mA
600 ohms
2
mm FEET METRES
2.08 9000 2750
1.31 5800 1770
0.82 3800 1160
0.52 2400 730
0.33 1700 520
15
FlameGard 5 UV/IR-E