Dokument
IMA 190
HFE507
Rev
5
Sid
27 (44)
Note 1
:
The ground terminal is used as negative power supply DC input or AC phase ground
(halfwave rectifier). The signal ground M, protected by a PTC resistor, is the same as power ground
(permitting a ”3-wire” configuration). A single transformer may be used for the entire system.
Note 2:
M-SENSE III can deliver both a voltage or a current loop for Out(1)/Out(2). For Out(4) a
voltage output or an open collector output is selected with jumper Out(4). To change between voltage
and current output mode the hardware jumpers are used. There is one jumper
for Out(1) and one for
Out(2), so that one output can be a voltage output and the other a current output. Both, voltage output
and current output, can have start points 0 % (0-10 VDC or 0-20mA) or 20% (2-10 VDC or 4-20mA)
selected from PC software.
Note 3: Current of Open Collector is internally returned to
terminal.
If for some reason the PCB must be removed it must be handed carefully
and protected from electrostatic discharge! Normally, removing the PCB is
not required.
No. Label
Function
(configurable)
3 Out(1)
CO-transmitter
0…100 ppm
4 Out(2)
CO
2
-transmiter 0…2000 ppm
6, 7
Out(3)
Gas alarm CO >35 ppm OR CO
2
>1500 ppm
8
Out(4)
Drift disturbing alarm or gas alarm
9, 10
DI 1
Extra terminal. Test function (N.O.)
If more holes are needed
the box has several drill markings for holes in two
dimensions, PG7 and PG9. Then fasten the cable entry bushing and seal properly.
Never feed more than one cable through each cable entry bushing, or else gas might
leak through!
The PCB can be removed during the making of holes. The PCB must be handled
carefully and protected from electrostatic discharge!
If the PCB is in the housing when the hole is made a background calibration, CALb,
using the push buttons should be made. See the function and maintenance
description.
Start-up of the M-SENSE III
Connect the power directly after mounting. The unit works best if the sensor is
continuously powered. The analogue outputs do not need to be connected before
use. An internal delay function prevents the alarm functions of the relay and OUT4
output during 15 minutes after power up. After short power failures the CO
2
measurements need this power up time to stabilize. The alarm outputs may be tested
after the 15 minutes delay by shorting the switch DI1. After long power failures the
sensor may need several days to restore the measuring functions.
NOTE! The CO probe gives incorrect readings near some chemicals,
e g silicone. This makes certain environments unsuitable for the
sensor.
