SenseAir aSENSE mIII User manual

Installation Manual
aSENSE mIII
6
4
8
73
5
2
9
9
1
Fig. 1
1 Wall plate
2 PCB (Factory supplied
mounted in box)
3 Temperature sensor for
internal compensation (not
shown)
4 Carbon monoxide sensor (not shown)
5 Hole for wall plate hooks
6 Snap-in lid
7 Locking screw of the lid (not shown)
8 PG9 cable entry bushing
9 Air holes

Fig. 2 Dimensions in mm (inch)
11 Lidlocking screw
12 Wall plate
13 Screw to hold the wall plate
14 Marking to drill hole for PG7
15 Marking to drill hole for PG9
Wall Mounting Instruction
1. Electrical cable entry. Mount the cable entry bushing in dimension PG9. Never feed more than
one cable through each cable entry bushing, or else gas might leak through!
2. Dismount the wall plate. The sensor is delivered with the wall plate mounted. The wall plate
has to be removed before the sensor is mounted onto the wall. Unscrew the screw on the side
of the box. See figure 3.
3. Screw the wall plate onto the wall. The sensor should be mounted 1 to 1,8 m above the floor.
The wall plate has holes for three screws. Drill holes for 3,5mm screws and put dowel into them.
Dowels and screws 3,5 x 25mm are included in a plastic bag
4. Attach the sensor box to the wall plate. It is done by a snap-in fitting. The wall plate has three
hooks that fit in holes in the sensor box. Fasten the screw on the side of the box.
The lid can be locked with the screw (11) at the bottom of the sensor box.
NOTE Normally the PCB should not be removed from the housing. If for some reason the PCB must
be removed it must be handled carefully and protected from electrostatic discharge.
38,5 (1,5) 10 (0,39)
9,5 (0,37)
85 (3,35)
142 (3,58)

Electrical connections
The power supply has to be connected to and . is considered as system ground.
Unless different transformers are used, special precautions need to be taken.
NOTE:
The signal ground is not galvanically separated from the aSENSE mIII power supply!
The same ground reference has to be used for the aSENSE mIII unit and for the control system!
Connection
Terminal
Function
Electrical Data
Remarks
~
+
Power (+)
Power ground (-)
24 VAC/DC+ (+-20%), 3W
24 VAC/DC-
2W without output load
See note 1!
Out(1)
Out(2)
5
Analogue Output 1 (+)
Analogue Output 2 (+)
Signal Ground (-)
0-10 VDC or 0-20 mA,
2-10 VDC or 4-20 mA,
Same as Output 1
Connected to via PTC fuse
According to positions of
Out(1) jumper and start
point selection.
See note 2!
See note 2!
See note 1!
6
7
Normally closed relay
Open at alarm situ-
ations and power loss
Contact free relay
minimum load 1mA/5V
rated load 0,5A/125VAC;
1A/24VDC
Triggered by register
Out(3)
8
Out(4)
Analogue Output 4 (+)
OR Open Collector
0-10 VDC
Max 0,5A, 55VDC / 40VAC
(half-wave rectifier protection)
According to positions of
Out(4).
See note 2 and 3!
DI1
Digital Input 1
Closed contact current 1mA
Open contact voltage max 5V
Do not apply any voltage
on this input!
Table I. Electrical terminal connections for aSENSE mIII
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
G0 (permitting a ”3-wire” configuration). A single transformer may be used for the entire system.
Note 2: aSENSE mIII 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. See the user manual.
Note 3:Current of Open Collector is internally returned to terminal.
~
+

DI1
~
+
Fig. 3.Terminals and jumpers on aSENSE mIII.The darker positions are default settings.
Numbers in figure 3
Label or marking
Function
3
Out(1)
CO-transmitter 0-100 ppm CO
4
Out(2)
CO2-transmitter 0-100 ppm CO2
6, 7
Out(3)
Gas alarm CO >35 ppm or CO2>1500 ppm
8
Out(4)
Error detected or gas alarm
9, 10
DI 1
Extra terminal. Alarm 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.
NOTE:The PCB must be handled carefully and protected from electrostatic discharge!
Start-up of the aSENSE mIII
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 2 minutes after power up. After short power
failures the CO measurements need this power up time to stabilise. The alarm outputs may be tested
after the 2 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.
DI1 Switch
for alarm
test
Jumper for
configuring the
linear output
start point to
0% or 20%
start point
Jumper to
choose
communi-
cation
protocol
Jumpers to
choose between
voltage or
current outputs
Jumper to choose
between open
collector or 0-10V
linear signal
Senseair®AB (headquarter)
Stationsgatan 12 Phone: +46-(0)653 - 71 77 70
Box 96 E-mail: [e-mail]
824 08 Delsbo
SWEDEN Web site: www.senseair.com