SenseAir aSENSE User manual

Document
IMA0156
Rev
4
Page
1 (3)
CO2 / temperature transmitter with heater
mounted in industrial housing
aSENSE with heater Mounting of the sensor onto the wall
1 Screw 5x25
2 Dowel
3 Cable entry bushing PG9
4 DIN rail
5 Draining holes
The DIN rail places the sensor 7 mm from the wall. This distance is very important for
the response time because the air inlets are situated at the back of the housing
facing the wall. The sensor should be mounted with the cable entry bushing upwards
and the draining holes downwards.
The sensor PCB is in an extra housing inside the outer housing.
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.
Gas and Air Sensors
aSENSE
Installation Manual

Document
IMA0156
Rev
4
Page
2 (3)
Electrical connections
The power supply has to be connected to and . is considered as
system ground. If the analogue output is connected to a controller the same ground
reference has to be used for the aSENSE unit and for the control system! Unless
different transformers are used, special precautions need to be taken.
PLEASE NOTE! The aSENSE signal and
power supply grounds are common
NOTE!
The same ground reference has to be used for
the aSENSE unit and for the control system!
Connect the power after mounting. The analogue
output should be connected before measuring.
Connection
Terminal
Function
Electrical Data
Remarks
Power (+)
Power ground (-)
24-29 VAC/DC+
(minimum 2 A continuously)
24 VAC/DC-
The heater is connected to G+ and
G0. Minimum temperature –30 oC
See note 1!
Out(1)
Out(2)
Not marked
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 G0 via PTC
fuse
According to positions of OUT1
and start point jumpers.
See note 2!
According to positions of OUT2
and start point jumpers.
See note 2!
See note 1!
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:aSENSE can deliver a voltage or a current loop for Out(1) / Out(2). 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 outputs, can have start points 0 % (0-10 VDC or 0-20mA) or 20% (2-10 VDC or 4-
20mA). The same start point is used for both outputs. See the user manual.
~
+
~
+

Document
IMA0156
Rev
4
Page
3 (3)
+
~
Terminals and jumpers on aSENSE. The darker positions are default settings.
The dimensions of the sensor in mm and inches
180(7.09)
94(3.7)
56(2.2)
62(2.44) 74(2.91)
15(0.59)
39(1.54)
SenseAir®AB (headquarter)
Stationsgatan 12 Phone: +46-(0)653 - 71 77 70
Box 96 E-mail: [e-mail]
820 60 Delsbo
SWEDEN Web site: www.senseair.com