Automation Components ACI/ACI RH Room Series - Manual

2305 Pleasant View Rd. Middleton Industrial Park Middleton, WI 53562
PH: (608) 831-2585 FAX (608) 831-7407
I0000144.DOC REV 2
Installation and Operation Instructions
ACI/RH Room Series
ACI
Automation Components, Inc.
Please Read Instruction Carefully Before Installation!
The ACI/RH Room Series transmitters are a universal Relative Humidity transmitter that can be powered with either a DC
or AC supply voltage (See Figure #4). The ACI/RH uses a half-wave bridge rectifier to convert the AC power to a
useable DC voltage. Caution: When using a 24 VAC transformer, ACI recommends that you use an isolated
transformer. If sharing the transformer with your controller, valve, actuator, or any other device, be sure to connect
all of the devices with the proper polarity, since most controllers are earth grounded. Failure to do so may result in
damage to the ACI/RH, your controller, or any other devices that are attached due to a ground loop problem.
The ACI/RH Room transmitters are designed with a field selectable 4-20 mA, 0-5 VDC, or 0-10 VDC output signal that is
equivalent to 0 to 100% RH. Unless specified upon ordering, all units are shipped from the factory to accept DC power
with a 2-wire, 4-20 mA loop-powered output. Caution: When changing the Output Selection Switch (SW3) make sure
that the power supply is turned off before making any changes. Failure to do this may cause damage to the unit.
RH Wiring Diagram
ACI recommends that all ACI/RH 4-20 mA Room relative humidity transmitters be wired with a 16 to 22 AWG 2-wire
twisted pair or shielded cable for best results. All ACI/RH Room voltage output transmitters should use a 3-wire 16 to 22
AWG shielded cable. Note: When using a shielded cable, be sure to connect only (1) end of the shield to ground at
the controller. Connecting both ends of the shield to ground may cause a ground loop.
1 2 3 4
ON
4 5 6 3 2
ON
1
SW2
SW3
Io Gnd Vin Vo
Relative Humidity Sensor
Span Adjust
Potentiometer
Zero Adjust
Potentiometer
DC Power
AC Power
2
2
Figure # 2
Output Selection Switches (SW3)
4-20mA Out
4-20mA Out
3
4
4
3
AC/DC Power
AC/DC Power
0-10 VDC
0-5 VDC Out
ON
1
ON
1
4
4
3
3
ON
2
2
1
1
ON
Test and Calibration Switch Settings (SW2)
100% RH Output
50% RH Output
0% RH Output
Figure # 3
6
6
6
5 4
5
5
4
4
Normal Operating Condition
Reset to Original Calibration
Decrement RH Output
Increment RH Output
ON
ON
ON
3 2
3
3
2
2
6
1
5
1
1
4 3 2 1
ON
4
4
4
5 6
5
5
6
6
3 2
3
3
2
2
ON
1
ON
1
1
ON
Figure # 1
Wire Access Hole
S2 S1
Relative Humidity Temperature Sensor
Temperature Sensor (Combination Unit)