Omega Products RHB-CAC1 Installation Manual
Model RHB-CAC1
Dew Point Monitor
MODEL RHB-CAC1
Compressed Air Dew Point Monitor
OPERATOR’S MANUAL
MADE IN
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TABLE OF CONTENTS
1.0 GENERAL DESCRIPTION
2.0 INSTALLATION
2.1 MOUNTING
2.2 WIRING CONNECTIONS
2.3 SAMPLE CONNECTIONS
2.4 ALARM RELAY CONNECTIONS
2.5 ANALOG OUTPUT CONNECTIONS
Model RHB-CAC1
Dew Point Monitor
2.6 RS-232 SERIAL
3.0 FUNCTIONAL DESCRIPTION
3.1 DISPLAY
3.2 MABC BUTTON
3.3 SILENCE ALARM BUTTON
3.4 FLOW CONTROL VALVE
3.5 ALARM RELAY OUTPUT
3.6 ANALOG OUTPUT
4.0 SETUP
4.1 ALARM SET POINT
4.2 ABC INTERVAL
5.0 MAINTENANCE
5.1 ROUTINE MAINTENANCE
5.2 MIRROR CLEANING SCHEDULE
5.3 MIRROR CLEANING PROCEDURE
6.0 SPECIFICATIONS
7.0 APPENDICES
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Model RHB-CAC1
Dew Point Monitor
1.0 GENERAL DESCRIPTION
The Model RHB-CAC1 is a chilled mirror based hygrometer designed especially to monitor
the dew point in compressed air systems.
It is an integrated system including a microprocessor-based instrument, a chilled mirror dew
point sensor, a sample flow meter and valve, and associated tubing and fittings.
The wall mount enclosure is easily mounted to any vertical surface.
The Instrument includes:
• An eight-digit, alphanumeric, LED display to report the dew point and system status.
• Periodic sensor balance check.
• Programmable Alarm Set Point with visual, audible, and contact closure alarm indications.
• An SPDT (Form C) Alarm Relay.
• A 4 to 20mA analog output.
2.0 INSTALLATION
2.1 MOUNTING
The RHB-CAC1 can be installed on any flat vertical surface with four ¼ inch screws.
See Figure 2-1 for dimensional information.
2.2 WIRING CONNECTIONS
The RHB-CAC1 is designed to operate on AC voltages of 90 to 260 VAC with a maximum
power requirement of 40 Watts. The power entrance hole, located on the bottom of the
enclosure, is designed to accept a standard conduit, clamp type fitting or a compression type
fitting (supplied). The power line connections to the instrument are made using pigtail leads
and wire nuts.
Connect the power leads as follows:
1. Remove the three thumbscrews and the access cover as shown in Figure 2-2
2. Pull the three wires, black, white and green out of the wire box as shown in
Figure 2-3.
3. Insert the power line wires into the bottom of the enclosure and feed them up
through the wire box and out the access opening. Strip the wire ends back about
½". Using the three wire nuts, connect the wires black to black, white to white
and green to green. Tighten the wire nuts securely, making sure there are no
exposed wires.
4. Push the wires down into the wire box.
2.3 SAMPLE CONNECTIONS
The sample may be brought to the instrument with ¼" copper, stainless steel, or plastic tubing
and terminated in a ¼" female fitting.
Connect the sample supply line to the ¼" tubing fitting located on the top of the enclosure
(Figure 2.2).
NOTE: The maximum inlet pressure is 150 PSIG.
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Model RHB-CAC1
Dew Point Monitor
2.4 ALARM RELAY CONNECTIONS
When the programmed Alarm Set Point is exceeded, the alarm relay will be energized.
Before connecting any device to the Alarm Relay contacts, check the contact ratings in the
Specifications section.
1. Remove the Access Panel as in Figure 2-2.
2. Referring to Figure 2-3, feed the wires to be connected to the relay through the “signals out”
fitting on the bottom of the enclosure and up to the PCB connector, marked P2, “ALARM
RELAY”.
NOTE: To connect a wire to the terminal: loosen the screw, insert the wire in the
opening, and tighten the screw.
3. Connect one of the signal wires to the CA (Center Arm) and the other wire to either
the NO (Normally Open) or NC (Normally Closed) terminal.
4. Replace the Access Cover.
2.5 ANALOG OUTPUT CONNECTIONS
1. Remove the Access Panel as in Figure 2-2.
2. Referring to Figure 2-3, feed the wires to be connected to the analog output through the
‘signals out’ fitting on the bottom of the enclosure and up to the PCB connector, P1,
“4-20mA out”.
NOTE: To connect a wire to the terminal: loosen the screw, insert the wire in the opening,
and tighten the screw.
3. Connect the high signal wire to the “+” terminal and the low side to the “-“ terminal.
4. Replace the Access Cover.
2.6 RS232 SERIAL (Optional)
1. For hygrometers equipped with optional RS232 only. The RS232 is 2 wire, Simplex,
RS232 serial output, data is transmitted at an interval of 1/sec, and is space delimited.
The BAUD rate is fixed at 19.2kbps. The protocol is N81 (No Parity, 8 data bits, 1 stop bit).
The parameter sequence is “dew point ABC status.”
(example: ”xx.xC(or F)”” “’ABC on”)
2. For RS232 output connect to P11-1 for LO(-) and P11-2 for HI(+) located on the small
Pressure X-Ducer input/ Analog output/ RS232 PCB which is mounted parallel to the main
PCB.
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Model RHB-CAC1
Dew Point Monitor
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Model RHB-CAC1
Dew Point Monitor
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