GREYSTONE HAHRC Series High Accuracy Room Relative Humidity Transmitter Instruction Manual
- June 9, 2024
- Greystone
Table of Contents
GREYSTONE HAHRC Series High Accuracy Room Relative Humidity Transmitter
Instruction Manual
INTRODUCTION
The high accuracy room RH transmitter uses a highly accurate and field-proven RH sensor in an attractive, low profile enclosure to monitor room relative humidity levels. Additional options include an occupancy override button, a slide-pot setpoint control, a resistive temperature sensor and an LCD display. The RH output can be selected as a linear 4-20 mA, 0-5 or 0-10 Vdc signal.
BEFORE INSTALLATION
Read these instructions carefully before installing and commissioning the device. Failure to follow these instructions may result in product damage. Do not use in an explosive or hazardous environment, with combustible or flammable gases, as a safety or emergency stop device or in any other application where failure of the product could result in personal injury. Take electrostatic discharge precautions during installation and do not exceed the device ratings.
MOUNTING
The high accuracy room RH transmitter installs directly on a standard electrical box and should be mounted five feet from the floor of the area to be controlled. Do not mount the sensor near doors, opening windows, supply air diffusers or other known air disturbances. Avoid areas where the detector is exposed to vibrations or rapid temperature changes.
The cover is hooked to the base at the top edge and must be removed from the
bottom edge first. Use a small Phillips screwdriver to loosen the security
screw as shown in Figure 1. (Complete removal of this screw is not
required). Use the screwdriver to carefully pry each bottom corner if
necessary. Tip the cover away from the base and sit it aside as shown in
Figure 2
The PCB must be removed from the base to access the mounting holes. Follow
usual anti-static procedures when handling the PCB and be careful not to touch
the sensors. The PCB is removed by pressing the enclosure base to unsnap the
latch near the bottom edge, then the PCB can be lifted out of the base as
shown in Figure 3.
Sit the PCB aside until the base is mounted on the wall. For added protection, place the PCB in the supplied anti-static bag.
Mount the base by screwing to an electrical box or directly to the wall as shown in Figure 4. The mounting hole locations are shown on page 3.
After the base is screwed to an electrical box or the wall using the
appropriate holes, remove the PCB from the anti-static bag, feed connection
wires through center hole and place the top of PCB into the PCB holders on
backplate and snap bottom of PCB into place as shown in Figure 4.
Make wire connections as per the Wiring Illustrations on Page 2 and install decorative cover by placing the top of the cover into the cover holder on the top of the backplate and snapping the bottom into place as shown in Figure 4. Tighten security screw with a Phillips screwdriver.
WIRING
Deactivate the 24 Vac/dc power supply until all connections are made to the device to prevent electrical shock or equipment damage. Follow proper electrostatic discharge (ESD) handling procedures when installing the device or equipment damage may occur.
Use 22 AWG shielded wiring for all connections and do not locate the device wires in the same conduit with wiring used to supply inductive loads such as motors. Connect the cable shield to ground at the controller only. Make all connections in accordance with national and local codes.
Connector layout is shown in Figure 5. Diagram shown includes all options.
If option is not ordered, connector will not be present.
For 4-20 mA two-wire loop-powered operation, only the POWER and OUTPUT terminals are required if a DC power supply is used. The COMMON terminal is only used for AC power or for a voltage output signal type. If the signal type is set to voltage, or a 24 volt AC power supply is used, connect the positive dc voltage or the hot side of the ac voltage to the terminal marked POWER and the power
supply common is connected to the terminal marked COMMON. The device is reverse voltage protected and will not operate if connected backwards.
For three-wire voltage output operation, connect either an AC or DC power
supply to POWER and COMMON and the voltage output signal is available on the
OUTPUT terminal with respect to COMMON as shown in Figure 6.
This device has a half-wave power supply so the power supply common is the same as the signal common. Several devices may be connected to one power supply and the output signals all share the same common. Use caution when grounding the secondary of a transformer or when wiring multiple devices to ensure the ground point is the same on all devices and the controller.
The following optional features are only included if ordered. Wiring terminals are only present for features ordered.
An optional resistive temperature sensor may also be included in the device
and is connected to the TEMP terminals as shown in Figure 7.
An optional resistive slide-pot setpoint output signal is available on the
SETPNT + and SETPNT – terminals and can be configured with various resistance
values and the operation can be set for forward or reverse acting as shown in
Figure 8.
An optional override switch output is a dry-contact and is available on the
SWITCH + and SWITCH – terminals and typically connects to a low voltage
digital input of the controller to indicate room occupancy or override when
the button is activated as shown in Figure 9.
START-UP
Verify that the transmitter is properly wired, connections are tight and the
mA / Vdc switch is in the correct position as shown in Figure 10. For
voltage output, also ensure the 5V / 10V switch is set correctly for the
required signal type as shown in Figure 11. Apply power and note that the
LCD will begin displaying the RH level (if installed). The output signal will
also be available immediately after start-up
OUTPUT SIGNAL
The RH output is scaled such that 4-20 mA (or 0-5 or 0-10 Vdc) equals 0-100
%RH and is temperature compensated over the full 0-50 °C temperature range.
DIMENSIONS
SPECIFICATIONS
Sensor:……………………………………………..Thermoset polymer based capacitive
Accuracy: …………………………………………±1.5% or 2% (5 to 95 %RH)
Range:………………………………………………0 to 100 %RH
Resolution: ………………………………………0.01 %RH
Hysteresis: ……………………………………….±0.8 %RH @ 25°C (77°F)
Response Time: ………………………………8 seconds typical
Stability: …………………………………………..<0.25 %RH/year
Power Supply:…………………………………24 Vac/dc ±10% typical, 28 Vac/dc maximum
Consumption: …………………………………20 mA @ 24 Vdc
Output Drive @ 24 Vdc: …………………Current: 550 Ω maximum
Voltage: 10,000 Ω minimum
Operating Conditions: …………………..0 to 50°C (32 to 122°F)
Enclosure:………………………………………..White ABS, IP30 (NEMA 1)
84mm W x 119mm H x 29mm D
(3.3” x 4.7” x 1.15”)
Wiring Connections:………………………Screw terminal block (14 to 22 AWG)
Optional Temp Sensor: ………………….Various Thermistors and RTDs
available as 2 wire resistive output
Optional Setpoint Adjustment:……Type: Front panel slide pot, 2 wire
resistance output
Range: 0K to 10K standard
Custom Spans Available: 1K, 2K, 5K, 10K, or 20K Ω
Optional Manual Override: …………..Type: Front panel, momentary pushbutton
Ratings: 50 mA @ 12 Vdc, N.O., SPST
Optional LCD Display:………….Range: 00.0 to 99.9 %RH, 3 digit
Size: 38.1mm W x 16.5mm H (1.5” x 0.65”)
Digit Height: 11.43mm (0.45”)
Symbols: %RH
Country of Origin:………Canada
NOTE: The sensor accuracies listed in the specifications section apply to the sensing element only prior to product assembly and may not be reflected in the complete assembly.
Due to the measurement uncertainty, it is possible, that the true resistance value of the single delivered sensor at 0°C can be out of the defined tolerance class. Profiling each assembly to take into consideration lead wire and the attachment method should be completed.
IN-GE-HAHRCXXX-03
Copyright © Greystone Energy Systems, Inc. All Rights Reserved Phone: +1 506 853 3057 Web: www.greystoneenergy.com
References
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