Dwyer RHP Series Temperature/Humidity Transmitter Instruction Manual
- June 3, 2024
- Dwyer
Table of Contents
Series RHP Temperature/Humidity Transmitter
Specifications – Installation and Operating Instructions
Bulletin E-90-RHP
RHP Series Temperature/Humidity Transmitter
The Series RHP Humidity and Temperature Transmitter offers flexibility, high
accuracy, long term stability, and reliable operation. Utilizing the duct and
outside air mounting configurations, the Series RHP monitors and controls
humidity or both humidity and temperature in a building energy management
systems, commercial and residential HVAC applications, clean rooms, museums,
and climate chambers.
The Series RHP can be ordered with a single current or voltage output for
humidity or can be factory configured to have an additional current, voltage,
or passive RTD or thermistor temperature output. The optional display for the
duct mount models allows the user to read both the temperature and humidity
simultaneously.
NOTICE
For best results, our model RHRS radiation shield is recommended for sintered
filter versions of the outside air transmitter.
NOTICE
Sensor is sensitive to Electro-Static Discharge (ESD). Follow industry
standard practice for control and protection against ESD.
Failure to exercise good ESD practices may cause damage to the sensor.
SPECIFICATIONS
Relative Humidity Range: 0 to 100% RH.
Temperature Range: -40 to 140°F (-40 to 60°C).
Accuracy, RH: RHP-2XXX ±2% 10-90% RH @ 25°C; RHP-3XXX ±3% 20-80% RH@ 25°C;
RHP-5XXX ±5% 20-80% RH @ 25°C.
Accuracy, Thermistor Temp Sensor: ±0.2°C @ 25°C (±0.36°F @ 77°F).
Accuracy, RTD Temp Sensor: DIN Class B; ±0.3°C @ 0°C (±0.54°F @ 32°F).
Accuracy, Solid State Band Gap: ±0.9°F @ 77°F (±0.3°C @ 25°C).
Hysteresis: ±1%.
Repeatability: ±0.1% typical.
Temperature Limits: -40 to 140°F (-40 to 60°C).
Storage Temperature: -40 to 176°F (-40 to 80°C).
Compensated Temperature Range: -4 to 140°F (-20 to 60°C).
Power Requirements: 4-20 mA loop powered models: 10-35 VDC; 0-5/10 V output
models: 15-35 VDC or 15-29 VAC.
Output Signal (Model Dependent): 4-20 mA; 0-5/10V @ 5 mA max.
Solid State Band Gap Temperature Sensor Output Ranges: Switch selectable, -20
to 140°F (-28.9 to 60°C); 0 to 100°F (-17.8 to 37.8°C); 40 to 90°F (4.4 to
32.3°C); -4 to 140°F (-20 to 60°C).
Response Time: 15 s.
Electrical Connections: Removable screw terminal block.
Conduit Connection: Duct mount: 1/2˝ NPS; OSA: 1/2˝ (22.3 mm).
Drift: <1% RH/year.
RH Sensor: Capacitance polymer.
Temperature Sensor: Types 1, 2, 3: Solid state band gap; Curves A, B, C:
Thermistor; Curves D, E: Platinum RTD DIN 385.
Enclosure Material: Duct mount sensor tube: PVC-UL 94 V-0; Duct mount sensor
cap: Polycarbonate ABS blend-greater than UL 94 V-0; Duct mount electronics
housing and cover: Makrolon® polycarbonate-UL 94V-HB; OSA: Polycarbonate.
Enclosure Rating: Duct mount: NEMA 4X (IP66) for housing only; OSA: NEMA 4X
(IP66).
Display: Duct mount only, optional 2-line alpha numeric, 8 characters/line.
Display Resolution: RH: 0.1%; 0.1°F (0.1°C).
Weight: Duct mount: .616 lb (.3 kg); OSA: 1 lb (.45 kg).
Agency Approvals: CE.
INSTALLATION
WARNING
Disconnect power supply before installation to prevent electrical shock and
equipment damage.
Make sure all connections are in accordance with the job wiring diagram and in
accordance with national and local electrical codes. Use copper conductors
only.
CAUTION
Use electrostatic discharge precautions (e.g., use of wrist straps) during
installation and wiring to prevent equipment damage.
Avoid locations where severe shock or vibration, excessive moisture or
corrosive fumes are present. NEMA Type 4X (IP65) housings are intended for
outdoor use primarily to provide a degree of protection against wind-blown
dust, rain, and hosedirected water.
Do not exceed ratings of this device, permanent damage not covered by warranty
may result. The 4-20 mA models are not designed for AC voltage operation.
Duct Mount
The transmitter should be mounted away from fans, corners, heating and cooling
coils, and other equipment that will effect the measurement of the relative
humidity. It should also be mounted in a location that receives adequate air
flow for proper operation.
The transmitter should be mounted such that the conduit connection points down
to prevent moisture from entering.
- Drill a 1˝ diameter hole into the duct at the desired location.
- Insert the transmitter probe through the hole such that the mounting flange is flush to the duct.
- Use three #8 x 1/2˝ pan head sheet metal screws to attach the mounting flange to the duct. Do not over tighten.
- Remove top screw cover to access wiring terminals.
OSA (Outside Air)
The transmitter should be mounted under an eave, shield, or in an area that is
out of the elements or direct sunlight. The transmitter should be mounted with
the sensor
pointing down to prevent water collection in the sensor cavity.
- Remove the cover plugs from the face of the unit and the top cover.
- Position the transmitter where it is to be mounted and mark the mounting holes in each corner of the housing.
- Drill or punch out marked locations.
- Place the transmitter box over mounting holes on wall and align. Install wall mount screws (not provided) in mounting holes.
- Proceed with wiring according to Figure 1.
- Replace cover and cover plugs on the face of the unit.
WIRING
Use maximum 18 AWG wire for wiring terminals. Refer to Figure 1 or Figure 2
for wiring information. Terminal blocks are removable for ease of wiring.
4-20 mA Output Models with Thermistor, RTD or No Temperature Sensor
4-20 mA output units may be powered with a 10-35 VDC supply. (Wire as shown in
Figure 1).
Figure 1
Dual 4-20 mA RH/Temperature Output Models
Dual 4-20 mA output units may be powered with a 10-35 VDC supply. The
following describes the proper wiring of these transmitters: The model RHP
transmitter with dual 4-20 mA output is designed as a 2-wire 4-20 mA device
with two channels. The channels are common on the positive side of the current
loop. Sensor excitation power is derived from the RH channel, so power must
always be applied to that channel. If the temperature channel is not used, it
can be left disconnected. Wire as shown in Figure 2.
Figure 2
Note: If the RH output is not required, wire the “-” terminal of the
power supply to terminal 1.
0-5 V and 0-10 V Output Models with Thermistor, RTD, or No Temperature Sensor
The 0-5 V and 0-10 V output models may be powered with 15-35 VDC or 15-29 VAC.
Note polarity when using DC power. The maximum load is 5 mA. Wire as shown in
Figure 3.
Figure 3
Dual 0-5 V and 0-10 V RH/Temperature Output Models
Dual 0-5 V and 0-10 V output units may be powered with 15-35 VDC or 15-29 VAC.
Note polarity when using DC power. The channels are common on the negative
side.
If desired, the RH or, temperature output may be used by itself. Wire as shown
in Figure 4.
Figure 4
DISPLAY
The temperature indicated on the display, if equipped with the LCD option, is
field selectable via a jumper located on the circuit board. Position the
jumper for °F or °C according to Figure 5.
Figure 5
Note: The display will indicate temperature even if the unit does not have a temperature output.
TROUBLESHOOTING
- Verify that the unit is mounted in the correct position.
- 4-20 mA Models:
Verify appropriate supply voltage. The transmitter requires a minimum of 10 and a maximum of 35 VDC at its connection for proper operation. Choose a power supply with a voltage and current rating which meets this requirement under all operating conditions. If the power supply is unregulated, make sure voltage remains within these limits under all power line conditions. Ripple on the supply should not exceed 100 mV.
Loop Resistance – The maximum allowable loop resistance depends on the power supply voltage. Maximum loop voltage drop must not reduce the transmitter voltage below the 10 VDC minimum. Maximum loop resistance can be calculated with the following equation. Vps is the power supply voltage.
Some receivers, particularly loop powered indicators, may maintain a fixed loop voltage to power the device. This voltage drop must also be subtracted from the power supply voltage when calculating the voltage margin for the transmitter. The following equation takes this into account. Vrec is the receiver fixed voltage.
0-5 V and 0-10 V Output Models:
Verify appropriate supply voltage. The 0-5 V and 0-10 V output models require
a DC supply of 15-35 V or an AC supply of 15-29 V for proper operation
maximum. Maximum output load is 5 mA.
FIELD SENSOR REPLACEMENT
Replacement sensors are available for OSA sintered filter models (RHP-XSXX)
and duct mount models manufactured before February 2015. Sensor covers are
also available. Please contact Dwyer technical support for additional details.
MAINTENANCE
Upon final installation of the Series RHP Temperature/Humidity Transmitter and
the companion receiver, no routine maintenance is required. A periodic check
of the system calibration is recommended. The Series RHP is not field
serviceable and should be returned if repair is needed (field repair should
not be attempted and may void warranty). Be sure to include a brief
description of the problem plus any relevant application notes. Contact
customer service to receive a return goods authorization number before
shipping.
This symbol indicates waste electrical products should not be disposed of with
household waste. Please recycle where facilities exist. Check with your Local
Authority or retailer for recycling advice.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone:219-879-8000
Fax:219-872-9057
www.dwyer-inst.com
e-mail:info@dwyermail.com
©Copyright 2021 Dwyer Instruments, Inc.
Printed in U.S.A. 7/21
FR# 443637-00 Rev. 12
Documents / Resources
|
Dwyer RHP Series Temperature/Humidity
Transmitter
[pdf] Instruction Manual
RHP Series Temperature Humidity Transmitter, RHP Series, Temperature
Transmitter, Humidity Transmitter, Transmitter, Temperature Humidity
Transmitter
---|---
|
Dwyer RHP Series Temperature/Humidity
Transmitter
[pdf] Instruction Manual
RHP Series Temperature Humidity Transmitter, RHP Series Temperature
Transmitter, RHP Series Humidity Transmitter, Temperature Transmitter,
Humidity Transmitter, Transmitter, Bulletin E-90-RHP
References
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