Dwyer Instruments RHP-2N44, RHP-3N44, RHP-3N40 User manual

Bulletin AQ-RHP-E/N

1.10

[1

[90.42]

®

Series RHP-E/N Wall Mount Humidity/Temperature/Dew Point Transmitter

Specications - Installation and Operating Instructions

European style

The Series RHP-E/N Wall Mount Humidity/Temperature/Dew Point Transmitter is
the most versatile room transmitter on the market. The stylish housing is well vented

to provide air ow across the sensor to improve measurement accuracy. An optional
LCD display can be integral to the transmitter or a remote display can be ordered
for building balancing or LEED

temperature along with the humidity or dew point. The transmitter has internal dip

switches to select the temperature engineering units and whether the transmitter

outputs humidity or dew point.

The humidity and the dew point are measured using a capacitive polymer sensor
that completely recovers from 100% saturation. The humidity and dew point can
have either a current or voltage output, while the optional temperature output can
be a current, voltage, RTD or thermistor. For models with current or voltage for the
temperature output, the temperature range is eld selectable.

INSTALLATION

CAUTION

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.

NOTICE

The sensor is particularly sensitive to electric shock.

NOTICE

NOTICE

designed for AC voltage operation.

Disconnect power supply before installation or maintenance.
Failure to do so may result in equipment damage.

Use electrostatic discharge precautions (e.g., use of wrist straps)
during installation and maintenance to prevent equipment damage.

Avoid locations where severe shock or vibration, excessive
moisture, or corrosive fumes are present.

Do not exceed ratings of this device; permanent damage not
covered by warranty may result. The 4-20 mA models are not

®

validation. The LCD display indicates the ambient

North American style

2x .176

[4.47]

.573

[14.56]

.33

[8.38]

3x .37
[9.36]

.552

[14.02]

1.18
[30]

3.000

[76.20]

1.16

[29.39]

3x .15
[3.87]

[27.96]

4.50

14.30]

2.80

[71.12]

3.65

[92.72]

SPECIFICATIONS
Relative Humidity Range: 0 to 100% RH.
Temperature Range: -40 to 140°F (-40 to 60°C) for thermistor and RTD sensors.

-20 to 140°F (-28.9 to 60°C) for solid state band gap temperature sensors.
Dew Point Temperature Range: -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) eld-selectable

ranges.

Accuracy: RH: Model RHP-2XXX ±2% 10 to 90% RH @ 25°C; Model RHP­3XXX ±3% 20 to 80% RH @ 25°C; Model RHP-5XXX ±5% 20 to 80% RH @
25°C; Thermistor temperature sensor: ±0.36°F @ 77°F (±0.2°C @ 25°C); RTD
temperature sensor: DIN Class B; ±0.54°F @ 32°F (±0.3°C @ 0°C); Solid state
band gap temperature sensor: ±0.9°F @ 77°F (±0.3°C @ 25°C).

Hysteresis: ±0.8%.
Repeatability: ±0.1% typical.
Temperature Limits: Operating: -40 to 140°F (-40 to 60°C); Storage: -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 outputs: 10-35 VDC; 0-5/10V

outputs: 15-35 VDC or 15-29 VAC.
Output Signals: 4-20 mA loop powered outputs: 4-20 mA, 2 channels for humidity/
solid state temperature sensor models (loop powered on RH). Switch selectable
RH/dew point. Switch selectable normal or reverse output; 0-5/10V outputs: 5
mA max., 2 channels for humidity/solid state temperature sensor models. Switch
selectable 0-10 V/2-10 V or 0-5 V/1-5 V output. Switch selectable RH/dew point.
Switch selectable normal or reverse output.
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: 8 s.
Electrical Connections: Screw terminal block.
Drift: <0.25% RH/year.
RH Sensor: Capacitance polymer.
Enclosure Material: Polycarbonate.
Enclosure Rating: IP20.
Display: Optional LCD; Switch selectable %RH or dew point, °F/°C.
Display Resolution: RH: 1%; Temperature: 0.1°F (0.1°C); Dew point: 1°F (1°C).
Weight: 4.4 oz (125 g).
Agency Approvals: CE.

North American style

1.08

[27.33]

3.56

European style

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Voltage Output Selected: Voltage outputs may be powered with 15-35 VDC or 15-29

H

DIP

VAC. Note polarity when using DC power. Wire the RH voltage output as shown in
Figure 3. If the unit has a voltage temperature output, wire the temperature receiver
between terminal 6 and the negative terminal of the power supply. All units come with
RH and Temperature voltage outputs. If the temperature or RH voltage output is not
used it may be left disconnected. If the unit has a passive temperature sensor, wire to
terminals 7 and 8.

POWER
SUPPLY

+ -+ -

Figure 1

1. Push tab on top and bottom of the back plate and lift the cover from the back plate.
(See Figure 1).

2. Select the mounting location, away from diffusers, lights, or any external
inuences.

3. Mount transmitter on a vertical surface to a standard electrical box using the two
#6 M2C type screws provided.

4. Pull wires through the sub base hole and make the necessary connections.

5. Reattach cover to back plate.

Wiring

Use maximum 18 AWG wire for wiring to terminals. Refer to Figures 2 and 3 for wiring

information.

Models with Selectable Current or Voltage Outputs (RHP-X(E or N)44)

These models may be wired for current or voltage output. Note that both outputs must
be wired either for current or voltage. It is not possible to wire one output for current,

and the other for voltage.

Prior to wiring, verify that the Current/Voltage select switch shown in Figure 4 is set
to current or voltage as desired. Refer to “Setting the Current/Voltage Select Switch”.

Current Output Selected: Wire as shown in Figure 2. Current outputs must be
powered with 10-35 VDC. If the RH output is not required, wire the negative terminal
of the power supply to terminal 1 of the transmitter. All units come with 4-20 mA RH
and Temperature outputs. If the 4-20 mA temperature output is not used it maybe left
disconnected. If the unit has a passive temperature sensor, wire to terminals 7 and 8.

POWER
SUPPLY

+ -+ -

RH RECEIVER
0-5 V OR 0-10 V

-

+

1 2 3 4 5 6 7 8

--

TEMP RECEIVER

++

0-5 V OR 0-10 V

PASSIVE TEMP.
SENSOR
(IF PRESENT)

Figure 3

Setting the Current/Voltage Select Switch

Remove the cover of the unit as shown in Figure 1. The Current/Voltage select switch
is located on the back of the circuit board. Set the switch “IOUT” for current, “VOUT”

for voltage.

SWITCH SETTINGS

CURRENT VOLTAGE SELECT SWITC

Figure 4

RH RECEIVER
4-20 mA

--

++

--

++

1 2 3 4 5 6 7 8

Figure 2

TEMP RECEIVER
4-20 mA

PASSIVE TEMP.
SENSOR
(IF PRESENT)

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DIP SWITCH SETTINGS

To access the DIP SWITCH, remove the cover of the unit as shown in Figure 1. The
DIP SWITCH is located on the back of the circuit board as shown in Figure 4.

Figure 5

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.

ALL DIP SWITCHES are factory set to “ON”

5 V/10 V Output Select (Applies only to Voltage Output units)

DIP SWITCH#1 OFF: Output = 0-5 V
DIP SWITCH#1 ON: Output = 0-10 V

Zero Suppression (Applies only to Voltage Output Units)

DIP SWITCH#2 OFF : Output range = 1-5 V or 2-10 V, depending on output range
DIP SWITCH#2 ON : Output range = 0-5 V or 0-10 V, depending on output range

Upper Display reads RH or DEW POINT

DIP SWITCH#3 OFF: Upper Display reads Dew Point
DIP SWITCH#3 ON: Upper Display reads RH

RH OUTPUT, Normal or Invert

DIP SWITCH#4 OFF: Output is inverted
DIP SWITCH#4 ON: Output is Normal

When set to normal output, the output increases as the RH increases. When set to
inverted output, the output decreases as the RH increases.
Example: Normal 4-20 mA output, 0% RH = 4 mA, 100% RH = 20 mA
Inverted 4-20 mA output, 0% RH = 20 mA, 100% RH = 4 mA

TEMP OUTPUT, Normal or Invert

DIP SWITCH#5 OFF: Output is inverted
DIP SWITCH#5 ON: Output is Normal

When set to normal output, the output increases as the temperature increases. When
set to inverted output, the output decreases as the temperature increases.
Example: Normal 4-20 mA output, -20°F = 4 mA, +140°F = 20 mA
Inverted 4-20 mA output, -20°F = 20 mA, +140°F = 4 mA

°F/°C Select

DIP SWITCH#6 OFF: °C
DIP SWITCH#6 ON: °F

-10.0

ps

V

Rmax =

20 mA

Some receivers, particularly loop powered indicators, may maintain a xed 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 xed voltage.

-10.0-V

Vps

Rmax =

0-10 V Output Models:

Verify appropriate supply voltage. The 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.

Remote Display

For models that are ordered without an integral LCD display, remote display Model
A-449 or A-449A can be used to display the temperature and humidity or dew point.
The mini USB plug of the remote display plugs into the receptor on the side of
the housing. After a short warm up time, the display will begin to show the current
temperature and humidity or dew point measurements. Humidity or dew point can be
selected via the internal dip switches as described earlier in this manual.

rec

20 mA

TEMPERATURE OUTPUT RANGE SELECT
Range Dip Switch 7 Dip Switch 8

-4 to +140°F (-20 to +60°C)
+40 to +90°F (+4.4 to +32.2°C)
0 to +100°F (-17.8 to +37.8°C)

-20 to +140°F (-28.9 to +60°C)

The temperature range applies only to the current or voltage output. If the unit has
a display, it will display temperature from -40 to +140°F (-40 to +60°C). If the unit is
set to read DEW POINT, the output range of the DEW POINT will be the same as the
Temperature Output Range.

Note: The display will indicate temperature even if the unit does not have a temperature

output.

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OFF
OFF
ON
ON

OFF
ON
OFF
ON

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MAINTENANCE

Upon nal installation of the Series RHP-E/N Temperature/Humidity/Dew Point
Transmitter and the companion receiver, no routine maintenance is required. A periodic
check of the system calibration is recommended. Except for sensor replacement, t he
Series RHP-E/N is not eld serviceable and should be returned if repair is needed
(eld 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.

MODEL CHART
Example RHP 2 N 4 A LCD RHP-2N4A-LCD

Series RHP RH/passive temperature sensor

Accuracy 2

Housing

Type

RH Output 4 0-10 V/0-5 V/4-20 mA

Temperature
Sensor/

Output

Option Blank

3

5

N
E

A
B

C
D

E
F
0

4

transmitter

2% accuracy
3% accuracy
5% accuracy
North American wall mount
European wall mount

10K @ 25°C thermistor Dwyer curve A
10K @ 25°C thermistor Dwyer curve B
3K @ 25°C thermistor Dwyer curve C
100Ω RTD DIN 385
1KΩ RTD DIN 385
20KC 25°C thermistor curve F
NONE
0-10 V/0-5 V/4-20 mA solid state sensor
No options

LCD

LCD display

FC

Factory test report

NIST

NIST calibration test certicate

RESISTANCE VS TEMPERATURE TABLE

Temperature Resistance Curves (in Ω)
°C °F A B C D E F

-55

-67.0

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150

-58.0

-49.0

-40.0

-31.0

-22.0

-13.0

-4.0

5.0

14.0

23.0

32.0

41.0

50.0

59.0

68.0

77.0

86.0

95.0

104.0

113.0

122.0

131.0

140.0

149.0

158.0

167.0

176.0

185.0

194.0

203.0

212.0

221.0

230.0

239.0

248.0

257.0

266.0

275.0

284.0

293.0

302.0

607800.00

441200.00

323600.00

239700.00

179200.00

135200.00

102900.00

78910.00

61020.00

47540.00

37310.00

29490.00

23460.00

18780.00

15130.00

12260.00

10000.00

8194.00

6752.00

5592.00

4655.00

3893.00

3271.00

2760.00

2339.00

1990.00

1700.00

1458.00

1255.00

1084.00

939.30

816.80

712.60

623.60

547.30

481.80

425.30

376.40

334.00

297.20

265.10

237.00

963849.00

670166.00

471985.00

336479.00

242681.00

176974.00

130421.00

97081.00

72957.00

55329.00

42327.00

32650.00

25392.00

19901.00

15712.00

12493.00

10000.00

8057.00

6531.00

5326.00

4368.00

3602.00

2986.00

2488.00

2083.00

1752.00

1480.00

1255.00

1070.00

915.50

786.60

678.60

587.60

510.60

445.30

389.60

341.90

301.00

265.80

235.30

208.90

186.10

289154.70

201049.80

141595.50

100943.70

72804.30

53092.20

39126.30

29.124.30

21887.10

16598.70

12698.10

9795.00

7617.60

5970.30

4713.60

3747.90

3000.00

2417.10

1959.30

1597.80

1310.40

1080.60

895.80

746.40

624.90

525.60

444.00

376.50

321.00

274.65

235.98

203.58

176.28

153.18

133.59

116.88

102.57

90.30

79.74

70.59

62.67

55.83

78.32

80.31

82.29

84.27

86.25

88.22

90.19

92.16

94.12

96.09

98.04

100.00

101.95

103.90

105.85

107.79

109.74

111.67

113.61

115.54

117.47

119.40

121.32

123.24

125.16

127.08

128.99

130.90

132.80

134.71

136.61

138.51

140.40

142.29

144.18

146.07

147.95

149.83

151.71

153.58

155.46

157.33

783.2

803.1

822.9

842.7

862.5

882.2

901.9

921.6

941.2

960.9

980.4

1000.0

1019.5

1039.0

1058.5

1077.9

1097.4

1116.7

1136.1

1155.4

1174.7

1194.0

1213.2

1232.4

1251.6

1270.8

1289.9

1309.0

1328.0

1347.1

1366.1

1385.1

1404.0

1422.9

1441.8

1460.7

1479.5

1498.3

1517.1

1535.8

1554.6

1573.3

2394000.00

1646200.00

1145800.00

806800.00

574400.00

413400.00

300400.00

220600.00

163.500.00

122280.00

92240.00

70160.00

53780.00

41560.00

32340.00

25360.00

20000.00

15892.00

12704.00

10216.00

8264.00

6722.00

5498.00

4520.00

3734.00

3100.00

2586.00

2166.00

1822.60

1540.00

1306.40

1112.60

951.00

815.80

702.20

606.40

525.60
N/A
N/A
N/A
N/A
N/A

®

is a registered trademark of the U.S. Green Building Council.

LEED

Printed in U.S.A. 7/21 FR# 444141-00 Rev. 5©Copyright 2021 Dwyer Instruments, Inc.

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