Setra SRH Operating Manual
Setra Model SRH
Relative Humidity Sensor Series
with Active or Passive Temperature Sensing
Installation Instructions
1.0 GENERAL INFORMATION
Every SRH humidity sensor product is tested and calibrated before shipment. Setra’s
Humidity Sensor family consists of a wall mount, duct mount, and outside air unit.
This product line expands the solution opportunities for the HVAC/building automation market and other relative humid ity monitoring applications. All models utilize
a fi eld-replaceable sensor module, NIST traceability, accuracies of ±2%, ±3%, ±5%,
active or passive temperature sensing, and a durable capacitive sensor capable of
full-scale 0 to 100% RH measurement.
2.0 MECHANICAL INSTALLATION
2.1 Environment
The operating temperature limits of the SRH model are as follows:
Operating Temperature Range -40°F to 140°F (-40 to 60°C)
Storage Temperature -40°F to 158°F (-40 to 70°C)
2.1 Wall Mount
It is important to fi nd a place within a room where the transmitter can be exposed to unrestricted air circulation that will represent the average humidity and
temperature within that space. Try to avoid any locations that may be exposed
to fumes, extreme temperatures, and high moisture content. Also, make sure the
location is on an indoor wall that is about 4 to 6 feet above the fl oor. For ease of
Model SRH
Wall Mount Unit
Top View
Security Screw
Security Latch
Front View
To open wall unit, back out the
security set screw (if used), then
press the security latch inward and
lift-up cover.
1
4.69
119
71.50
3.30
84
2.37
60
Wall Mount - Back Plate
2.81
1.41
36
in.
mm
2.2 Duct Mount
For proper operation, it is necessary to locate the transmitter in the center of a section of duct
that receives adequate air flow. Conversely, it must be free of fans, corners, heating/cooling
coils, or any other equipment/ environmentals that could adversely affect relative humidity
measurement.
2.69
68
Duct Mount Base
5.1
130
3.72
94
1.11
28
in.
mm
X2
0.180
5
Model SRH
Duct Unit
shown w/sensing probe
Insert sensing probe through hole (5/8” dia. minimum) and attach full assembly via
the two mounting holes on each side.
2.3 Outside Air Mount
The outside air configuration is supplied with a mounting bracket and two 10-16 x 1/2’ hex
head screws. Locate a position on the building that is clear of exhaust ducts, high exposure
to the sun, direct rain, or other outdoor factors that could adversely affect the operation of
the unit. Ideally, a sheltered area (under an eave) on the north side of the building is best to
protect from the above effects.
Model SRH
Outside Air Unit
shown w/Porous Weather
Shield
4.05
103
5.00
127
1.75
44
2.81
71
3.31
84
Outside Air Mounting Plate
2
X2
0.550
14
X8
0.325
8.3
X2
0.154
4
in.
mm
3.0 ELECTRICAL INSTALLATION
3.1 Wiring
Match your transmitter with the corresponding diagrams and set the jumpers and wire
accordingly. Ensure that all of the installation and wiring is in compliance with all national
and local codes. Use 18-22 AWG shielded, twisted pair, copper conductors.
Caution: Do not bundle transmitter wires with AC power wires. Shield must be connected to
earth ground for CE compliance.
Wall Mount
Connector/Jumper Locations - Inside cover
Duct and Outside Mount
Connector/Jumper Locations - Board Assembly/Duct Probe
3
Wiring 0-5 V/0-10 V Output Units (3-wire / T0, T1 & T2)
Shield
TH2
TH1 / +V_TMP
RTN_TMP/ +V_RH
RTN_RH / COM
+EXC
Note: Unit shipped in 0 to 5V Mode. Move jumper to right for 0 to 10V Operation
Wiring 4 to 20 mA Output Units (2-wire / T0, T1 & T2)
6 Earth Ground Connection
5
Thermistor/PRTD
4
3 RH (0 to 5V/0 to 10V) Output
2 Ground
1 Vin
Selectable Outputs
5V
10 V
H
Shield
TH2
TH1 / +V_TMP
RTN_TMP / +V_RH
RTN_RH / COM
+EXC
Wiring 0-5 V/0-10 V Output Units (4-wire / T3 & T5)
Shield
TH2
TH1 / +V_TMP
RTN_TMP/ +V_RH
RTN_RH / COM
+EXC
Selectable Outputs
5V
10 V
H
6 Earth Ground Connection
5
Thermistor/PRTD
4
3 NC
2 RH (4 to 20 mA) Output
1 Vin
6 Earth Ground Connection
5
NC
4
Active Tmp (0-5V/0-10V )Output
3 RH (0 to 5V/0 to 10V) Output
2 Ground
1 Vin
Selectable Tspan
5V
10 V
T
40
50
60
(°C)
Note: Unit shipped in 0 to 5V mode with Tspan set to 60°C. Move Tspan jumper to select
optional ranges.
4
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