Setra Systems SRH Manuel utilisateur
Model SRH
Operating Instructions
Setra Systems, Inc.
159 Swanson Road, Boxborough, MA 01719
800.257.3872 • www.setra.com
2
3
Table of Contents
1.0 General information ....................................................................................................... 4
2.0 Mechanical installation ................................................................................................ 4
2.1 Environment............................................................................................................... 4
2.2 Wall mount.................................................................................................................4
2.3 Duct mount ................................................................................................................ 5
2.4 Outside air mount...................................................................................................... 5
3.0 Electrical installation ..................................................................................................... 6
3.1 Wiring .........................................................................................................................6
4.0 Calibration ......................................................................................................................9
4.1 Remove/Install the sensor tip................................................................................... 9
4.2 Ordering information - replacement sensor assembly*........................................ 10
5.0 Specications...............................................................................................................11
6.0 Dimensional drawings .................................................................................................12
7.0 Duct mount installation ...............................................................................................13
8.0 Returning products for repair......................................................................................15
9.0 Warranty & limitation of liability..................................................................................15
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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 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)
2.2 Wall mount
It is important to 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 floor. For ease of mounting, the wall mount humidity transmitter was
designed to install onto a standard single gang electrical switch box or directly onto a wall.
Model SRH
Wall Mount Unit
2.81
71.50
3.30
84
4.69
119
1.41
36
Wall Mount - Back Plate
2.37
60
To open wall unit, back out the
security set screw (if used), then
press the security latch inward
and lift-up cover.
Security Latch
Security
Screw
Front View
Top View
in.
(mm)
5
Wall Mount - Back Plate
2.3 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. Insert sensing probe through hole (5/8” dia. minimum) and attach full
assembly via the two mounting holes on each side.
2.4 Outside air mount
The outside air conguration 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.
5.1
130
3.72
94
Model SRH
Duct Unit
shown w/sensing
probe
Duct mount base
1.11
28
X2
0.180
5
in.
mm
2.69
68
Outside air mounting plate
Model SRH
Outside air unit
shown w/porous weather shield
in.
mm
4.05
103
5.00
127
X2
0.550
14
2.81
71
3.31
84
1.75
44
X8
0.325
8.3
X2
0.154
4
6
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
7
Wiring 4 to 20 mA output units (2-wire / T1 & T2)
Wiring 4 to 20 mA to output units (2-wire / T0)
Shield
TH2
TH1
COM
+EXC
6 Earth ground connection
5
4
3 N/C
2 RH (4 to 20 mA) Output
1 Vin
Thermistor/ PRTD
Shield
COM
+EXC
6 Earth ground connection
5 N/C
4
3 N/C
2 RH (4 to 20 mA) Output
1 Vin
N/C
Wiring 0-5 V/0-10 V Output Units (3-wire / T0)
Wiring 0-5 V/0-10 V Output Units (3-wire / T1 &T2)
Shield
+V_RH
COM
+EXC
Shield
TH2
TH1
+V_RH
COM
+EXC
6 Earth ground connection
5 N/C
4
3 RH (0 to 5V/0 to 10V) Output
2 Ground
1 Vin
6 Earth ground connection
5
4
3 RH (0 to 5V/0 to 10V) Output
2 Ground
1 Vin
Note: Unit shipped in 0 to 5V Mode. Move jumper to right for 0 to 10V Operation
Note: Unit shipped in 0 to 5V Mode. Move jumper to right for 0 to 10V Operation
Selectable outputs
Selectable outputs
N/C
Thermistor/PRTD
5V
5V
10 V
10 V
H
8
Wiring 4 to 20 mA output units (3-wire / T3, T5)
Shield
+V_RH
COM
+EXC
6 Earth Ground Connection
5
4
3 Active TMP (4-20 mA) Output
2 RH (4 to 20 mA) Output
1 Vin
N/C
N/C
Note: Unit shipped with Tspan set to 60°C. Move Tspan jumper to select optional ranges.
40 50
60
Selectable Tspan
(°C)
Wiring 0-5 V/0-10 V output units (4-wire / T3 & T5)
Shield
+V_TMP
+V_RH
COM
+EXC
6 Earth ground connection
5
4
3 RH (0 to 5V/0 to 10V) Output
2 Ground
1 Vin
Note: Unit shipped in 0 to 5V mode with Tspan set to 60°C. Move Tspan jumper to select
optional ranges.
Selectable outputs
N/C
Active Tmp (0-5V/0-10V )Output
5V 10 V
T
5V 10 V
H
40 50
60
Selectable Tspan
(°C)
9
4.0 Calibration
All relative humidity products are fully tested and calibrated prior to shipment in accordance
with the National Institute of Standards and Technology (NIST), the highest quality standard
available.
Once installed in the eld, no calibration of the units is required. Instead, this product suite
features eld-replaceable sensor modules that allow the end user to replace the sensors on-
site. This eliminates time consuming and costly factory calibration, while reducing downtime
during service intervals. Additionally, the duct mount probe is easily accessed by taking off the
front cover, removing the sensor board assembly, and replacing the sensor module on the tip
of the sensor board. This further contributes to a more user-friendly, lower cost product line
that is focused on customer needs and ease of use.
4.1 Remove/Install the sensor tip
Note: Power Must be removed from the main PCBA prior to replacing the sensor tip module.
Failure to comply could possibly damage the sensor tip module
Wall mount
Outdoor and duct mount
White
retaining clip
10
Replaceable sensor with sintered lter
Remove the white retaining clip (shown above and on page 6). Remove the sensor tip module
by holding the sides of the sintered lter along the pcb edges. Then gently pull the sensor tip
module out of the mating connector. Gently push the replacement sensor tip module into the
mating connector (as shown) and replace the retaining clip to secure the connection.
Top view
Side view
(PCB to PCB)
4.2 Ordering information - replacement sensor assembly*
Model Accuracy Temperature outputs
SRH3 = SRH 2P = 2% T0 = None (RH only)
3P = 3% T1 = 10KΩ NTC (passive)
5P = 5%** T2 = 1000Ω RTD (passive)
T3 = -50°C to 60°C (active)
T5 = -10°C to 60°C (active)
T6 = 10K Ω NTC (passive)
S R H 3
Example: Order Part No. SRH3-2P-T0 = Sensor Assembly with 2% accuracy, RH only.
White
retaining clip
*SRH1 units originally ordered with either a T3 or T5 temperature option MUST be replaced
with the same T(x) version.
**Not available with T3 or T5 option.
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