Instruction Manual

Model HU-226
Technical Information
TI.226-05
HUMIDITY / TEMP SENSOR
Page 4 of 4
CHECKOUT DIMENSIONAL DATA
CALIBRATION
1. Verify that the unit is mounted in the correct position.
2. Verify appropriate input signal and supply voltage.
3. Verify appropriate configuration range.
CAUTION: Never connect 120 VAC to these transducers.
Never connect AC voltage to a unit intended for DC supply.
Transducer
Operation
Calibration of HU-226 mA/VDC Humidity Transducer
Field calibration instructions are provided with the following
precautions and advice:
1. Do not verify comparative RH with a sling Psychrometer.
There are far too many variables which induce errors into
this process. New HU-226 RH transducers are already
supplied with calibration.
2. Recalibration must be done in a controlled environment.
Relative humidity must be held stable while making any
adjustment.
3. Verify the output from the device directly with calibrated
instrumentation and verify the RH with calibrated instrumen-
tation, (NOT A CONTROLLER OUTPUT). With the correct
power applied and only a meter connected to the output of
the transducer, ensure that the output is proportional to the
true RH.
4. A) SINGLE POINT CALIBRATION:
[NOTE: SELECT EITHER OPTION 1 OR OPTION 2,
BUT NOT BOTH.]
Option 1. Select a controlled humidity environment
between 10 & 40% RH. Insure humidity
is stable and adjust zero trimmer (Z).
Option 2. Select a controlled humidity environment
between 40 & 70% RH. Insure humidity
is stable and adjust span trimmer (S).
B) TWO-POINT CALIBRATION: Select a controlled
humidity environment between 10 & 40% RH. Insure
humidity is stable and adjust zero trimmer (Z). Then
select a controlled humidity environment between
70 & 75% RH. Insure humidity is stable and then
adjust span trimmer (S).
All units are factory calibrated to meet or exceed published
specifications. If field adjustment is necessary, follow the
instructions below.
MAINTENANCE
Regular maintenance of the total system is recommended to
assure sustained optimum performance.
FIELD REPAIR
None. Replace with a functional unit.
WARRANTY
See Data Sheet for additional information.
Figure 6 - HU-226 Humidity Transducer Dimensions shown in inches and
millimeters (mm).
NOTE: The HU-226 is a highly accurate device. For
applications requiring a high degree of accuracy, the use of
laboratory-quality meters and gauges are recommended.
RoHS
TI.226-05
4.00”
(101.6)
2.63”
(66.8)
3.25”
(82.55)
2.81”
(71.37)
2.81”
(71.37)
5.00”
(127.0)
5.63”
(143.0)
.50”
(12.7)
2.00”
(50.8)
6.00”
(152.4)
For Technical / Application Assistance call your nearest office
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800-843-5116 • 952-556-4900 • Fax [phone]
[e-mail] • www.mamacsys.com
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Adelaide • S.A.
5088 • Australia
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CANADA
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East Tower • 6th Floor
Toronto • Ontario
L3R 0B8 • Canada
905-474-9215 • Fax [phone]
ASIA
1 Fullerton Road #02-01
One Fullerton
Singapore • 049213
65-31581826 • Fax [phone]
MAMAC Systems, Inc., reserves the right to change any specifications
without notice to improve performance, reliability, or function of our products.