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Maintenance
Since the temperature/humidity sensor is inspected and
calibrated for high accuracy at the factory before
shipment, no field calibration is necessary. Follow the
maintenance instructions below.
1) Periodic inspection
Determine the frequency of periodic inspection
depending on the amount of suspended dust and
other contaminants in the environment.
check the sensing accuracy and clean the cover.
2) Troubleshooting
If any problem occurs during operation, refer to the
following table for appropriate solutions.
Troubleshooting and Solution
Problems
Check items
• No output
• Loose wiring
• Disconnected
generated
• Unstable output
wiring
• Power supply
voltage
• Sensor damages
• Slow response to
• Moisture/conden-
output
sation on the
sensor
• Error in output
• Installed location
• Dust and
contamination on
the sensor
Specifications are subject to change without notice.
Building Systems Company
Tamachi Kiyota Building
4-3-4, Shibaura
Minato-ku, Tokyo 108-0023
http://www.yamatake.com
Rev. 2.1 Apr. 2005
(J: AI-6474 Rev. 2.1)
3) Humidity single-point calibration (Models HTY7043T,
Regulary
Solutions
• Re-perform wiring.
• Replace sensor.
• Remove cover.
Fig. 20
• Dry power-off
Cautions
state sensor in
clean air
1. Leave
seasoning.
• Refer to
'Installation
2. Be sure not to affect the sensor with heat generation
requirements'.
• Clean the cover.
• Perform humidity
single-point
calibration.
• Replace the
sensor.
16
16
HY7043T)
When you find an output error of the humidity sensor,
the sensor can be calibrated with the adjustment
knobs,VR1 for rough adjustment, VR2 for fine
adjustment, located inside the humidity sensor. The
output value is increased by turning these knobs
clockwise
and
decreased
counterclockwise.
Use a reliable measuring instrument for humidity
single-point calibration with correct procedure in
appropriate environment.
recommended to check the output voltage.
Rough adjustment knob (VR2)
Humidity sensing element
Adjustment knobs arrangement on the circuit board
the
unpacked
sensor
atmosphere for approx. 24 hours.
from human body and/or appliances during the sensor
calibration.
by
turning
them
A digital multimeter is
Fine adjustment knob (VR1)
Temperature sensing
element
in
the
ambient
AB-6474
AB-6474 0.5H-H (W00)
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