Doc.Ref.No.:m97/om/302
Issue No.:05
Page | 6
HT7S Series
The following guidelines should guarantee good
instrument performance:
Select a representative location: install the probe where
humidity, temperature and pressure conditions are
representative of the environment to be measured.
Provide good air movement at the probe: air velocity of
at least 200 ft/ minute (1 meter/second) facilitates
adaptation of the probe to changing temperature.
Immerse as much of the probe as possible in the
environment to be measured.
Prevent the accumulation of condensation water at the
level of the sensor leads. Install the probe so that the
probe tip is looking downward. If this is not possible,
install the probe horizontally.
The serial no. & calibration code of the sensor:
The small PCB name called sensor extension card that
is placed over the main card or motherboard or signal
conditioner card through 2-row 3-pin connector. The
serial number and calibration code of the PCB can be
seen at the backside of the sensor extension card that
have unique 6 digits code for both sensor identification
and easy customer calibration of transmitter or signal
conditioner card. The first number is sensor serial code
and second number is calibration code.
Calibration Code: The first three digit number
represents code for 0 %RH value and last three digits
number represents code for 75.3 %RH. For eg:
Calibration code: 837136. The actual sensor output
voltage at 0 %RH = 0.837 V (First three Digits: 837) and
at 75.3 % RH = 3.136 V (Last Three Digits: 136). Based
on the given two points, you can calculate the sensor
output voltage at 100 % RH it is approximately 3.891V
by extrapolation technique which is used for calibration
purpose only. The sensor output voltage will differ from
sensor to sensor. Please call factory if you have any
doubts.
O
RDERING
C
ODE
**For other than standard duct size (150 mm) please contact factory
T
ROUBLE
S
HOOTING
O/P mA Fault
Check the transmitter output connections.
Check the connection between the sensor and the
transmitter.
Check the output voltage of the sensor for sensor
open /short circuit.
O/P mA Not Matching to the Required Value
Check whether the sensor is having the same
serial number as the transmitter have.
If there is a wide difference, check for any damage
on sensor. If a reference sensor is available check
it with the transmitter working correctly or not.
If there is calibration doubt, apply known values of
Calibration
Code
and
check
the
Output
accordingly.
If still problem persist contact Masibus
.
P
RECAUTION
Don’t remove the sensor card from the signal
conditioning card. Don’t interchange the sensor
card form one unit to other unit directly. Its needs
calibration. Contact Masibus for any calibration
purpose. Don’t touch the RH sensor.
masibus
Automation& Instrumentation Pvt. Ltd
.
B/30, GIDC Electronics Estate, Sector- 25,
Gandhinagar-382044, Gujarat, India
Ph: 91-079-23287275 / 76 / 77 / 78 / 79
Fax: 91-079-23287281/ 82
Email: [email protected]
Web: www.masibus.com
Model
Transmitter Type
Mounting Type
Duct
Mounting
Flange
HT7S
XX
XX
X
00
Humidity
Transmitter
W0
Wall
Mount
N
No
10
Humidity
Transmitter with
Pt100 Passive
Output
D0
Duct
Mount
Y
Yes
11
Humidity
+Temperature
Transmitter
DX
Ex.Proof
Duct
Mount
11-Y
Humidity
+Temperature
Transmitter with
common Power
Rail
WX
Ex.Proof
Wall
Mount