Masibus HT7S Series User manual

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Issue No.:05
HT7S Series
INDEX
A PPLICATION .................................................................................................................................................... 1
S PECIFICATION ................................................................................................................................................ 2
D IMENSION ........................................................................................................................................................ 3
S AFETY AND WARNING ................................................................................................................................. 4
C ONFIGURATION AND CONNECTION ........................................................................................................ 4
I NSTALLATION .................................................................................................................................................. 4
O RDERING CODE ............................................................................................................................................. 5
T ROUBLE SHOOTING ..................................................................................................................................... 5
P RECAUTION ..................................................................................................................................................... 5

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Issue No.:05
Page | 1
HT7S Series
Loop Powered Humidity cum Temperature
Transmitter
• HT7S00:Humidity Transmitter
• HT7S10 : Humidity Transmitter with Pt100 Passive Output
• HT7S11 : Humidity cum Temperature Transmitter
• HT7S11-Y : Humidity cum Temperature Transmitter with
Common Power
HT7S series loop Powered transmitter series are designed for highly
accurate Humidity and temperature measurement for industrial,
pharmaceutical and building automation applications. They are
available as wall mount, duct mount and flame proof versions.
HT7S series transmitters provides linear output signals proportional to
relative humidity and temperature. HT7S series device are designed to
provide better than 2% RH accuracy and Class A RTD with excellent
long term stability.
Loop Powered 4-20mA DC output signals enables long distance
remote display, recording, controlling or easy interface to PLC/DCS
systems. Two-wire connections allow easy installation directly into air
ducts or within a controlled area. The right choice of the filter cap
enables usage in harsh environmental conditions.
The model HT7S series uses capacitance based sensor for humidity
measurement, that is unaffected by high humidity, dust, fog etc. A
rugged weather proof enclosure is available to monitor space humidity
and temperature.
F EATURES
•Measuring range 0-100 % RH
•Linearised analog 4-20mA signal output (2wire loop powered)
•Replaceable humidity sensor assembly
•Wide range of models to suit many applications
•Class-A RTD Pt 100 sensor used for temperature measurement
•High Accuracy
•Excellent long-term stability
A PPLICATION
•Pharmaceutical Labs/Industry
•HVAC application
•Building automation
•Energy management
•Research Laboratories
•
Weather
telemetry
HT7S Series Transmitter
•Duct and wall type models available
•High stability electronics, precision
and flexibility
•Easy and safe For installation
•Stable measurements and reduced
Maintenance

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HT7S Series
S PECIFICATION
R
ELATIVE
H
UMIDITY
Measurement range :0-100% RH
Output :4-20mA (two wire)
Maximum Loop Resistance :RLoad=((Supply Voltage-12)/0.021)Ohm
Accuracy at 25°C :± 2%RH (0 to 90%),± 3%RH (90 to 100%)
Hysteresis :± 1.3%RH of Operating humidity span
Repeatability :± 0.6%RH
Stability :± 1%RH typical at 50%RH in 5 years
Sensor :Capacitive sensor
Sensor response time :15 sec in slowly moving air at 25°C
T
EMPERATURE
S
ENSOR
HT7S00 :NA
HT7S10 :Passive Pt-100 (Class A) 0 to 50°C
HT7S11, HT7S11-Y :Pt-100 (Class A) 0 to 50°C
O
UTPUT
HT7S00 :NA
HT7S10 :Pt 100, 3W
HT7S11, HT7S11-Y :4-20mA (two wire)
Maximum Loop Resistance :RLoad=((Supply Voltage-12)/0.021)Ohm (Applicable for HT7S11 and
HT7S11-Y only)
A
CCURACY AT
25°C
HT7S00 :NA
HT7S10 :± 0.2% of FS
HT7S11 :± 0.2% of FS
P
OWER
S
UPPLY
:12 to 36 VDC for Resistive Load
P
HYSICAL
D
IMENSIONS
Wall Mount :80 (H)mm x 82 (W)mm x 55(D) mm
Duct Mount :80 (H)mm x 82 (W)mm x 55(D) mm with ~180mm Duct
Flame Proof Duct Mount :100(H)mm x 90(W)mm x 106(D)mm with ~180mm Duct
Flame Proof Wall Mount :120(H)mm x 120(W)mm X 102(D)mm
M
OUNTING
:Wall / Duct
W
EIGHT
Wall Mount :300 gm Approx.
Duct Mount :500gm Approx.
Flame Proof Duct Mount :1.1 Kg Approx.
Flame Proof Wall Mount :1.2 Kg Approx.
Cable gland
Wall Mount and Duct Mount :PG 7
Flame Proof Duct Mount :3/4" ET
Flame Proof Wall Mount :1/2" NPT
E
NCLOSURE
Wall Mount :ABS plastic
Duct Mount :ABS plastic with SS Duct and Nylon Flange
Flame Proof Duct Mount :Aluminum Alloy (LM-6(A6-M)) with SS Duct and Nylon Flange
Flame Proof Wall Mount :Aluminum Alloy (LM-6(A6-M)) with SS Sensor Pipe
Sensor protection :Sintered bronze filter
E
NVIRONMENTAL
T
EMPERATURE RANGE
Operating Temperature
Wall Mount and Duct Mount :0 to 50°C
Flame Proof Wall Mount and Duct Mount :0 to 85°C
Humidity :0 to 100%(non-condensing)
T
ERMINALS
D
ETAIL
Terminal Type :Screw Type
Connection, single/stranded wires :≤2.5 mm2, AWG 14
Protection, housing with cover/terminals :IP 65 For Wall Mount and Duct Mount
:IP 66 For Flame Proof Wall Mount and Duct Mount

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HT7S Series
D IMENSION

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HT7S Series

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HT7S Series
S AFETY AND WARNING
To avoid Electrostatic Discharge (ESD) to the
transmitter, that may cause permanent damage,
Operator must operate device using ESD safe tools
and clothing.
Before installation or beginning of any troubleshooting
Procedures, the power to all equipment must be turned
off and isolated. Units suspected of being faulty must
be Disconnected and removed first and brought to a
properly equipped workshop for testing and repair.
Component replacement and internal adjustments
must be done either by Masibus or done under the
guidance of Masibus.
Wiring must be carried out by skilled personnel and
correct tools.
All wiring must confirm with standards of good practice
and local codes and regulations. Wiring must be
suitable for voltage, current, and temperature rating of
the system. Beware not to over-tighten the terminal
screws.
C ONFIGURATION AND CONNECTION
HT7S series transmitters contain four variants,
configurable as shown in below wiring diagrams.
1. Connection for HT7S00
2. Connection for HT7S10
3. Connection for HT7S11
4. Connection for HT7S11-Y
I NSTALLATION
HT7S Series transmitter is available in wall
mounting, duct mounting and flame proof duct
mounting. Light weight wall anchors and mounting
screws are included for wall mounting and a duct
mounting kit is also available for duct mount
models.
1. Wall Mount
With mounting Plates (Provided) attach the wall
assembly plate to the wall with two screws.
2. Duct Mount and Flame Proof Duct Mounting
To install these device, loosen up the LNKey screw
available on Flange so that Flange moves easily on
Duct Pipe. Insert the Duct probe in Duct hole at
desired depth and then tighten up the LNKey screw
on Flange. After this step fix the Flange on Ducting.
Mechanical Installation
Relative humidity is extremely dependent on
temperature. Proper measurement of relative
humidity requires that the probe and its sensors be
at exactly the temperature of the environment to be
measured.
Because of this, the location where you choose to
install the probe can have a significant effect on the
performance of the instrument.

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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: [phone]
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