Hobo S-THC-M002 User manual

Temperature/RH Smart Sensor (S-THC-M00x) Manual
25929-A
The temperature/RH smart sensor is designed to work with smart sensor-compatible HOBO®
data loggers and stations. All sensor parameters are stored inside the smart sensor, which
automatically communicates configuration information to the logger without any
programming, calibration or extensive user setup.
Specifications
Temperature RH
Measurement Range -40°C to 75°C (-40°F to 167°F) 0-100%* RH at -40° to 75°C (-40°
to 167°F); exposure to conditions
below -20°C (-4°F) or above 95%
RH may temporarily increase the
maximum RH sensor error by an
additional 1%
Accuracy ±0.25°C from -40° to 0°C (±0.45°F
from -40° to 32°F)
±0.20°C from 0° to 70°C (±0.36°F
from 32° to 158°F)
±0.25°C from 70° to 75°C
(±0.45°F from 158° to 167°F)
±2.5% from 10% to 90% RH
typical to a maximum of ±3.5%
including hysteresis at 25°C
(77°F); below 10% and above
90% ±5% typical
Resolution 0.02°C (0.036°F) 0.01% RH
Bits Per Sample 16 16
Drift <0.01°C (0.018°F) per year <1% per year typical
Response Time (typical, to 90%
of change)
Without solar radiation shield:
3 minutes, 45 seconds in air
moving 1 m/s
With RS3-B solar radiation
shield: 6 minutes, 30 seconds in
air moving 1 m/s
Without solar radiation shield:
15 seconds in air moving 1 m/s
With RS3-B solar radiation
shield: 30 seconds in air moving
1 m/s
Operating Temperature Range -40°C to 75°C (-40°F to 167°F)
Environmental Rating Weatherproof: 0 to 100% RH intermittent condensing environments.
For best results, protect the temp/RH sensor from sunlight and direct
splashing by mounting it inside a protective enclosure, such as a solar
radiation shield.
Housing PVC cable jacket with ASA styrene polymer RH sensor cap; modified
hydrophobic polyethersulfone membrane
Sensor Dimensions 45.97 x 11.43 x 10.16 mm (1.81 x 0.45 x 0.40 inches)
W
eight S-THC-M002: 110 g (3.88 oz)
S-THC-M008: 180 g (6.35 oz)
Number of Data Channels** 2
Measurement Averaging Option No
Cable Lengths Available 2.5 m (8.2 ft); 8 m (26.2 ft)
Length of Smart Sensor
Network Cable*
0.5 m (1.6 ft); 6 m (19.6 ft)
The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).
The UKCA marking identifies this product as complying with all
relevant directives in the UK Declaration of Conformity.
* Maximum 100% RH readings are only logged with RX3000 stations. The maximum readings for this sensor with U30 and
H21 stations is approximately 99.99%.
** A single HOBO station can accommodate 15 data channels and up to 100 m (328 ft) of smart sensor cable (the digital
communications portion of the sensor cables).
Temperature/RH
Smart Sensor
Models: S-THC-M002
S-THC-M008
Accessories:
•Solar radiation shield
(RS3-B)

Temperature/RH Smart Sensor (S-THC-M00x) Manual
1-508-759-9500 (U.S. and International)
1-800-LOGGERS (564-4377) (U.S. only)
www.onsetcomp.com/support/contact
© 2021 Onset Computer Corporation. All rights reserved. Onset and HOBO are trademarks or registered
trademarks of Onset Computer Corporation. All other trademarks are the property of their respective
companies.
25929-A
Connecting the Sensor to a Station or Logger
To connect the sensor to a station or logger, stop the station or
logger from logging and insert the smart sensor’s modular jack
into an available smart sensor port. See the station manual for
details on operating stations or loggers with smart sensors.
Mounting
Use a solar radiation shield to mount the sensor. Use the cable
clamps included with the RS3-B radiation shield to secure the
smart sensor as shown.
Temp/RH Sensor mounted in
Solar Radiation Shield RS3-B (cross-section)
Mounting Considerations
•A solar radiation shield is strongly recommended when
measuring air temperature in direct sunlight. Solar
radiation can be a significant source of error in the
temperature and RH readings.
•When deploying an S-THC sensor, it is recommended that
you mount the sensor vertically. If it must be mounted
horizontally, then make sure the vent on the side of the
sensor is vertical or facing down.
•Thermally isolate the sensor from the mounting surface to
ensure accurate air temperature and humidity readings.
•Protect the sensor from direct exposure to the weather.
This will prolong the sensor accuracy.
•Secure the smart sensor adapter to the mast with the
cable ties as shown. Multiple smart sensor adapters can
be stacked as shown in the example below on the right.
•Alternatively, mount the smart sensor adapter to a flat
surface using two screws (no larger than a #6) and two
washers as shown.
•If you are running sensor cables along the ground, use
conduit to protect against animals, lawn mowers,
exposure to chemicals, etc.
•Refer to the station manual and Tripod Setup Guide at
www.onsetcomp.com/support/manuals for more
information regarding setting up stations.
Maintenance
The temperature/RH smart sensor is sensitive to dust, salts and
other airborne contamination. Periodically inspect the sensor
probe and rinse it with distilled water to clean it. Do not use hot
water, organic solvents, or detergents. Dry before use.
One Smart Sensor
Adapter Mounted
Smart sensor
adapter secured
with cable ties
Two Smart Sensor Adapters
Stacked and Mounted