User Guide
K-type, Clip-on
Wet Bulb
Thermocouple
Model: ATWB1
Max: 150ºF
OPERATOR’S MANUAL
Description
The ATWB1 is an inexpensive and effective way
to take a wet bulb measurement. The ATWB1 is
equipped with a durable hydrophillic sock specifical-
ly designed for wet bulb measurements. Increasing
the reliability in the wet bulb measurements. The
alligator clip allows the user to affix the ATWB1 to a
fixed surface, such as a vent, allowing the user to
take hands free measurements. The ATWB1 also
comes with a wrap tab making it easy to wind and
store the thermocouple.
The ATWB1, K-Type, thermocouple can be used
continously to take temperature readings up to
150ºF. The ATWB1 can be used with any ther-
mometer which accepts a K-type thermocouple.
Operation
To use the ATWB1 plug it into any thermometer
accepting a K-type thermocouple and adjust the
device to the appropriate settings. Then submerge
socked probe tip under water until it is fully saturat-
ed and place ATWB1 probe in air flow. The wet bulb
reading will be the lowest reading before the tem-
perature rises back up.
Calibration
Due to variances in the thermocouple wire and
other parts of the system, a field calibration should
be conducted before use. Field calibration typically
gives +/- 1ºF overall accuracy. The instructions for
this calibration should be in the operating manual
for the thermometer.
Specifications
Thermocouple: K-type Nickel Chromium/Nickel
Aluminum.
Accuracy: -50ºF to 150ºF +/- 4ºF,
Range: -50ºF to 150ºF maximum continous oper-
ation.
Probe insulation: While wire insulation may be
designated for higher temperatures, due to the
flamability of the wet sock we recommend that a
maximum measured temperature of 150ºF.
Plug: K-Type Thermocouple male mini plug.
Broken Wires:
Due to frequent bending, the K-type thermocou-
ple wire may break or come loose, typically near the
plug. To repair, cut and strip the thermocouple wire
near the plug. The red wire is the (-) wire and it
belongs on the wider of the two plugs. Loosen the
screws on plugs and wind the conductors around
the appropriate screws and tighten. Finally, position
the plugs into the tab and screw the tab back togeth-
er.
Warranty
The ATWB1, K-Type, clip-on, wet bulb thermo-
couple is warranted against manufacturer’s defects
for one year. This warranty does not apply to
defects resulting from abuse, neglect, accident,
unauthorized repair, alteration, or unreasonable use
of the instrument. Any implied warranty arising out
of the sale of Fieldpiece's products including but not
limited to implied warranties of merchantibility, and
fitness for purpose, are limited to the above.
Fieldpiece shall not be liable for incidental or con-
sequential damages.
Service
Any defective ATWB1 should be returned to
Fieldpiece for warranty service along with proof of
purchase.
Fieldpiece Instruments, Inc.
580 West Central Avenue, Suite A
Brea, California 92821
(714) 257-9060 Fax: (714) 257-9069
www.fieldpiece.com
WARNINGS
When testing hot temperatures, the thermocouple
and metal alligator clip may become hot. Do not han-
dle the thermocouple or the metal clip when hot.
!
!
K-type, Clip-on
Wet Bulb
Thermocouple
Model: ATWB1
Max: 150ºF
OPERATOR’S MANUAL
Description
The ATWB1 is an inexpensive and effective way
to take a wet bulb measurement. The ATWB1 is
equipped with a durable hydrophillic sock specifical-
ly designed for wet bulb measurements. Increasing
the reliability in the wet bulb measurements. The
alligator clip allows the user to affix the ATWB1 to a
fixed surface, such as a vent, allowing the user to
take hands free measurements. The ATWB1 also
comes with a wrap tab making it easy to wind and
store the thermocouple.
The ATWB1, K-Type, thermocouple can be used
continously to take temperature readings up to
150ºF. The ATWB1 can be used with any ther-
mometer which accepts a K-type thermocouple.
Operation
To use the ATWB1 plug it into any thermometer
accepting a K-type thermocouple and adjust the
device to the appropriate settings. Then submerge
socked probe tip under water until it is fully saturat-
ed and place ATWB1 probe in air flow. The wet bulb
reading will be the lowest reading before the tem-
perature rises back up.
Calibration
Due to variances in the thermocouple wire and
other parts of the system, a field calibration should
be conducted before use. Field calibration typically
gives +/- 1ºF overall accuracy. The instructions for
this calibration should be in the operating manual
for the thermometer.
Specifications
Thermocouple: K-type Nickel Chromium/Nickel
Aluminum.
Accuracy: -50ºF to 150ºF +/- 4ºF,
Range: -50ºF to 150ºF maximum continous oper-
ation.
Probe insulation: While wire insulation may be
designated for higher temperatures, due to the
flamability of the wet sock we recommend that a
maximum measured temperature of 150ºF.
Plug: K-Type Thermocouple male mini plug.
Broken Wires:
Due to frequent bending, the K-type thermocou-
ple wire may break or come loose, typically near the
plug. To repair, cut and strip the thermocouple wire
near the plug. The red wire is the (-) wire and it
belongs on the wider of the two plugs. Loosen the
screws on plugs and wind the conductors around
the appropriate screws and tighten. Finally, position
the plugs into the tab and screw the tab back togeth-
er.
Warranty
The ATWB1, K-Type, clip-on, wet bulb thermo-
couple is warranted against manufacturer’s defects
for one year. This warranty does not apply to
defects resulting from abuse, neglect, accident,
unauthorized repair, alteration, or unreasonable use
of the instrument. Any implied warranty arising out
of the sale of Fieldpiece's products including but not
limited to implied warranties of merchantibility, and
fitness for purpose, are limited to the above.
Fieldpiece shall not be liable for incidental or con-
sequential damages.
Service
Any defective ATWB1 should be returned to
Fieldpiece for warranty service along with proof of
purchase.
Fieldpiece Instruments, Inc.
580 West Central Avenue, Suite A
Brea, California 92821
(714) 257-9060 Fax: (714) 257-9069
www.fieldpiece.com
WARNINGS
When testing hot temperatures, the thermocouple
and metal alligator clip may become hot. Do not han-
dle the thermocouple or the metal clip when hot.
!
!