ThermoWorks 231-279 User Manual

SPECIFICATIONS

Range: -56.2 to 572°F (-49.9 to 299.9°C)
Resolution: 0.1° or 1° - user selectable
Accuracy: ±0.72°F (-58 to 392°F), ±1.8°F (392 to 572°F)

±0.4°C (-49.9 to 199.9°C), ±1°C (200 to 299.9°C)

Sensor Type: K thermocouple
Battery: 2 x 3 volt CR2032 lithium coin cell
Battery Life: 1500 hours
Display: 0.55” (14mm) LCD
Dimensions: 0.75" x 1.85” x 6.1” (19mm x 47mm x 153mm)
Weight: 0.21lb. (97g)

CALIBRATION

Test Temperature 32°F (0°C) 212°F (100°C)
Instrument Indication
Serial Number
Calibrated by Date

This Thermapen has been checked or calibrated against reference instrument(s)
calibrated by an UKAS accredited calibration laboratory. Traceable to NIST.

Made in the UK

Pro Surface Thermapen

Air Thermapen

™

™

1762 W. 20 S. #100, Lindon, UT 84042

Ph: 801-756-7705 Fax: [phone]

www.thermoworks.com

Operating Instructions

Ref: 547-115 06.05.13P-11-033-02-b

INSTRUMENT OPERATION - The instrument
is switched on by unfolding the probe until the
display shows the temperature. The unit is turned
off by folding the probe back into the side of
the unit. The probe should not be rotated more
than 180 degrees as damage will occur. It is
recommended to store the probe, in the closed
position, when not in use.

Apply the tip of the probe to the substance, surface or area to be measured.
The probe should be allowed adequate time to stabilize to the temperature of
the item to be measured.

INSTRUMENT CONFIGURATION
This instrument has four user
selectable slide switches (switch
bank), adjustable with a paperclip,
and a single push button ‘Trim
Adjust’ which is located under the
battery cover.

ON

1 2 3 4

+

CR2032

3V

Switch bank
Trim adjust
CR2032 battery

Switch

(factory default shown)

ON

1 2 3 4

Switch 1 - Display Units - Changes
display units between °F (factory
default) and °C. To change to °C push the switch toward the batteries.
Switch 2 - Resolution - To change the resolution from 0.1°F (factory default)
to 1°F push the switch away from the batteries.
Switch 3 - Auto-off - To disable the auto-off (factory default – 10
minutes) push the switch away from the batteries.
Switch 4 - Reading Trim - For normal use, we do not recommend using the
‘Trim Adjust’. For further details visit www.thermoworks.com.

INSTRUMENT CLEANING - Clean the instrument regularly with an anti­microbial probe wipe or spray cleaner on a paper towel to
avoid potential food-borne bacteria growth.

BATTERY REPLACEMENT A battery symbol indicates
that the batteries will need replacing. The instrument
continues to measure accurately but we recommend that

ON

1 2 3 4

+

CR2032

3V

the batteries be changed as soon as possible. To replace

the batteries, remove the battery cover using a coin (U.S. nickel works best).
Remove the batteries by pulling the battery retaining clip back while holding
the unit upside down. Replace both batteries, positive side up, replace cover.

ERROR MESSAGES - ‘Lo’ will be displayed if you are measuring below the
instrument’s range. ‘Hi’ will be displayed if you are measuring above the
instrument’s range. ‘Err’ will be displayed if the probe develops a fault. If the
error message remains, contact our service depar tment for further assistance.

EMC/RFI - Instrument performance may be affected if operated within a
high frequency radio field, such as near a mobile phone, or if subjected to an
electrostatic shock.

GUARANTEE - This instrument carries a one-year warranty against defects in
either components or workmanship. During this period, products that prove
to be defective will, at the discretion of ThermoWorks, be either repaired or
replaced without charge. This warranty does not apply to probes, where a
six-month period is offered. The product warranty does not cover damage
caused by fair wear and tear, abnormal storage conditions, incorrect use,
accidental misuse, abuse, neglect, misapplication or modification. Full details
of liability are available within ThermoWorks’ Terms & Conditions of Sale at
www.thermoworks.com. In line with our policy of continuous development, we
reserve the right to amend our product specification without prior notice.

Recommendations for improving surface temperature measurements:

1. Surface readings may be affected by airflow, sensor contact with the
surface being measured, the surface type, surface inconsistencies, and
measuring area cleanliness.

2. Make sure that the flat bottom area of the probe tip maintains constant and
flat contact with the surface being measured.

3. Apply firm pressure.Allow sufficient time for the reading to stabilize.

4. Clean surface before taking measurements.

5. Readings may be enhanced with a small amount of cooking oil to establish
better thermal contact with the sensing area.

6. Surface temperatures may vary along hot surfaces. It is recommended to

test in multiple locations.