ThermoWorks 232-101 User Manual

Therma Waterproof

Therma Differential

Operating Instructions

INSTRUMENT OPERATION - Connect probes via the
socket(s) located at the top of the instrument. (The
Therma Waterproof and Therma Differential use a
miniature type K thermocouple connector/s). Switch
the instrument on and apply the tip of the probe to the
substance or medium to be measured. The instrument
reading may take a few seconds to stabilize, depending
on the nature of the measurement and sensitivity of
the probe.

HOLD - Press the HOLD button to stop measurements
and freeze the display temporarily, press again to
continue measuring.

AUTO-OFF - The unit will switch off automatically after
10 minutes. To disable auto-off press the HOLD button
while switching on the instrument (this is reset when
the instrument is switched off).

OPEN CIRCUIT/FAULTY PROBE - If the probe has
developed an 'Open Circuit' fault the instrument will
display 'Err'.

SENSORS - Therma Waterproof and Therma
Differential should only be used with type K (Nickel
Chromium/Nickel Aluminium) thermocouple
probes (to BS EN 60584-2) fitted with miniature
type K thermocouple plugs (to BS EN 50212).
This instrument is designed to be compatible with
ThermoWorks manufactured probes.

BATTERY REPLACEMENT - The instrument will display
a low battery symbol to warn that the batteries will need
changing soon. The instrument continues to measure
accurately but after further usage the instrument will
display 'flat bat' and shutdown. Replace the three AAA
batteries located under the rear case half that is held in
place by six screws. Check the seal for damage and
carefully replace the rear case half, re-fit and tighten
the screws.

MAX/MIN - Press the MAX/MIN button to display the
values. The instrument retains the max/min values
when switched off. To reset, press the MAX/MIN button
for three seconds, 'rst' will be displayed.

BACKLIGHT - Press the HOLD button for two seconds.
Please Note: the backlight will not operate if the low
battery symbol is being displayed. (Backlight timeout
= 20 seconds).

CALIBRATION TRIM - THERMA WATERPROOF ONLY
Press the MAX/MIN and ON/OFF buttons at start-up for
five seconds to enter ('Offset' is displayed). MAX/MIN
then cycles (continuous loop) the trim value in 0.1
steps up to ±2.0ºC (3.6ºF). Press ON/OFF to save
the value and exit Trim mode. (Instrument should not
require trim adjustment. Should only be performed by
qualified person with appropriate calibration standards.)