Handling Batteries / Rechargeable Batteries Correctly; Special Notes On Use; Introduction - Ahlborn THERM 2420 Operating Instructions Manual

3.3 Handling batteries / rechargeable batteries correctly

When inserting batteries / rechargeable batteries ensure that
these are correctly polarized. If the device will probably not be
needed for a relatively long period of time or if the batteries are
empty remove the batteries; this will prevent battery acid spilling
on and damaging the device. Rechargeable batteries should be
recharged as and when necessary. You should never attempt to
recharge an ordinary (non-rechargeable) battery; it may explode !
Batteries / rechargeable batteries must never be short-circuited
or thrown on the fire. Batteries / rechargeable batteries are spe-
cial waste and must not be discarded together with normal do-
mestic waste.

3.4 Special notes on use

 If the device is brought into the work-room from a cold environment there is
a risk that condensation might form on the electronics. In measuring opera-
tions involving thermocouples pronounced changes in temperature may
cause substantial measuring errors. You are advised therefore to wait until
the device has adjusted to the ambient temperature before starting to use it.
 Do not run sensor lines in the vicinity of high-voltage power cables.
 Before you touch any sensor lines, ensure that all static electricity has been
discharged.

4. INTRODUCTION

The THERM 2420 measuring instrument has just one measuring input with a
miniature thermal socket suitable for connecting most thermocouple sensors.
For operation purposes the device incorporates a large LCD display and a key-
pad.
Functions
Measuring ranges
7 thermocouple types, units can be selected °C or °F or mV.
Measured value
Measured data acquisition at 2.5 mops, automatic cold junction compensation,
autozero, and sensor breakage detection
Relative measuring
The measured value can at any time be set to zero in order to display the dif-
ference with respect to a reference value.
Maximum and minimum values
For each measuring operation the maximum value and minimum value are ac-
quired and saved to memory. These values can be displayed and, as and
when necessary, deleted.
Measured value memory
A measured value in the display can be saved by simply pressing a key.
Handling batteries / rechargeable batteries correctly
THERM 2420 5