Physitemp Instruments BAT-12 - Manual (Page 5)

4.2 Switch instrument OFF. Use a coin to undo screws on the back of the case and
slide case off. Remove battery from clip and replace with a similar 9V battery.
For BAT-12, alkaline batteries are recommended. Battery life will be approxi-
mately 160 hours.
For BAT-12R, a suitable 9V rechargeable battery should be used. DO NOT
INSTALL A NON-RECHARGEABLE BATTERY IN BAT-12R. If you acci-
dently try to recharge a non-rechargeable battery it may burst, leak and dam-
age the instrument.
5.0 ANALOG OUTPUT
5.0
A DC output, whose amplitude is approximately proportional to instrument
reading, is provided from the 3.5mm miniature jack on the front panel. A mating plug
is supplied with each BAT-12. This plug may be left in the socket until it is required
for use.
5.1 Use of the analog output with strip chart recorder
The output impedance of BAT-12 is 2 Kilohms, so connection to a potentio-
metric recorder will not affect either the calibration or accuracy.
The analog output is proportional to the input thermocouple voltage and is adequate
for most strip chart recordings where small temperature ranges are involved. The
output bears a non-linear relationship to temperature and, over wider ranges,
thermocouple tables can be used to compensate for linearity changes. Physitemp will
supply a copy of these tables on request.
5.2 Use of the analog output with Physitemp TCAT-1A Temperature Control
and Alarm Unit
BAT-12 with TCAT-1A can be used to control a heating or cooling device such as a
heat lamp or pad. This system is frequently used to control the temperature of animal
cages, etc.
For more information on the TCAT-1A, see our website, www.physitemp.com or call
us at 1-800-452-8510.
5
POSITIVE
OUTPUT (SIGNAL)
NEGATIVE
COMMON (RETURN)