KEPCO TEMPCO Temperature Compensation Probe - Manual

©2006, KEPCO, INC
Data subject to change without notice
228-1594 REV 1
I N S T R U C T I O N S H E E T
KEPCO
KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL (718) 461-7000 " FAX (718) 767-1102
http://www.kepcopower.com " email: [email protected]
An ISO 9001 Company.
TEMPCO
Temperature
Probe
TEMPERATURE
COMPENSATION PROBE
DESCRIPTION. Temperature compensation can prolong battery life by adjusting the float voltage automatically.
The Kepco TEMPCO Model Temperature Compensation Probes allow the output voltage of a Kepco battery charger
to be automatically decreased or increased for temperatures above or below 77°F (25°C), respectively, in the 0°C to
35°C range. Beyond this range, the compensation is clamped to 0°C and 35°C for temperatures below 0°C and
above 35°C, respectively. Compensation is 3mV/(°F)(cell) or 5.4mV/(°C)(cell) for cells of 2.23V nominal, and can be
calculated as follows:
• dV
T
= – (K
T
) (Ta – 77) (V
B
/2.23) where
• V
B
= Battery voltage,
• K
T
= 0.003V/(°F)(cell),
• Ta = ambient temperature in °F
• 2.23 = cell voltage at 77°F.
Thus, for example, to calculate the float voltage V
F
of a 14.5V battery charging at 80°F:
V
F
= V
B
+ dV
T
= 14.5 –(0.003)(80–77)(14.5/2.23)
= 14.5 – 0.059
= 14.441V.
The TEMPCO Models are identified by the length of the cable attached to the probe. TEMPCO-10 is 10 feet long,
TEMPCO-50 is 50 feet long, TEMPCO-100 is 100 feet long and TEMPCO-200 is 200 feet long.
INSTALLATION.
1 Connect the temperature probe cable to the TEMP PROBE connector at the front panel of the Kepco battery
charger. For Kepco KES or KRR battery chargers, verify that the TEMP PROBE NOT CONNECTED indicator on
the battery charger is not lit.
2 Attach the temperature probe to the negative (–) terminal of the battery being charged. If the threaded stud is
long enough, mount the probe on the threaded stud and attach it with another nut. Otherwise, remove the exist-
ing nut and use it to attach the temperature probe. In either case observe torque requirements when tightening
the nut. NOTE: The temperature probe is internally isolated from the battery charger connections, so it may be
connected to the (+) terminal of the battery if desired.