
INSTRUCTION SHEET
KEPCO
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:
•dVT = – (KT) (Ta – 77) (VB/2.23) where
•V
= Battery voltage,
B
•K
= 0.003V/(°F)(cell),
T
• Ta = ambient temperature in °F
• 2.23 = cell voltage at 77°F.
Thus, for example, to calculate the float voltage VF of a 14.5V battery charging at 80°F:
V
= VB + dVT
F
= 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 existing 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.
KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL (718) 461-7000 " FAX (718) 767-1102
©2006, KEPCO, INC
Data subject to change without notice
http://www.kepcopower.com " email: hq@kepcopower.com6
228-1594 REV 1

MODEL
LENGTH "L"
TEMPCO-10
TEMPCO-50
TEMPCO-100
TEMPCO-200
10 FEET
50 FEET
100 FEET
200 FEET
FIGURE 1. TEMPERATURE COMPENSATION PROBE
TABLE 1. TEMPCO TEMPERATURE COMPENSATION PROBE SPECIFICATIONS
SPECIFICATION RATING CONDITION
Supply Voltage
Temperature Range
Accuracy
Non-linearity ±0.2°C typ., ±0.5°C max.(by design) 0°C
Sensor gain Range: +9.8 to 10.2mV/°C, +10.0mV/°C typ. 0°C
Load Regulation ±0.5mV/mA typ., ±5mV/mA max.(by design) 0
Line Regulation ±0.02mV/V typ., ±0.2mV/V max.(by design) 4V
Quiescent Current 91.5
Quiescent Current Temperature Coefficient +0.39
Minimum Temperature for Rated Accuracy 0°C Kepco KRR, KES Models
Long Term Stability ±0.08°C typ. 1000 hours, with junction at T
Thermal Resistance Approximately 65°C/W Junction - ambient
Resistance
Positive and Output wires 0.05 Ohms/ft max.
Return wire 0.01 Ohms/ft max
±0.6°C typ., ±1.5°C max.(tested) TA = 25°C
±0.9°C typ., ±2°C max.(by design) TA = 100°C, TA = 0°C
µA typ., 141µA max.(by design) V
µA/°C typ., +0.7µA/°C (by design), 4V ≤ V
+5V Kepco KRR, KES Models
Range: +4V to +30V Other Applications
0°C to 35°C Kepco KRR, KES Models
0°C to 100°C Other Applications
≤ T
≤ 100°C
A
≤ T
≤ 100°C
≤ I
≤ 1mA, 0°C ≤ TA ≤ 100°C
L
≤ V
S
= +30V, 0°C ≤ TA ≤ 100°C
S
A
≤ 30V, 0°C ≤ TA ≤ 100°C
≤ 30V
S
TA = 25°C
Max
KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL (718) 461-7000 " FAX (718) 767-1102 " email: kepco-
111006 228-1594 REV 1 2