KEPCO TEMPCO User Manual

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 [phone] " FAX [phone]

©2006, KEPCO, INC
Data subject to change without notice

http://www.kepcopower.com " email: [e-mail]6

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 [phone] " FAX [phone] " email: kepco-

111006 228-1594 REV 1 2