Aemc instruments CA861 User Manual

K-THERMOMETER (K-type thermocouple)
MODEL CA861

USER MANUAL

The AEMC® Model CA861 is a portable, easy-to-use, compact-sized digital thermometer
designed for simple one-hand operation. It uses an external K-type thermocouple with
standard miniature connector as sensor. The thermometer is supplied with a protective
rubber holster and one K-type thermocouple. The Model CA861 also features a back-light
LCD display, a data HOLD function, and a MAX recording function.

WARNING

• Thermometers are not designed to work on live electrical samples.

• Do not use this instrument when voltages at the sample point exceed

24VDC or 24Vrms.

• Do not make temperature measurement in microwave ovens. Leaking
microwaves may result in burns and serious injuries.

• Repeated sharp flexing can cause the thermocouple leads to break. To
prolong sensor life, avoid sharp bends in the thermocouple, especially
near the connector.

This symbol signifies CAUTION! and requests that the user refer to the user
manual before using the instrument.

PUSH BUTTONS

Center (Yellow) Function Switch: Slide the center button to turn ON the Thermometer
and select the 0.1° or 1° setting. Slide the button to OFF after use.

Back-Light

• Press the

• Press the

• Press the

temperature scale °C or °F is displayed in the lower right side corner of the display.

MAX Button:

• Press the MAX button to enter the MAX mode. The "MAX" annunciator appears in the
upper right hand corner of the display.

• The thermometer then displays and updates the maximum absolute temperature
values.

• Press the MAX button again to exit the MAX-display mode (“MAX” goes out).

• The HOLD button (see below) may be used in the MAX mode to “Freeze” (no longer

updates) the MAX measurement on the display.

• Press HOLD again to resume the MAX mode recording.

HOLD Button: The Hold button “freezes” the reading on the display. Press the “HOLD”
button to toggle (activate/release) HOLD. In the HOLD mode, the "HOLD" annunciator is
displayed in the upper part of the LCD display and the last reading is displayed until
released.

and °C/°F Button:

button to turn the Back-Light ON.

button again to turn the Back-Light OFF.

button for 2 seconds to change the temperature scale to °C or ° F. The

OPERATING INSTRUCTIONS

OPERATION

1. Connect the K thermocouple to the instrument input.

2. Put the thermocouple near or on the sample tested.

3. Slide the function switch to the appropriate range or, if in doubt, select the highest
setting (1°). If the measured temperature is below 200°, the higher resolution range 0.1°
can be selected, if needed.

4. The Model CA861 may be in degrees Celsius (°C) at po wer-up. Press the back-light
button

desired. The selected setting will remain for the next use.

5. Thermocouples need a certain time to respond. Take the reading when the
measurement has stabilized.

6. The HOLD button will freeze the measurement in the display, and will not update until
released.

7. When finished, remove the thermocouple from the sample, unplug the thermocouple
from the meter and slide the switch to OFF.

for more than 2 seconds to toggle over into degrees Fahrenheit (°F), if

SPECIFICATIONS

ELECTRICAL
Temperature Scale:

Celsius (°C) or Fahrenheit (°F) user-selectable
Measurement Range:

-40°F to 1999°F, -40°C to 1350°C

Resolution:

0.1°F/°C or 1°F/°C

Accuracy (meter):

-40°F to 1999°F: ±(0.1% rdg ± 2°F)

-40°C to 1350°C: ±(0.1% rdg ± 1°C)

(Accuracy is specified for operating temperatures over the range of 18°C to 28°C,
for 1 year, excluding the sensor)

Temperature Coefficient:

0.1 times the applicable accuracy specification

per °C from 0°C to 18°C and 28°C to 50°C.

Input Protection:

24VDC or 24Vrms maximum input voltage on any combination of inputs.

Input Connector:

Accepts standard miniature K thermocouple connectors.

Temperature Response:

Temperature indication follows Reference Temperature/Voltage Tables N.I.S.T.
Monograph 175 Revised to ITS-90 for K-type thermocouples.