TECPEL CL 326 Operating Instructions Manual

OPERATING INSTRUCTIONS

CL 326

DIGITAL THERMOMETER

INTRODUCTION

This instrument is a 3½ digit, compact-sized portable

digital thermometer designed to use external K/J/T/E type
thermocouples as temperature sensor. Temperature indica­tion follows Reference Temperature/Voltage Tables
(N.I.S.T. Monograph 175 Revised to ITS-90) for K/J/T/E
type thermocouples.

SAFETY INFORMATION

It is recommended that you read the safety and opera-

tion instructions before using the thermometer.

WARNING

To avoid electrical shock, do not use this instrument

when working voltages at the measurement surface over

24V AC or DC.

WARNING

To avoid damage or burns, do not make temperature

measurement in microwave ovens.

CAUTION

Repeated sharp flexing can break the thermocouple

leads. To prolong lead life, avoid sharp bends in the

leads, especially near the connector.

SPECIFICATIONS

ELECTRICAL

Temperature Scale: Celsius or Fahr enheit user-selectable.
Measurement Range:

Thermocouple Range
K-TYPE (0.1°C) -200°C to 1372°C,

-328°F to 1999°F
J-TYPE (0.1°C) -210°C to 1200°C,

-346°F to 1999°F
T-TYPE (0.1°C) -200°C to 400°C,

-328°F to 752°F
E-TYPE (0.1°C) -220°C to 1000°C,

-364°F to 1832°F

Calibration Range:

-210°C to 1372°C, (-364°F to 1999°F)

Auto range:

0.1°C /1°C , 0.1°F /1°F

Accuracy:

Accuracy is specified for operating temperatures over
the range of 18°C to 28°C (64°F to 82°F), for 1 year, not
including thermocouple error.
±(0.1% rdg + 1°C) on -60°C to 1372°C
±(0.1% rdg + 2°C) on -60°C to -220°C
±(0.1% rdg + 2°F) on -76°F to 1999°F
±(0.1% rdg + 4°F) on -76°F to -364°F

ENVIRONMENTAL

Ambient Operating Ranges:

0°C to 50°C (32°F to 122°F) <80% R.H.

Storage Temperature:

-20°C to 60°C (-4°F to 140°F) <70% R.H.

GENERAL

Display:

3½ digit liquid crystal display (LCD) with a maximum
reading of 1999.

Polarity:

Automatic,positive implied,negative polarity indication.

Overrange:

-OL is displayed.

Zero:

Automatic.

Reading Rate:

one time per second.

Low battery indication:

The “

” is displayed when the battery voltage drops

below the operating level.

Measurement rate:

1 times/second.

Accuracy:

Stated accuracy at 23°C±5°C, <75% R.H.

Input Connector:

Accepts standard miniature thermocouple connectors
(flat blades spaced 7.9mm, center to center).

Battery Life:

100 hours typical with carbon zinc battery.

Auto power off:

The meter key switch inactive for more than 70 minutes.

Temperature Coefficient:

0.1 times the applicable accuracy specification per °C
from 0°C to 18°C and 28°C to 50°C (32°F to 64°F and
82°F to 122°F).

Input Protection:

24V dc or 24V ac rms maximum input voltage on any
combination of input pins.

Maximum Differential Common Mode Voltage
(Maximum Voltage between T1 and T2 during mea­surement): 1volt.
Dimensions:

195mm(H) x 92mm(W) x 53mm(D).

Weight:

approx. 9 oz. (250g) including battery.

°C /°F Selecting the Temperature Scale

Readings is displayed in either degrees Celsius(°C) or
degrees Fahrenheit(°F).
When the thermometer is turned on, it is set to the tem­perature scale that was in use when the thermometer
was last turned off.
To change the temperature scale, press the °C or °F key.

“ ” Button

Press “

” button to toggle on and off of backlight.
The backlight will switch-off automatically after 30
seconds.

HOLD Mode

Pressing the HOLD key to enter the Data Hold mode,
the “HOLD” annunciator is displayed.
When HOLD mode is selected, the thermometer held
the present readings and stops all further measurements.
Pressing the HOLD key again to cancel HOLD mode
causing thermometer to resume taking measurements.

K/J/T/E Input Thermocouple Type

The TYPE key switch the input circulating selects the
K/J/T/E type thermocouple as input.

T1 T2/T1-T2 Input Selection

The input selection indicates which input is selected; T1
thermocouple, T2 thermocouple or the difference
between the two thermocouples (T1-T2).
When the thermometer is turned on, it is set to the tem­perature input that was in use when the thermometer
was last turned off.

Thermocouple Calibration

CAUTION

Must set the temperature input of this instrument to T1.

1. Set the temperature input of this instrument to T1.

2. Connect the proper thermocouple wire and miniature
male SMP connector to the instrument output.

3. Connect the other end of the thermocouple wire to the
instrument to be calibrated.

4. Using the range switch and the COARSE / FINE adjust
knobs set the instrument to the output required as read
on the LCD.

Other Type Thermocouple Calibration

(except K, J, T, E Type)

1. Connect the two proper thermocouple wires and minia­ture male SMP connector to the instrument output.

2. Connect the other end of one thermocouple wire to the
instrument to be calibrated and other end of one ther­mocouple wire to the monitoring reference thermome­ter.

3. Using the range switch and the COARSE / FINE adjust
knobs set the instrument to the output required as read
on the indicating thermometer.

OPERATOR MAINTENANCE

WARNING

To avoid possible electrical shock, disconnect the

thermocouple connectors from the thermometer

before removing the cover.

Battery Replacement

1. Power is supplied by a 9 volt “transistor” battery.
(NEDA 1604, IEC 6F22)

2. The “

” appears on the LCD display when replace-

ment is needed.

3. Remove the batteries from battery contacts.

4. When not use for long time remove battery.

5. Don’t keep in place with high Temp. or high humidity.

Cleaning

Periodically wipe the case with a damp cloth and deter-

gent, do not use abrasives or solvents.

Ver.1.2 01/30/13