Omega CL3512A User Manual 2

CL3512ACL3512A

CL3512A

CL3512ACL3512A

Digital Thermometer & CalibratorDigital Thermometer & Calibrator

Digital Thermometer & Calibrator

Digital Thermometer & CalibratorDigital Thermometer & Calibrator

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Table of contents

1.0 Introduction

1.1 Safety Information

1.2 Unpacking

2.0 Operation Procedure

2.1 Unit Drawing

2.2 Description of Buttons and Switches

2.3 Read Mode Procedure

2.4 Source Mode Procedure

3.0 Operator Maintenance

4.0 Specifications

5.0 Calibration Procedure

1.0 Introduction

The OMEGA® CL3512A calibrator/thermometer is two meters in one. The
CL3512A simulates type J/K/T/E thermocouple signals. Each signal is adjustable
by using the coarse and fine dials. The CL3512A can also be used as a dual
type J/K/T/E thermocouple input thermometer. Features include a large 3½
digit display with backlighting and display selections of HOLD, °C/°F, and

0.1/1°.
The source mode of the CL3512A simulates the thermocouple output to check
the operation of a thermocouple meter and make rough calibration adjustments.
A more accurate calibrator would be required for calibration of thermocouple
meters to specify tolerances.

1.1 Safety Information

It is recommended that you read the safety and operation 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.

To avoid damage or burns, do not make temperature measurement

Repeated sharp flexing can break the thermocouple leads. To prolong

lead life, avoid sharp bends in the leads, especially near the connector.

WARNING

in microwave ovens.

CAUTION

1

1.2 Unpacking

Remove the packing list and verify that all equipment has been received. If
there are any questions about the shipment, please call the OMEGA Customer
Service Department.

Upon receipt of shipment, inspect the container and equipment for any signs
of damage. Immediately report any damage to the shipping agent.

NOTE

The carrier will not honor any claims unless all shipping
material is saved for their examination. After examining and
removing contents, save the packing material and carton in the
event reshipment is necessary.

The following is supplied in the box:

• CL3512A

• Rubber boot

• 2 K beaded wire thermocouples

• K calibration cable

• 9 volt battery

• Operator's manual

2

2.0 Operation Proceedure

2.1 Drawing of Unit

Actual Dimensions: 195mm(H) x 92mm(W) x 53mm(D)

3

2.2 Descriptions of Buttons and Switches

/ Buttons

Temperature 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 the on and off backlight. The backlight will switch­off automatically after 30 seconds.

Button (HOLD Mode)

Press the HOLD key to enter the Data Hold mode, the "HOLD" annunciator is
displayed. When HOLD mode is selected, the thermometer will hold the
present reading and stop all further measurements.
Pressing the HOLD key again will cancel HOLD mode causing the thermometer
to resume taking measurements.

Button (K/J/T/E Input Thermocouple Type Selection)

The TYPE key allows for selection of J, K, E or T thermocouple types as either
the input or simulated output. To select thermocouple type press type key
once. Unit will briefly show 1888 and beep and then the type of thermocouple
selected will be indicated on the left hand side of the display. Continue pressing
the type key to step through the thermocouple types until desired type is
indicated.

4

/ / Input Selections

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.

Selector Switch

The circular selector switch is used to turn the unit off (!) or to select Reading

Mode (Input) or Simulation Mode (Output). There are nine selector switch
positions under output which provide rough adjustment of the simulated output.

Adjust

Course and fine adjustment Dials are used in Simulation Mode to allow a particular
simulated temperature to be selected once the output has been adjusted close to
the desired temperature using the selector switch.

5

2.3 Read Mode Proceedure

1. Plug Thermocouple Sensor into input T1 and/or T2.

2. Turn selector switch to Input.

3. Select proper thermocouple type (J, K, T or E) using type button.

4. Press T1 button to read thermocouple connected to input T1.
Press T2 button to read thermocouple connected to input T2.
Press T1-T2 if difference between T1 and T2 is to be read.

5. To Hold reading press HOLD button. To resume making measurements
press HOLD again.
Note: Unit will display -OL if input is out of range or thermocouple is

broken or not connected to proper input.

To save battery life, CL3512A will turn off automatically if no is key is
pressed for 70 minutes.

6

2.4 Source Mode Procedure (Calibration Simulation)

1. Turn CL3512A on by turning selector switch to any one of the output
selector positions.

2. Press T1 button.

3. Select thermocouple type (J, K, T or E) using type button.
Select °C or °F using °C or °F buttons.

4. Plug proper type of thermocouple wire into either one of the two output
connectors. (SMP male connector required)

5. Attach the other end of the thermocouple wire to the instrument being
tested/calibrated.

6. Move the output range switch to the temperature value close to the
desired simulated value.
Note: There are 9 temperature range switch positions arranged from left

to right representing low to high temperatures.
The display will read -OL if the output voltage for the meter is
higher than the maximum voltage for that particular thermocouple
type. For type T this will be in the highest 4 positions, type K in
the highest 3 positions, type J in the highest 2 positions, and type
E in the highest position only.

7. Adjust course and/or fine adjustment dial until desired temperature is
displayed on CL3512A.

8. Instrument under test should read same temperature as CL3512A. If not
adjust instrument under test or have recalibrated.

9. Repeat steps 6-8 at different temperatures as needed.

7

Source Mode Diagram

8

3.0 Operator

To avoid possible electrical shock, disconnect the thermocouple

connectors from the thermometer before removing the cover.

Battery Replacement

Power is supplied by a 9 volt "transistor" battery. The " " appears on the LCD
display when replacement is needed. To replace the battery, remove the two
screws from the back of the meter and lift off the battery cover. Remove the
battery from battery contacts.

Maintenance

WARNING

9

4.0 Specifications

ELECTRICAL

Temperature Scale: Celsius or Fahrenheit 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. (Read mode)
±(0.1%rdg + 1°C) range -60°C to 1372°C
±(0.1%rdg + 2°C) range -60°C to -220°C
±(0.1%rdg + 2°F) range -76°F to 1999°F
±(0.1%rdg + 4°F) range -76°F to -364°F

Simulation Accuracy: Measurement accuracy plus 1°C

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.

10

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.

Low battery indication: the"

drops below the operating level.

Measurement rate: 1 times/second.
Accuracy: Stated accuracy at 23°C±5°C,<75% relative humidity.
Dimensions: 195mm(H) x 92mm(W) x 53mm(D).
Weight: approx. 9 oz. (250g) including battery.
Input Connector: Accepts standard miniature thermocouple connectors (flat

blades spaced 7.9mm, center to center SMP type).

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.

"is displayed when the battery voltage

11

5.0 CL3152A Calibration Procedure

Note: The following calibration procedure should be performed only by

qualified technicians who have access to the items as following
items:
Equipment: 1) A very accurate millivolt source.

2) A TRC III ICE Point Reference or ice bath with type
K thermocouple.

Input Funtion "Calibration"

1. Before turning on the meter, turn the RANGE knob to position "INPUT"
and then move the jumper to the upper two pins of J5 which is at the left
upper of the PCB.

2. Input DCV 25.60mV to the T1. After the display is stabilized, then press

key and "0.1" is displayed.

3. Input DCV 74.00mV. After the display has stabilized, then press

key and "OL" is displayed.

4. Input

5. Do Not press any key. The meter will turn off automatically after 10

6. Turn the meter back on then input

0°C (K-type, use a K thermocouple on an ice bath, or

thermocouple calibrator).

After the display has stabilized then press

key.

seconds. Move

calibrated if the display reading reads 0°C.

the jumper

to the lower two pins of J5.

0°C (K-type). The meter will be

12

"Simulated Output" Test

1. Turn the knob "COARSE" right to the end, knob of RANGE turn right to
the last two position, press "TYPE" key to select "TYPE-E", if display
does not show "OL" then adjust VR4 slowly to make display ="OL"
(Note: Take care not to adjust VR4 too far).

13

CL3512A CALIBRATION PROCEDURES

Note: The following calibration procedure should perform only by qualified technicians

who have access to the items as following.

Equipment: The class of calibrator had better 10 times greater than the measured meter.

INPUT FUNTION CALIBRATE

1. Before turn on the meter, turn the RANGE knob to position "INPUT" and then

move short pin to upper two pin of J5 which is at the left upper of PCB.

2. Input DCV 25.6m V to the T1.After the display is stabilized,then press “ “

key and "0.1" is displayed.

3. Input DCV 74mV then press “ “ key. After the display is stabilized, then

press “ “ key and "OL" is displayed.

4. Input 0°C (K-type). After the display is stabilized and then press “ “ key.

5. Don't push any key and the meter will turn off automatically after 10 seconds.

Move short pin to lower two pin of J5.

6. Turn on the meter then input 0°C (K-type). The display reading reads 0°C if

the calibration procedure is right.

“CALIBRATION FUNTION” CALIBRATE

1.Turn the knob "COARSE" right to the end, knob of RANGE turn right to the last

two position, press "TYPE" key to select "TYPE-E", if display does not show "OL",
then adjust VR4 slowly to make display ="OL" (if “OL” displayed don’t adjust VR4

too far).

1

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months
from date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the normal one (1) year product
warranty to cover handling and shipping time. This ensures that OMEGA's customers receive maxim um cov erage on each product.If
the unit should malfunction, it must be returned to the factory for evaluation. OMEGA's Customer Service Department will issue an
Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to
be defective it will be repaired or replaced at no charge. OMEGA's WARRANTY does not apply to def ects resulting from any action
of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair,
or unauthorized modification. This W ARRANTY is V OID if the unit shows evidence of having been tampered with or sho ws evidence
of being damaged as a result of excessive corrosion; or current, heat moisture or vibr ation; improper specification; misapplication;
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limited to contact points, fuses, and triacs.

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FOR WARRANTY RETURNS, please ha ve the following

information available BEFORE contacting OMEGA:

1. P.O. number under which the product was PURCHASED.

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems relative to the
product.

OMEGA's policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest
in technology and engineering. OMEGA is a registered trademark of OMEGA ENGINEERING, INC. © Copyright 2002 OMEGA ENGINEERING,
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RETURN REQUESTS / INQUIRIES

FOR NON-WARRANTY REPAIRS, consult OMEGA for

current repair charges. Have the following information
available BEFORE contacting OMEGA:

1. P.O. number to cover the COST of the repair.

2. Model and serial number of product , and

3. Repair instructions and/or specific problems relative to the
product.

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