Martel Electronics T120 User Manual

5

Tuff Tools

Model T120

Hand-held

Thermocouple

Calibrator

OPERATING INSTRUCTIONS

MAINTENANCE

Generally, with normal usage, this calibrator
should hold its rated specifications for at least
12 months. Beyond this, it should remain within

1.5X of its specification over its useful life,
provided it is not abused or tampered with.If
after the stated warranty period, the device
falls out of calibration, it can be returned to
Martel for re-calibration. Please call 1-800-821­0023 for pricing and return information.

WARRANTY

Martel warrants all products against material
defects and workmanship for a period of
twelve (12) months after the date of shipment.
Problems or defects that arise from misuse or
abuse of the instrument are not covered.If any
product is to be returned, a “Return Material
Authorization” number must be obtained by
calling our Customer Service Department at
1-800-821-0023.

www.martelcorp.com

e-mail: [e-mail]

Fax: [phone] Tel: [phone]

800-821-0023

Martel Electronics

PO Box 770

Londonderry, NH 03053

02C1971 Rev B 02/04

2 431

GENERAL DESCRIPTION

The T120 is designed to be a simple to use,
high accuracy thermocouple calibrator capable
of either simulating or reading J, K, T, or E
thermocouple types. A standard thermocouple
mini-connector makes connections easy while
providing direct contact with the internal cold
junction compensation circuitry.

When used as a thermocouple simulator, the
T120 provides 2 sets of output control keys
which allow the user to either “step” in 100°
increments or scroll in smaller increments.

INSTALLATION

UNPACKING

Remove the Packing List and verify that all
equipment has been received. If there are any
questions about the shipment, please call
Martel at 1-800-821-0023.

When you receive the shipment, inspect the
container and equipment for any signs of
damage. Note any evidence of rough handling
in transit. Immediately report any damage to
the shipping agent.

NO

TE

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

SET-UP

Before beginning, become familiar with the
keypad layout and the configuration of the
input/output jacks.Remember, these jacks are
used in multiple configurations so pay careful
attention to how the test leads are connected
for the specific application.

OPERATING PROCEDURE

1.Turn on power and select the desired
thermocouple type by depressing the T/C
SELECT key. Once the desired T/C is
selected, it will remain in memory until a
new T/C type is selected.

2. Select either Input or Output mode
depending on whether you want to read a
thermocouple or simulate a thermocouple
signal.

3. Connect the appropriate thermocouple to
the mini-connector on the top of the T120.

4. If you are using the T120 in the output mode
use the STEP or SCROLL keys to set the
output.The STEP key will step in 100°
increments and the SCROLL key allows
single degree increments which will increase
in speed if the switch is depressed for
several seconds.

OPERATING MODES

1.When operating in the thermocouple output
mode, the T120 has the ability to simulate
up to 4 T/C types (J, K, T, E) into devices
which measure thermocouples:

Note: If the T120 is improperly connected to a
low impedance load (either a short or near
short) the display will flash “ERROR”.

FIGURE 1

SIMULATING A THERMOCOUPLE OUTPUT

2.When operating in the thermocouple Read
Mode the T120 can be used to read the
temperature of a thermocouple probe.

In this mode, the T120 will detect an open
circuit should the thermocouple junction
malfunction. In this case, the display will
flash “OPEN”. It will also flash “OPEN” if no
probe is connected in the Input Mode.

FIGURE 2

READING A THERMOCOUPLE PROBE

SPECIFICATIONS

Ranges J -100 to 1000°C

K -100 to 1200°C
T -100 to 400°C
E -100 to 950°C

Resolution 1°C or 1°F
Accuracy ±1°C above 0°C;

±1.5°C below 0°C

1

Operating Temp. 0 to 50°C
Storage Temp. -20 to 60°C
Temperature Coef. .01% F.S./°C
Power

2

9V alkaline battery (Yields

approx. 25 hrs.of operation)

Case Size 1.43” x 3.15” x 5.7”
Weight 12 oz.

Notes:

1

Accuracy is at 23°C ±2°C and includes

CJC error.

2

A low battery indication is given at 5.5 volts.

}

All ranges
can be read
in °C or °F

Thermocouple
mini-connector

Use thermocouple wire for
the type selected (e.g. if a
"J" T/C is being simulated,
you must use "J" wire.)

Thermocouple

device under test

greater input

impedance

1Kohm or

Thermocouple
mini-connector

Thermocouple

Probe (J, K, T or E)