Martel Electronics T130 User Manual

5 6

Tuff Tools

Model T130

Hand-held

RTD Calibrator

OPERATING INSTRUCTIONS

Figures 2 and 3 illustrate the proper connection
procedure.

Figure 2

Figure 3

In both of these examples a jumper(s) must be
made at the device under test for the circuit to
work properly.The proper connections for these
jumpers are generally shown by the label or
silkscreen on the device under test.If proper
RTD connections are not obvious refer to
instruction manual for the device under test.

2. RTD Read Mode
The T130 can also be used to read an RTD

probe or similar RTD sensor. The T130 only
works in the 4 wire mode; however, 2 and 3
wire RTD's can be read as long as multiple
connections are made at the RTD loads.Refer
to the label on the rear of the T130 for connec­tion information.

SPECIFICATIONS

Ranges PT385 -200 to 850°C

PT392 -200 to 850°C
Ni120 -80 to 320°C
Jis.392 -200 to 850°C

Resolution 1°C or 1°F
Accuracy ±1°C
Excitation Current Range

(Source Mode) 0.125 to 2.0mA continuous
Operating Temp. 0 to 50°C
Storage Temp. -20 to 60°C
Temperature Coef. ±.01% F.S./°C
Power

1

9V alkaline battery

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

Notes:

1

A low battery indication is given at 5.5 volts.

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 1-800-821-0023
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.

P.O.Box 897

Windham, NH 03087

1-800-821-0023

Two-wire Tran smitter
with three-wire RTD

Label or silkscreen
showing RTD
connection points.
The RTD sensor
must be
disconnected
during calibration.

4-20mA

RTD

mA

–

+

output

(+)

Flows from transmitter into calibrator

(–)

Excitation Current

Top View

of Model T130

1

2

(+)

5

3

4

(–)

Two-wire Tran smitter
with four-wire RTD

Label or silkscreen
showing RTD
connection points.
The RTD sensor
must be
disconnected
during calibration.

4-20mA

output

RTD

mA

+

–

(–)

(+)

Flows from transmitter into calibrator

Excitation Current

of Model T130

1

2

(+)

Top View

5

3

4

(–)

2 431

GENERAL DESCRIPTION

The T130 is designed to be a simple to use,
high accuracy RTD Calibrator capable of either
simulating or reading several common RTD
Types. When being used as an RTD simulator
the T130 can calibrate a wide range of RTD
Transmitters and recording devices due to its
low excitation current capability. The step and
scroll keys allow the user to make output
changes quick and easily.

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 repor t 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 the jack identification label on back
of unit and how the test leads are connected for
the specific application.

OPERATING PROCEDURE

1. Turn on power and select desired RTD type by
depressing the Range key. Once the desired
range has been selected it will remain in memo­ry until a new range is selected.

2. Select either input or output by depressing the
In/Out key.

NOTE:The display will read “OPEN” if the unit
is not connected to either an RTD or RTD mea­suring device.

3. Connect the T130 to the device under test as
shown in the operating modes section.

4. If you are using the T130 in the output mode
use the Step or Scroll keys to set 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. RTD Simulation Mode
One of the most common uses of the T130 is

for simulating an RTD when calibrating an RTD
measuring device such as a transmitter, data
logger, PLC or similar product.To understand
how to calibrate an RTD measuring device, it’s
important to have a general understanding of
how an RTD operates.

By design, an RTD is a resistive sensor which
changes its resistance value (ohms) as a
function of temperature.Unlike a thermocouple,
it does not “put out” a voltage or current but is
strictly a passive device.Because of this, a
current must be passed through the RTD so
that a voltage can be developed across the
RTD and then amplified by the measuring
device.Ohm’s Law is a simple algebraic
expression which describes the relations
between voltage, current and resistance.

Ohm’s Law states: V = I x R

where V = Voltage

I = Current
R = Resistance

From this equation, we can see that the voltage
developed across the RTD is equal to the
current traveling through it times its resistance.
Therefore, for a fixed current, the voltage
measured will be directly proportional to the
temperature.

Figure 1 illustrates a typical example of how an
RTD transmitter measures an RTD sensor
using a fixed current.

Figure 1

In this example a two-wire RTD transmitter is
being calibrated using the T130 in the
simulation mode.The transmitter under test
supplies an excitation current into the calibrator
and the calibrator adjusts the voltage drop at
the terminals to yield the desired resistance for
a given temperature.For the T130 to operate
properly the excitation current must be in the
range of 0.125mA to 2mA and the polarity must
be correct.Too low of excitation current or
pulsed excitation current will be indicated by the
word “OPEN”flashing on the display.Reverse
polarity will be indicated by “REV.POL” on the
display. If your device requiring calibration has a
pulsed excitation current refer to the PTC-9002.

The example in Figure 1 shows an RTD
Transmitter with the RTD sensor having two
connection points. In many cases, however,
RTD devices have 3 and 4 wire connections.

Two-wire Tran smitter

Label or silkscreen

with two-wire RTD
showing RTD
connection points.
The RTD sensor
must be
disconnected
during calibration.

4-20mA

RTD

mA

–

+

output

(–)

(+)

Flows from transmitter into calibrator

Excitation Current

Top View

of Model T130

1

2

(+)

5

3

4

(–)