Red Lion ITMA User Manual

Bulletin No. ITMA-E

Drawing No. LP0382

Released 04/13

Tel [phone]

Fax [phone]

www.redlion.net

MODEL ITMA - INTELLIGENT THERMOCOUPLE MODULE WITH ANALOG OUTPUT

z USER PROGRAMMABLE INPUT

(THERMOCOUPLE TYPES J, K, T, & E, OR MILLIVOLT)

z 12 TO 42 VDC LOOP POWERED (4 TO 20 MA OUTPUT)

z MICROPROCESSOR CONTROLLED

z SIMPLE ADJUSTABLE RANGE SETTING (USING INPUT SIGNAL)

z THERMOCOUPLE BREAK DETECTION

z MOUNTS ON “T” AND “G” STYLE DIN RAILS

z 2-WAY ELECTRICAL ISOLATION (INPUT/OUTPUT & POWER)

z HIGH-DENSITY PACKAGING (22.5 MM WIDE)

z WIDE OPERATING TEMPERATURE RANGE

DESCRIPTION

The ITMA accepts a thermocouple or millivolt input and converts it into a 4
to 20 mA current output. The 4 to 20 mA output is linearly proportional to the
temperature or the millivolt input. This output is ideal for interfacing to
indicators, chart recorders, controllers, or other instrumentation equipment.

The ITMA is loop-powered which means that the same two wires are
carrying both the power and the output signal. The unit controls the output
current draw from 4 to 20 mA in direct proportion to the input change while
consuming less than 4 mA for power. The conversion to a current output signal
makes the ITMA less susceptible to noise interference and allows accurate
transmission over long distances. The 2-Way isolation allows the use of
grounded thermocouples which can provide additional noise reduction benefits.

The ITMA uses a ten position DIP switch to accomplish the input sensor
configuration, range selection, and unit calibration. A simple range setting
technique (Field Calibration) is used so the actual input signal adjusts the output
current for scaling. This technique eliminates the need for potentiometers which
are vulnerable to changes due to vibration.

The unit is equipped with a universal mounting foot for attachment to
standard DIN style mounting rails, including top hat rail (T) according to EN 50
022 - 35 × 7.5 and 35 × 15, and G profile according to EN 50 035 - G 32.

SAFETY SUMMARY

All safety related regulations, local codes and instructions that appear in the
manual or on equipment must be observed to ensure personal safety and to
prevent damage to either the instrument or equipment connected to it. If
equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.

DIMENSIONS In inches (mm)

.886

(22.5)

M2068B

123

+

TC

ITMA

POWER/
OUTPUT

+

456

-

-

RED LION CONTROLS

4

SWITCH

ICE POINT

YORK, PA.MADE IN U.S.A.

TEST

MODEL ITMA

1

0

ENABLED

DISABLED

3.11 (79.0)

31086579

FIELD CAL

BASIC CAL

OUTPUT CAL

1

5

0

UP

DOWN

OPEN SEN

421

ICE PT EN/DIS

867

TC TYPE

TC TYPE

OPEN SEN DN/UP

001001

000

J

M2069A

ON

RANGE

TC TYPE

TC TYPE

110

T

E

K

OFF = 0

RANGE

ON = 1

DIP SWITCH SETTINGS:

1011

01

10

9

0

0

111

1

2

0

MV

RANGE

3.30

(83.8)

3

ORDERING INFORMATION

MODEL NO. DESCRIPTION PART NUMBER

ITMA Intelligent Thermocouple Module ITMA2003

CAUTION: Read complete Instructions prior

to installation and operation of the unit.

SPECIFICATIONS

1. POWER: 12 to 42 VDC *(Loop powered). The power supply must have a
30 mA min. capacity.
[* Min. voltage must be increased to include the drop across any current

display indicator]

2. INPUT: J, K, T, E, mV [selectable via DIP switch]

3. OUTPUT: Loop powered (passive), 4 to 20 mA Linear output
Ripple: Less than 15 mV peak-to-peak max., across 250Ω load resistor (up

to 120 Hz frequencies).

4. RANGE & ACCURACY: (12 Bit resolution)
Accuracy: ± ( 0.075% Range + 0.25°C [Conformity] + 0.50°C [Ice Point])

at 23°C after 20 min. warm-up, conforming to ITS-90.

Note: TC Conformity and Ice Point do not apply to mV input.

Relative Humidity: Less than 85% RH (non-condensing)
Span: The input span can be set to a min. of 1/8 of the full scale range,

anywhere within that range.

Thermocouple Accuracy for each type and the corresponding ranges:

RANGE

DIP SWITCH

TYPE RANGE
6 7 8 9 10

TEMPERATURE

& mV RANGE

RANGE

ACCURACY

TC

(INPUT)

0 0 0 0 0 0 -136 to 111°C ± 0.19°C
1 0 0 0 0 1 69 to 575°C ± 0.38°C
2 0 0 0 1 0J338 to 800°C ± 0.35°C
3 0 0 0 1 1 -149 to 862°C ± 0.76°C
0 0 0 1 0 0 -200 to 541°C ± 0.56°C
1 0 0 1 0 1 427 to 1132°C ± 0.53°C

K

2 0 0 1 1 0 648 to 1372°C ± 0.54°C
3 0 0 1 1 1 -192 to 1372°C ± 1.17°C
0 0 1 0 0 0 -225 to 149°C ± 0.28°C
1 0 1 0 0 1 74 to 326°C ± 0.19°C

T

2 0 1 0 1 0 68 to 400°C ± 0.25°C
3 0 1 0 1 1 -200 to 400°C ± 0.45°C
0 0 1 1 0 0 -111 to 311°C ± 0.32°C
1 0 1 1 0 1 276 to 609°C ± 0.25°C

E

2 0 1 1 1 0
3 0 1 1 1 1
0 -9 to 6 mV ± 0.0113 mV

1 1 1 0 0

1 1 1 1 0 1 -9 to 22 mV ± 0.0233 mV

mV

2 1 1 1 1 0 -9 to 63 mV ± 0.0540 mV

377 to 1000°C ± 0.47°C

-114 to 1000°C ± 0.84°C

3 1 1 1 1 1 -9 to 77 mV ± 0.0645 mV

Note: DIP switch settings ON = 1 OFF = 0

Accuracy Example:

Type “J” Range “0”

-136°C to 111°C

Range

( ±0.19°C + ±0.25°C + ±0.50°C ) = ±0.94°C

Conformity

WIRE COLOR

BS1843ANSI

White (+)

Red (-)

Yellow (+)

Red (-)

Blue (+)

Red (-)

Violet (+)

Red (-)

Yellow (+)

Blue (-)

Brown (+)

Blue (-)

White (+)

Blue (-)

Brown (+)

Blue (-)

N/AN/A

Ice Point Total Error

1

5. TC BREAK DETECTION: Upscale to 22.5 mA (nominal) or Downscale to

3.6 mA (nominal) [selectable via DIP switch]

6. RESPONSE TIME: 400 msec (to within 99% of final value w/step input;
typically, response is limited to response time of probe.)

7. ENVIRONMENTAL CONDITIONS:

Operating Temperature Range: -25°C to 75°C (-13°F to 167°F)
Storage Temperature Range: -40°C to 85°C (-40°F to 185°F)
Operating and Storage Humidity: 85% max. (non-condensing) from -25°C

to 75°C.

Vibration to IEC 68-2-6: Operational 5-150 Hz, 2 g
Shock to IEC 68-2-27: Operational 30 g
Temperature Coefficient: ± 0.01% of input range per °C
Ice Point Compensation: ± 0.75°C for a 50°C change in temperature
Altitude: Up to 2000 meters.

8. DIELECTRIC WITHSTAND VOLTAGE: 1500 VAC for 1 minute, at 50
VAC working volts, from Input to Output

9. CERTIFICATIONS AND COMPLIANCES:

CE Approved

EN 61326-1 Immunity to Industrial Locations
Emission CISPR 11 Class A
IEC/EN 61010-1

Refer to the EMC Installation Guidelines section of this bulletin for

additional information.

10. MOUNTING: Universal mounting foot for attachment to standard DIN
style mounting rails, including top hat (T) profile rail according to EN50022

- 35 × 7.5 and 35 × 15, and G profile rail according to EN50035 - G32.

11. CONNECTION: Compression type terminal block

12. CONSTRUCTION: High impact black plastic case. Installation Category I,
Pollution Degree 2.

13. WEIGHT: 2.7 oz (76.54 g)

BLOCK DIAGRAM

3V

FACTORY SETTINGS

The unit is shipped from the factory calibrated for a 4 to 20 mA output using
a type J thermocouple in range 3. The ITMA should be Field calibrated by the
operator for the application environment it will be used in. If the unit is not
recalibrated by the operator, the following table lists the temperature ranges for
the given thermocouple types.

TYPE RANGE TEMPERATURE RANGE

J 3 -50°C to 500°C

K 3 -85°C to 790°C

T 3 -195°C to 162°C

E 3 3°C to 602°C

WIRING CONNECTIONS

All conductors should meet voltage and current ratings for each terminal.
Also, cabling should conform to appropriate standards of good installation,
local codes and regulations. It is recommended that power supplied to the unit
be protected by a fuse or circuit breaker. When wiring the unit, use the numbers
on the label to identify the position number with the proper function. Strip the
wire, leaving approximately 1/4" (6 mm) of bare wire exposed (stranded wire
should be tinned with solder). Insert the wire into the terminal, and tighten the
screw until the wire is clamped tightly.

TC

1-2 3

+

TC

22M

PWM

CONTROL

CIRCUITRY

LOOP

POWER

CIRCUITRY

4
POWER/
OUTPUT

5

TC

1

+

­2

A/D

CONVERTER

1.7V

4V

3V

1.7V

PROCESS

CIRCUITRY

POWER

SUPPLY

FUNCTION DESCRIPTIONS

Open Sensor Detection

The output can be set to go Upscale or Downscale for the detection of an
open sensor. The Upscale setting makes the output go to 22.5 mA (nominal).
The Downscale setting makes the output go to 3.5 mA (nominal). This setting
is always active, so changes in the setting are effective immediately.

Ice Point Compensation

The Ice Point Compensation for the thermocouple sensors can be enabled (DIP
Switch OFF) or disabled (DIP Switch ON). The mV sensor input is not affected
by this setting. Generally, the Ice Point Compensation is always enabled.

Calibration Malfunction

If the unit has scaling problems (current remains at 3.5 mA nominal), check
the voltage between the TC- Input (-) and TEST pad (+) [located next to the DIP
switches on the side of the unit]. For normal operation the voltage is -1.77 V
(nominal). If the voltage is +1.23 V(nominal), a problem occurred storing
information in the E2PROM. When this happens, perform a Basic Calibration
and then a Field Calibration. Turn off power for 5 seconds. Turn on power and
check the voltage between the TEST pad (+) and TC- Input (-). If the voltage is
still +1.23 V(nominal), contact the factory.

ITMA

POWER/
OUTPUT

M2068B

+

4 5-6

12 to 42 VDC

Power Supply

±

4 to 20 mA

Current Display

Indicator or

A

Monitoring

Instrument

EMC INSTALLATION GUIDELINES

Although Red Lion Controls Products are designed with a high degree of
immunity to Electromagnetic Interference (EMI), proper installation and wiring
methods must be followed to ensure compatibility in each application. The type
of the electrical noise, source or coupling method into a unit may be different
for various installations. Cable length, routing, and shield termination are very
important and can mean the difference between a successful or troublesome
installation. Listed are some EMI guidelines for a successful installation in an
industrial environment.

1. A unit should be mounted in a metal enclosure, which is properly connected

to protective earth.

2. Use shielded cables for all Signal and Control inputs. The shield connection

should be made as short as possible. The connection point for the shield

depends somewhat upon the application. Listed below are the recommended

methods of connecting the shield, in order of their effectiveness.

a. Connect the shield to earth ground (protective earth) at one end where the

unit is mounted.

b. Connect the shield to earth ground at both ends of the cable, usually when

the noise source frequency is over 1 MHz.

3. Never run Signal or Control cables in the same conduit or raceway with AC

power lines, conductors, feeding motors, solenoids, SCR controls, and

heaters, etc. The cables should be run through metal conduit that is properly

grounded. This is especially useful in applications where cable runs are long

and portable two-way radios are used in close proximity or if the installation

is near a commercial radio transmitter. Also, Signal or Control cables within

an enclosure should be routed as far away as possible from contactors,

control relays, transformers, and other noisy components.

4. Long cable runs are more susceptible to EMI pickup than short cable runs.

2

5. In extremely high EMI environments, the use of external EMI suppression
devices such as Ferrite Suppression Cores for signal and control cables is
effective. The following EMI suppression devices (or equivalent) are
recommended:

Fair-Rite part number 0443167251 (RLC part number FCOR0000)
Line Filters for input power cables:

Schaffner # FN2010-1/07 (Red Lion Controls # LFIL0000)

6. To protect relay contacts that control inductive loads and to minimize radiated
and conducted noise (EMI), some type of contact protection network is
normally installed across the load, the contacts or both. The most effective
location is across the load.
a. Using a snubber, which is a resistor-capacitor (RC) network or metal oxide

varistor (MOV) across an AC inductive load is very effective at reducing
EMI and increasing relay contact life.

b. If a DC inductive load (such as a DC relay coil) is controlled by a transistor

switch, care must be taken not to exceed the breakdown voltage of the
transistor when the load is switched. One of the most effective ways is to
place a diode across the inductive load. Most RLC products with solid
state outputs have internal zener diode protection. However external diode
protection at the load is always a good design practice to limit EMI.
Although the use of a snubber or varistor could be used.
RLC part numbers: Snubber: SNUB0000
Varistor: ILS11500 or ILS23000

7. Care should be taken when connecting input and output devices to the
instrument. When a separate input and output common is provided, they
should not be mixed. Therefore a sensor common should NOT be connected
to an output common. This would cause EMI on the sensitive input common,
which could affect the instrument’s operation.

Visit RLC’s web site at http://www.redlion.net/Support/InstallationConsiderations.

html for more information on EMI guidelines, Safety and CE issues as they
relate to Red Lion Controls products.

INPUT AND POWER/OUTPUT CONNECTIONS

Input

When connecting the thermocouple, be certain that the connections are clean
and tight. The negative thermocouple lead is connected to Terminal #2 (TC-)
and the positive lead is connected to Terminal #1 (TC+). If the thermocouple
probe cannot be connected directly to the module, thermocouple wire or
thermocouple extension-grade wire must be used to extend the connection points
(copper wire does not work). Always refer to the thermocouple manufacturer’s
recommendations for mounting, temperature range, shielding, etc.

Power/Output

The unit has the power and current output sharing the same two wires (loop­powered). Connect DC power to terminals #4 and #5, observing the correct
polarity, with a current meter/indicator connected in between so that the output
current can be monitored. Be certain that the DC power is relatively “clean”
and within the 12 to 42 VDC range at the terminals. The current meter voltage
drop must be included in power supply considerations.

DIP SWITCH SETTING DESCRIPTIONS

SWITCH DESCRIPTION

1 OUTPUT CAL Output Calibration

2 FIELD CAL Field Calibration

3 BASIC CAL Basic Calibration

4 ICE PT EN/DIS

OPEN SEN DN/UPOpen Sensor Detection -

5

6

7

8

9

10

TC TYPE

RANGE

Ice Point Compensation -
Disabled (ON) / Enabled (OFF)

Upscale (ON) / Downscale (OFF)

Thermocouple Type - 3 switch
combination setting

Sensor Range - 2 switch
combination setting

TC Type and Range switch settings (ON = 1 OFF = 0)

TC TYPE

mV 1 1 1

DIP SWITCH

6 7 8 9 10

J 0 0 0 0 0 0

K 0 0 1 1 0 1

T 0 1 0 2 1 0

E 0 1 1 3 1 1

RANGE

DIP SWITCH

3