4
Note: The nominal output value for the various output ranges are designated in the
following order: (0 to 20 mA, 4 to 20 mA, 0 to 10 VDC)
This calibration procedure can be used to assign the high and low input values if a
thermocouple calibrator is not available.
Note: To abort this calibration and reset to the previous settings, set the FIELD CAL
switch(#2) OFF prior to the final OFF setting of the OUTPUT CAL switch (Step
2.12) and turn off power. Wait 5 seconds and then turn on power and the previous
settings will be loaded.
2.1 Connect the accurate Adjustable Millivolt Source to the TC input terminals.
2.2 Set the ICE PT EN/DIS switch (#4) ON to disable Ice Point Compensation.
2.3 Set the Type and Range for the thermocouple or mV used in your application
(DIP switches #6 through #10).(TC type “J”, Range 0 shown)
2.4 Set the FIELD CAL switch (#2) ON.[Output goes to -0.8 mA, 3.5 mA, or -0.4 V
nominal]
2.5 Apply the input signal (mV equivalent for the thermocouple temperature) for the
analog output low value.
2.6 Set the OUTPUT CAL switch (#1) ON. [Output stays at -0.8 mA, 3.5 mA, or -0.4
V nominal]
2.7 Adjust the input signal up until the output equals desired low value.
2.8 Set the OUTPUT CAL switch (#1) OFF. [Output increases to 22.9 mA, 22.5 mA,
or 11.5 V nominal]
2.9 Apply the input signal (millivolt equivalent for the thermocouple temperature) for
the analog output high value.
2.10 Set the OUTPUT CAL switch (#1) ON. [Output decreases to 21.1 mA, 20.7 mA,
or 10.6 V nominal]
2.11 Adjust the input signal down until the output equals desired high value.
2.12 Set the OUTPUT CAL switch (#1) OFF.
2.13 Set the FIELD CAL switch (#2) OFF.
2.14 Set the ICE PT EN/DIS switch (#4) OFF to enable Ice Point Compensation.
2.15 Disconnect millivolt source from the ITMA and connect the actual sensor to be
used in the application.
ERROR
POWER
VDC+
10
TC+
7
V+
4
I+
1
VDC-
TC-
12
11
9
8
6
5
V-
3
2
I-
POWER SUPPLY
9 to 32 VDC
+
-
VOLTAGE METER
OR
CURRENT METER
ADJUSTABLE
MILLIVOLT
SOURCE
1
6
5
4
3
2
10
9
8
7
ON
1
6
5
4
3
2
10
9
8
7
ON
1
6
5
4
3
2
10
9
8
7
ON
1
6
5
4
3
2
10
9
8
7
ON
1
6
5
4
3
2
10
9
8
7
ON
ON
1 2 3 4 5 6 7 8 9 10
4
1 2 3
ON
6
5
7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
Field Calibration Wiring
Step 2.2 & 2.3
Step 2.4
Step 2.6
Step 2.8
Step 2.10
Step 2.12
Step 2.13
Step 2.14
2.0 Field Calibration With an Accurate Adjustable Millivolt Source: (Alternate Method)
Note: The unit needs to have the Field Calibration completed by the operator before
normal operation. To abort this calibration and reset to the previous settings, set
the FIELD CAL switch(#2) OFF prior to the final OFF setting of the OUTPUT
CAL switch (Step 1.13) and turn off power. Wait 5 seconds and then turn on power
and the previous settings will be loaded.
Field Calibration with a Thermocouple Calibrator
1.1 Enable the Ice Point Compensation on the Thermocouple Calibrator and set it to
the Thermocouple type being used in your application.
1.2 Connect the thermocouple wire as selected in step 1 to the TC input terminals of
the ITMA and the thermocouple calibrator.
1.3 Set the ICE PT EN/DIS switch (#4) OFF to enable Ice Point Compensation.
1.4 Set the Type and Range for the thermocouple or mV used in your application
(DIP switches #6 through #10). (TC type “J”, Range 0 shown)
1.5 Set the FIELD CAL switch (#2) ON. [Output goes to -0.8 mA, 3.5 mA, or -0.4 V
nominal]
1.6 Apply the input signal for the analog output low value.
1.7 Set the OUTPUT CAL switch (#1) ON. [Output stays at -0.8 mA, 3.5 mA, or -0.4
V nominal]
1.8 Adjust the input signal up until the output equals desired low value.
1.9 Set the OUTPUT CAL switch (#1) OFF. [Output increases to 22.9 mA, 22.5 mA,
or 11.5 V nominal]
1.10 Apply the input signal for the analog output high value.
1.11 Set the OUTPUT CAL switch (#1) ON. [Output decreases to 21.1 mA, 20.7 mA,
or 10.6 V nominal]
1.12 Adjust the input signal down until the output equals desired high value.
1.13 Set the OUTPUT CAL switch (#1) OFF.
1.14 Set the FIELD CAL switch (#2) OFF.
1.15 Disconnect the thermocouple calibrator from the ITMA and connect the actual
sensor to be used in the application.
1
6
5
4
3
2
10
9
8
7
ON
1
6
5
4
3
2
10
9
8
7
ON
1
6
5
4
3
2
10
9
8
7
ON
1
6
5
4
3
2
10
9
8
7
ON
1
6
5
4
3
2
10
9
8
7
ON
1
6
5
4
3
2
10
9
8
7
ON
1
6
5
4
3
2
10
9
8
7
ON
Step 1.13
Step 1.3 & 1.4
Step 1.5
Step 1.7
Step 1.9
Step 1.11
Step 1.14
OUTPUT CAL
FIELD CAL
BASIC CAL
ICE PT DIS/EN
OPEN SEN DN
RANGE
RANGE
DIP SWITCH SETTINGS:
ON = 1
OFF = 0
TYPE
TC
TC TYPE
MODEL ITMA
9-32 VDC
ERROR
POWER
VDC+
10
TC+
7
V+
4
I+
1
VDC-
TC-
12
11
9
8
6
5
V-
3
2
I-
4
2
1
3
7
5
6
8
10
9
ERROR
POWER
VDC+
10
TC+
7
V+
4
I+
1
VDC-
TC-
12
11
9
8
6
5
V-
3
2
I-
POWER SUPPLY
9 to 32 VDC
+
-
VOLTAGE METER
OR
CURRENT METER
THERMOCOUPLE
CALIBRATOR
Field Calibration Wiring
Note: The nominal output value for the various output ranges are designated in the following order: (0 to 20 mA, 4
to 20 mA, 0 to 10 VDC)
Allow a 30 minute warm-up period before starting Field Calibration. Field Calibration scales the voltage or current
output to a temperature or mV input. This procedure assigns an input value to analog output low and an input value
to analog output high. The microprocessor handles configuring the output so it is linear to the temperature or mV input.
The Field Calibration procedure is described below.
1.0 Field Calibration
CALIBRATION PROCEDURES
OUTPUT CAL
FIELD CAL
BASIC CAL
ICE PT DIS/EN
OPEN SEN DN
RANGE
RANGE
DIP SWITCH SETTINGS:
ON = 1
OFF = 0
TYPE
TC
TC TYPE
MODEL ITMA
9-32 VDC
ERROR
POWER
VDC+
10
TC+
7
V+
4
I+
1
VDC-
TC-
12
11
9
8
6
5
V-
3
2
I-
4
2
1
3
7
5
6
8
10
9
