0 basic calibration – Red Lion IRMA User Manual
Page 5
5
ERROR
POWER
VDC+
10
RTD(S)
7
V+
4
I+
1
VDC-
RTD(+)
12
11
9
8
6
5
V-
3
2
I-
POWER SUPPLY
9 to 32 VDC
VOLTAGE METER
OR
CURRENT METER
MONITORING INSTRUMENT
RTD(-)
ADJUSTABLE
RESISTANCE
SOURCE
-
+
S
Basic Calibration Wiring
The Basic Calibration should only be performed with an ambient temperature between
21°C and 29°C. The Basic Calibration was performed on the unit at the factory and
generally does not need to be done again. This procedure initializes the unit by calibrating
the input. The Basic Calibration should be performed only if a condition exists as
described in the “Unit Malfunction” section. After completion of this calibration, the unit
needs to be scaled in Field Calibration. The Basic Calibration procedure is described
below.
Note: To abort this calibration and reset to the previous settings, set the BASIC CAL
switch(#3) OFF prior to the final setting of the OUTPUT CAL switch (#1) (Step 4.17)
and turn off power for 5 seconds. Then turn on power and the previous settings will be
loaded.
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)
2.1 Connect an adjustable resistance source with an accuracy of 0.03% to the RTD input
terminals using a third sense wire. Set the RANGE (#7& #8), TYPE (#4), OUTPUT
CAL (#1), and FIELD CAL (#2) switches OFF. Set the BASIC CAL switch (#3) ON.
2.2 Apply operating power and allow a 45 minute warm-up period. [Current goes to -0.9
mA, 3.4 mA, or -0.5 V(nominal)]
2.3 Set the OUTPUT CAL switch (#1) ON and then OFF.
2.4 Set the resistance source to 40 ohms and wait 5 seconds.
2.5 Set the OUTPUT CAL switch (#1) ON and then OFF.
2.6 Set the resistance source to 60 ohms and wait 5 seconds.
2.7 Set the OUTPUT CAL switch (#1) ON and then OFF.
2.8 Set the resistance source to 100 ohms wait 5 seconds.
2.9 Set the OUTPUT CAL switch (#1) ON and then OFF.
2.10 Set the resistance source to 175 ohms and wait 5 seconds.
2.11 Set the OUTPUT CAL switch (#1) ON and then OFF.
2.12 Set the resistance source to 250 ohms and wait 5 seconds.
2.13 Set the OUTPUT CAL switch (#1) ON and then OFF.
2.14 Set the resistance source to 315 ohms and wait 5 seconds.
2.15 Set the OUTPUT CAL switch (#1) ON and then OFF.
2.16 Set the BASIC CAL switch (#3) OFF. [Current increases to 3.6 mA (nominal) or
more]
2.17 Perform a Field Calibration. (See Section 1.0)
2.0 Basic Calibration
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
ON
3
1 2
5
4
6 7 8
Step 2.1
Steps 2.3 to 2.15
Step 2.16
DIP SWITCH SETTINGS:
ON = 1
OFF = 0
9-32 VDC
V+
I+
VDC+
RTD(S)
POWER
RTD(-)
RTD(+)
VDC-
9
ERROR
7
8
12
10
11
6
3
4
1
5
2
V-
I-
5
1
4
3
2
8
7
6
RANGE
RANGE
OHMS/RTD
FIELD CAL
BASIC CAL
OUTPUT CAL
392
SEN UP/DN
MODEL IRMA