red lion IRMA Manual

MODEL IRMA - INTELLIGENT RTD MODULE WITH ANALOG OUTPUT
DESCRIPTION
The IRMA accepts a 2, 3, or 4 wire RTD or resistance 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 resistance input. This output is ideal for interfacing to
indicators, chart recorders, controllers, or other instrumentation equipment.
The IRMA 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 while consuming
less than 4 mA for operation. The conversion to a current output signal makes
the IRMA less susceptible to noise interference and allows accurate
transmission over long distances. Two-Way isolation allows the use of
grounded RTD's which can provide additional noise reduction benefits.
The IRMA uses an eight 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 X 7.5 and 35 X 15, and G profile according to EN 50 035 - G 32.
DIMENSIONS In inches (mm)
CAUTION: Risk of Danger.
Read complete instructions prior to
installation and operation of the unit.
ORDERING INFORMATION
MODEL NO. DESCRIPTION
IRMA Intelligent RTD Module
PART NUMBER
IRMA2003
1
USER PROGRAMMABLE INPUT
(RTD alpha=0.00385 (DIN 43760), alpha=0.00392, or resistance)
12 to 42 VDC LOOP POWERED (4 to 20 mA Output)
MICROPROCESSOR CONTROLLED
SIMPLE ADJUSTABLE RANGE SETTING (Using Input Signal)
RTD BREAK DETECTION
MOUNTS ON "T" AND "G" STYLE DIN RAILS
2-WAY ELECTRICAL ISOLATION (INPUT/OUTPUT & POWER)
HIGH-DENSITY PACKAGING (22.5 mm wide)
WIDE OPERATING TEMPERATURE RANGE
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.
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: RTD 2, 3, or 4 wire, 100 ohm platinum, alpha=0.00385 (DIN
43760), alpha=0.00392, or resistance [selectable via DIP switch]
Excitation: 0.170 mA nominal
Lead resistance: Less than 0.5°C with 15 ohms max. per lead
Note: There is no lead compensation for 2 wire input. Field calibration
should be accomplished with equivalent series resistance.
3. OUTPUT: 4 to 20 mA Linear output with Temperature or resistance input.
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 + 0.1°C [Conformity]) at 23°C after 20 min.
warm-up, conforming to ITS-90.
Note: RTD conformity does not apply to resistance 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.
Range Accuracy:
TYPE RANGE
INPUT RANGE
0
1
RTD alpha = 0.00385
2
3
0
1
RTD alpha = 0.00392
2
3
0
1
OHMS
2
3
Note: DIP switch settings ON = 1
Bulletin No. IRMA-E
Drawing No. LP0393
Released 7/06
DIP SWITCH
TEMPERATURE &
OHMS RANGE ACCURACY
4 6 7 8
0 0 0 0 -160 to 654°C ± 0.61°C
± 0.24°C
0 0 0 1 -108 to 207°C
0 0 1 0 -5 to 414°C ± 0.31°C
± 0.31°C
0 0 1 1 194 to 608°C
± 0.60°C
1 0 0 0 -157 to 640°C
1 0 0 1 -106 to 203°C ± 0.23°C
± 0.31°C
1 0 1 0 -5 to 406°C
± 0.30°C
1 0 1 1 190 to 596°C
Ω
0 1 0 0 35.5 to 331.0 ± 0.222
Ω
0 1 0 1 ± 0.091
57.0 to 178.5
Ω
± 0.116
0 1 1 0 98.0 to 252.0
Ω
0 1 1 1 173.5 to 316.5 ± 0.107
OFF = 0
RANGE
Ω
Ω
Ω
Ω