red lion IRMA DC Manual

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MODEL IRMA DC -
DESCRIPTION
The IRMA accepts an RTD or resistance input and converts it into a voltage
or current output. The output is linearly proportional to the temperature or
resistance input. This output is ideal for interfacing to indicators, chart
recorders, controllers, or other instrumentation equipment.
The IRMA is DC powered. The DC power input is isolated from the signal
input and analog output. The unit scales the analog output proportionally to the
RTD or resistance input signal. The analog output may be configured for one of
the following: 0 to 20 mA, 4 to 20 mA, or 0 to 10 VDC. Making the signal
conversion with the IRMA to a current output signal, makes the signal less
susceptible to noise interference and allows accurate transmission over long
distances. The 3-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
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.
DIMENSIONS In inches (mm)
3.12
(79.2)
MC2234X
ORDERING INFORMATION
MODEL NO. DESCRIPTION
IRMA Intelligent RTD Module
INTELLIGENT RTD MODULE WITH ANALOG OUTPUT
1.08
(27.5)
POWER
IRMA
ERROR
PART NUMBER
IRMA3035
 USER PROGRAMMABLE INPUT

(RTD alpha = 0.00385 (DIN 43760), alpha = 0.00392, or resistance)
  MICROPROCESSOR CONTROLLED
  SIMPLE ADJUSTABLE RANGE SETTING (Using Input Signal)
  RTD BREAK DETECTION
  MOUNTS ON "T" AND "G" STYLE DIN RAILS
  3-WAY ELECTRICAL ISOLATION (POWER/INPUT/OUTPUT)
  MULTIPLE ANALOG OUTPUTS (0 to 20 mA, 4 to 20 mA, and 0 to
10 VDC)
 WIDE OPERATING TEMPERATURE RANGE (-25°C to 75°C)

 LED INDICATION (POWER & MEMORY ERROR)

 9 to 32 VDC POWERED

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.
CAUTION: Read complete instructions prior
to installation and operation of the unit.

SPECIFICATIONS

1. POWER: 9 to 32 VDC; 1.75 W. 200 mA max. current. The power supply
must have 400 mA for 200 msec. surge capacity.
2. INPUT: RTD 2, 3, or 4 wire, 100 ohm platinum, alpha = 0.00385
(DIN 43760), alpha = 0.00392, or resistance [selectable via DIP switches].
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 performed with equivalent series resistance.
3. OUTPUT: All output signals scaled linearly using temperature or resistance
input. Unit is shipped set for the 4 to 20 mA output. 4 to 20 mA or 0 to 20
mA selected via internal jumper.
Voltage Output Compliance:
0 to 10 VDC across min. 1 K load (10 mA)
20 mV peak to peak max. ripple (for frequencies up to 120 Hz)
Current Output Compliance:
0 to 20 mA through max. 600 load (12 VDC)
4 to 20 mA through max. 600 load (12 VDC)
15 mV peak to peak max. ripple across 600 load (for frequencies up to
120 Hz)
4. RTD BREAK DETECTION: Nominal values shown in the following order:
(0 to 20 mA, 4 to 20 mA, and 0 to 10 VDC).
Upscale: 22.9 mA, 22.5 mA, and 11.5 VDC
Downscale: -0.5 mA, 3.5 mA, and -0.4 VDC
5. RESPONSE TIME: 400 msec. (to within 99% of final value w/step input;
typically, response is limited to response time of probe.)
6. TEMPERATURE EFFECTS:
Temperature Coefficient:  0.025% of input range per C
7. DIELECTRIC WITHSTAND VOLTAGE: 1500 VAC for 1 minute
Working Voltage: 50 VAC
Power input to Signal input, Power input to Signal output, & Signal input to
Signal output.
1
Bulletin No. IRMA-E
Drawing No. LP0437
Released 02/10