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IRMA - optical sensor for single gas detection

IRMA is an optical sensor for single gas detection, a successor to madIR-D - the best selling OEM solution in madur's portfolio.
Improved construction is followed by new options and features such as implementation of MODBUS protocol and two strong “open-drain” type outputs that allows to steer external loads like pumps, valves, relays, etc.
IRMA is ready to detect more gases than its predecessor, expanding the list of SF6, SO2, CF4, C4F8.
It can be equipped with LED display (visible from long distances).
Thanks to its modular construction it can be easily adapted to various OEM applications.

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Main features

  • Available for gases: CO, CO2, CH4, N2O, SO2, SF6, CHF3, CF4, C4F8
  • Current analogue output (0/4÷20mA) and voltage analogue output (0÷5/10V)
  • MODBUS protocol ready
  • Optional diaphragm pump
  • Optional solenoid valve for automatic ventilation and zeroing
  • Optional LED display
  • Optional aluminium chassis for sensor and its equipment
  • Two strong “open-drain” type outputs that allows to steer external loads like pumps, valves, relays, etc.
  • PC program to adjust the analyser's settings and to view the results

General view of IRMA

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Accessories

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1. General parameters

Dimensions (H x W x D) 70 mm * 123 ÷ 224mm * 40 mm
Weight (depends on sensor) 60 g ÷ 300 g
Storing temperature 0°C ÷ 60°C
Operating conditions T: 10°C ÷ 50°C; RH: 5%÷90% (non condensing)
Power supply 14 V DC ÷ 40 V DC
Communication interface with PC computer MODBUS 485 / RS485
Display (optional) LED | connected via I2C bus
Gas pump (optional) Membrane | 12VDC |1.5l/min (90l/h) - with automatic flow control
Solenoid valve (optional) 3-way | 12VDC
Current analogue outputs 1 output 0 mA ÷ 20 mA or 4 mA ÷20 mA
Voltage analogue outputs 1 output 0 V ÷ 5 V or 0 V ÷ 10 V
Open drain 2 relay outputs

2. Measurements of gas components

Table below shows the possible senors/ranges of IRMA.

Component Method Range | resolution Accuracy Time (T90)
CO – Carbon monoxide NDIR 10% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CO – Carbon monoxide NDIR 25% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CO – Carbon monoxide NDIR 50% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CO – Carbon monoxide NDIR 100% | 0.1% ± 0.5% abs. or 5% rel. 45 sec
CO2 – Carbon dioxide NDIR 1% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CO2 – Carbon dioxide NDIR 5% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CO2 – Carbon dioxide NDIR 10% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CO2 – Carbon dioxide NDIR 25% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CO2 – Carbon dioxide NDIR 100% | 0.1% ± 0.5% abs. or 5% rel. 45 sec
CH4 – Methane NDIR 1% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CH4 – Methane NDIR 5% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CH4 – Methane NDIR 10% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CH4 – Methane NDIR 25% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CH4 – Methane NDIR 100% | 0.1% ± 0.5% abs. or 5% rel. 45 sec
N2O – Nitrous oxide NDIR 2 000ppm | 0.1ppm ± 5ppm abs. or 5% rel. 45 sec
SO22 – Sulphur dioxide NDIR 10% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
SF6 – Sulfur Hexafluoride NDIR 1% | 0.001% ± 0.005% abs. or 5% rel. 45 sec
SF6 – Sulfur Hexafluoride NDIR 10% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
SF6 – Sulfur Hexafluoride NDIR 100% | 0.1% ± 0.5% abs. or 5% rel. 45 sec
CHF3 – Fluoroform (Refrigerant R23) NDIR 2.5% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
CF4 – Tetrafluoromethane NDIR 2.5% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
C4F8 – Octafluorocyclobutane (Refrigerant RC318) NDIR 1% | 0.01% ± 0.05% abs. or 5% rel. 45 sec
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