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RPS-409A-IS2 Intrinsically Safe Analog Ultrasonic Sensor

Certified Safe for Use In Explosive Atmospheres

  • Intrinsically Safe “ia”
  • Input Voltage 16-30 VDC
  • Reverse Polarity Protected
  • Analog Voltage Output
  • Short Circuit Protected
  • Sync/Tx Input Line
  • Various Sensing Ranges
  • Wide Temperature Range
  • Temperature Compensation
  • LED Indicator
  • Self Contained Sensor
  • PPS or PVC Enclosure
  • No Training Required

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About the RPS-409A-IS2 Sensor

Migatron’s second generation of intrinsically safe ultrasonic sensors are certified for use in Hazardous (Classified) Locations and Explosive Atmospheres. The RPS-409A-IS2 is one of the first sensors ever to receive an ANZEx certificate for use in Australia and New Zealand. It has also been certified in Europe, the United States, and Canada. These sensors can be used in hazardous gas or dust environments classified as Zone 0, 1, 2, 20, 21 or 22 for ANZEx/ATEX/IECEx and Class I, II or III for C-UL-US when used with approved intrinsic safety barrier(s). The RPS-409A-IS2 is completely sealed with an IP67 rating.

There is no calibration necessary, and no training required. Just apply power to the sensor and the output voltage will tell you precisely how far away the target is. For instance, the RPS-409A-40-IS2 measures distances in a range from 4 to 40 inches and produces 0.25 V for every inch between the sensor and the target. When the target is four inches away, the output voltage is 1.00 V. When the target is ten inches away, the output voltage is 2.50 V and so on. This relationship is linear throughout the range of the sensor, so it’s easy to translate output voltage into distance.

In addition to the analog voltage output line, each sensor also has a Sync/Tx line which can be used for connecting multiple sensors together to prevent cross talk (Sync), or to control when the sensor transmits (Tx).

The RPS-409A-IS2 is designed to take advantage of today’s PLC and computer analog input cards. The numerical values that are programmed into the PLC or computer will determine the zero and span of the sensor.

Each sensor is short-circuit protected for safety and has built-in temperature compensation to provide accurate readings throughout the entire operating temperature range.

An LED indicator, on the back of the sensor, is green when the sensor is not detecting a target and red when a target is detected.

No Training Required. The Intelligence is Built In.

Migatron’s 409A sensors are pre-calibrated from the factory and require no training. With a linear relationship between voltage output and distance to the target, it’s a very straight-forward process to program any PLC to interpret the results.

The RPS-409A-40-IS2, for instance, yields 0.25 volts per inch. So when the target is placed four inches from the sensor, the output is 1.00 V. When the target is ten inches from the sensor, the output is 2.50 V. At forty inches, the output is 10.00 V.

Learn how our ultrasonic sensors work.


Entity Parameters:

See Control Drawing No. Ex05021114

Power Input:

16 – 30VDC Reverse Polarity Protected

(A minimum of 24VDC must be applied
to the safety barrier)

Input Current:

24mA maximum with 24VDC
applied to the safety barrier

Ambient Temperature:

-40 to +60°C or -40 to +140°F


0 – 95% Non-Condensing

Outputs:Analog Voltage Output
(Load 100k Ohms to infinity)
Short Circuit Protected

Enclosure Material:

Polyphenylene Sulfide (PPS)
Enclosure with PPS and PTFE
sensing face, or
Polyvinyl Chloride (PVC)
Enclosure with PVC sensing face

Enclosure Rating:

IP67 (Mating cable must be
rated IP67 or higher.)

Response Time:40″ Models – 16ms
80″ Models – 35ms

3.7 ounces (105 grams)

Sensor with Jam Nuts:

4.2 ounces (118 grams)


Model Number:Sensor Range:Transducer Frequency:Response Time:
RPS-409A-40-IS24 – 40″175kHz100ms
RPS-409A-80-IS26 – 80″135kHz100ms
RPS-409A-40P-IS24 – 40″175kHz100ms
RPS-409A-80P-IS26 – 80″135kHz100ms
RPS-409A-144P-IS210 – 144″70kHz200ms
RPS-409A-216P-IS212 – 216″70kHz200ms

* Contact Migatron for other sensor ranges.

Sensor Range:Volts Per Inch:Voltage Output:
4 – 40″0.250

IV @ 4″ to 10.0V @ 40″

6 – 80″0.125

0.75V @ 6″ to 10.0V @ 80″

10 – 144″0.069

0.69V @ 10″ to 10.0V @ 144″

12 – 216″0.046

0.55V @ 12″ to 10.0V @ 216″


Explosion Protection and Approvals

Europe (ATEX)Australia and New Zealand (ANZEx)
DEMKO 12 ATEX 1103028XANZEx 13.3010X
The image is completely black, indicating either a blackout or an intentional dark image with no visible content. I M1 / II 1 GDEx ia I/IIC T4 Ma/Ga
Ex ia I/IIC T4 Ma/GaEx ia IIIC T101°C Da
Ex ia IIIC T101°C Da-40°C ≤ Ta ≤ +60°C
International (IECEx)Canada and USA (C-UL-US)
IECEx UL 12.0001XFile # E226209
Ex ia I/IIC T4 Ma/GaClass I, Division 1, Groups A, B, C, and D
Ex ia IIIC T101°C DaClass II, Division 1, Groups E, F, and G
-40°C ≤ Ta ≤ +60°CClass III, Division 1

Ordering Information

Part NumberRangeDescription
RPS-409A-40-IS24″ to 40″Analog Voltage Output with PPS Enclosure – Cable Sold Separately
RPS-409A-80-IS26″ to 80″Analog Voltage Output with PPS Enclosure – Cable Sold Separately
RPS-409A-40P-IS24″ to 40″Analog Voltage Output with PVC Enclosure – Cable Sold Separately
RPS-409A-80P-IS26″ to 80″Analog Voltage Output with PVC Enclosure – Cable Sold Separately
RPS-409A-144P-IS210″ to 144″Analog Voltage Output with PVC Enclosure – Cable Sold Separately
RPS-409A-216P-IS212″ to 216″Analog Voltage Output with PVC Enclosure – Cable Sold Separately
F32-54963022 meter Cable, M12 4-PIN IP67 18 AWG – Sold Separately
F32-54963055 meter Cable, M12 4-PIN IP67 18 AWG – Sold Separately
F32-54963186 meter Cable, M12 4-PIN IP67 18 AWG – Sold Separately
F50-9240905ZSB-409A Safety Barrier – Sold Separately
F33-5441504DIN Rail Grounding Block – Sold Separately


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