Ranges: 24-72″, 24-240″
Narrow Beam
Explosion Proof
On/Off Output with analog capability

Product Description

  • Various Sensing Ranges
  • Narrow Sensing Beam
  • Low Frequency – 37kHz
  • LED Indicator
  • Stainless Steel Housing
  • Remote Transducer
  • RPS-500 Compatible
  • 3-Way Power Operation
  • Isolated Form C Relay Output
  • Explosion Proof

The RPS-326 is a low frequency, sealed transducer sensor best suited for applications where harsh or hazardous environments are a problem. The transducer head is constructed of 316 grade stainless steel and has a CSA explosion-proof rating. The RPS-326 sensor head CSA rating is Class 1, Division 1, Group ABCD. The ranging and proximity modes provide the versatility of simple detection, or actual distance measuring.

The isolated form C relay furnishes N.O. and N.C. outputs, and with the addition of the RPS-500 card various analog outputs are supplied. The RPS-326 sensor, which operates at a frequency of 37kHz, has a narrow sensing beam. Sensing ranges available for the RPS-326 include 24″ to 72″, and 24″ to 240″. Mounting flanges, LED indicator, ranging potentiometer and 30ft. transducer cable are included. Optional cable lengths are available.

[Download not found]

Proximity Detection

Proximity detection is the detection of an object in a given range. The detection range of the RPS-326 is controlled by the “Range Control” potentiometer located on the front cover of the controller. Any object within the desired range is detected, while objects out of range are ignored. The detect point is independent of size, material, and reflectivity. The Proximity Option is denoted by the part number RPS-326-72.

Ranging Measurement

With the addition of the RPS-500 card, Analog outputs of 0-10 VDC and 4-20 mA are provided. Precise distances of an object moving to and from the transducer are measured via time intervals between transmitted and reflected bursts of ultrasonic sound. The example shows a target detected at 6 inches from the transducer and moving to 10 inches. The distance change is continuously calculated and outputted. Ranging Option is indicated by following the part number with (-500). (Example: RPS-326-72-500)

Operational Range: Adjustable 24″ to 72″
Adjustable 24″ to 240″
Power Input: 120VAC
* Only 120VAC or 24VDC
with 500 Analog card.
20-30 VDC
Input Current:
Input Current with 500 card:
Transducer Temperature:
200 Milliamps
250 Milliamps
-40ºC to 88ºC
or -40ºF to 190ºF
Humidity: 0 to 95% Non-condensing
Transducer Housing:
Output: N.O., N.C.
Metal Enclosed
316 Grade Stainless Steel
Isolated Form C Relay
.5 Amp Maximum at 120 VDC
Output with 500 card: 0 – 10VDC, 4 – 20 mA
Analog Outputs
with Zero, Span, Sample,
and Hold controls.
Transducer Frequency: 37 kHz
Response Time: 24″ to 72″ 24″ to 240″
On – 100mS – 2S – 250mS – 2S
Off – 100mS – 2S – 250mS – 2S
Weight of Controller: 34.2 ounces
Weight of Transducer: 19 ounces


  1. Angle of Tilt
  2. Beam Spread
  3. Wiring Diag. – For RPS-326
  4. Wiring Diag. – For RPS-500
  5. Delay Controls – For RPS-326
  6. Mounting Dimensions


24″ – 72″
24″ – 240″
24″ – 72″
24″ – 240″
Isolated Form C Relay
Isolated Form C Relay
0 – 10VDC and 4 – 20mA Analog
0 – 10VDC and 4 – 20mA Analog
24″ – 72″
24″ – 240″
24″ – 72″
24″ – 240″
Isolated Form C Relay – Explosion Proof
Isolated Form C Relay – Explosion Proof
0 – 10VDC and 4 – 20mA Analog – Explosion Proof
0 – 10VDC and 4 – 20mA Analog – Explosion Proof