Christmas 2019

Christmas Tree

13th December 2019, Last day for processing customised orders.

18th December 2019, Last day for processing box stock orders.

19th December 2019, Last day for completed orders to be shipped.

20st December midday, The Last day of business for 2018. Orders can be received but will not be processed until the New Year.

2nd January 2020 APCS office re-opens for enquiries, phone assistance and processing of stock items. Orders for non-stock items and repairs will be accepted and processed on a case-by-case basis.

20st January 2020 Commencement of full production and the processing of orders.


2019 Short Form Catalogue

APCS Short Form Catalouge

Please email to request a printed copy or download the PDF.

Popular products are found using the 2019 Selection Grid, Input by Function.

2019 Short Form

2019 Short Form

2019 Function Page

2019 Function Page

There is a page for each product function along with the function definition which may help with ordering the product.

Products are listed by;

  • Case Type

  • Output / Supply Type


SL339 ac and Bipolar Isolator

The SL339-XA is a variant of the SL339-X0 and operates with bipolar and ac voltage input signals. The programming socket, under the front door flap is connected via an SL303 USB isolator to the SL300 Windows software. The user can select from the 11 output ranges with input shape control and output signal limits. One of the 12 input ranges is automatically set base on the entered input range.

SL339 Program

Bipolar Ranges

The bipolar ranges allow input measurements below zero which allows the process output to respond to an extended range of signals. The response time may be set using the 25mS, 400mS (Fast, Slow) switch.


ac Ranges

The ac ranges take multiple readings while detecting the zero crossing of the signal. After a complete cycle the ac value is calculated. This results in accurate amplitude measurement without ripple on signals as slow as 0.1Hz.

As a new measurement is available after each input cycle the system response is quicker as the frequency increases. The ‘Sample Time’ setting sets the fastest output update time, multiple readings are averaged. Slow measurements will at selected sample time or cycle period if longer.

Please refer to SL339 for more information.


SL350 arrives 1/4/19

The SL350 pulse frequency transmitter will replace the FRT150, PRM180, MFT184, FRT287 and the PFC750. All of these products required some form of factory calibration to customer order specification. These hardware modifications and complicated calibration procedures after various internal links are set. Changes in hardware are handled by up to six additional option switches in the order code.

The SL350 has all hardware included for all signals, probes, pulse voltage differences and measurement range from 1 pulse every 5 seconds to 180kHz full scale.

SL350 Pulse Frequency Transmitter

SL350 Pulse Frequency Transmitter

There are two models of the SL350;

  • SL350-20 used with supply voltages; 10-60Vdc / 16-42V 50/60Hz
  • SL350-10 used with supply voltages; 80-300Vdc / 80-280V 50/60Hz

The SL350-20 will arrive in stock on the 1 of March, the SL350-10 will be toward the end of 2019.

The unit does require configuration with a free windows app and the low cost SL303 USB isolator which can also be used with all other SL series products. Buy more than ten SL series modules at one time and request a free SL303-01 to be added to the shipment. Alternatively we will program the unit for you at no charge.

The SL350 will replace 99% of PRM180 applications. The SL350 will work with a full scale as low as 12 pulses per minute.

The PFC750 has two outputs while the SL350 only has one. A SL350 can be used with a SL339 to provide the additional isolated output. The two units together can be supplied at the same or lower price as one PFC750 and will still use less space on the DIN rail.

Please refer to SL350 - smart line home for more information.

APC258 and PLS257

The PLR255 has been replaced by the PLS257.

The APC253 has been replaced by the APC258.

Both the APC258 and PLS257 feature:

  • Two isolated pulse outputs.
  • Outputs can Sink or Sourced 3 - 22V Adjustable
  • Powered from a wider range power supply.
  • Output frequencies up to 10k Hz.

Inputs for the APC258 include AC/DC current & volts, resistance, RTD (Pt100), thermocouple, pH/ORP and pulse.

Inputs for the PLS257 include Low level ac, Low level pulse, DC pulse (200mVpp up to 50Vpp) and proximity sensors.




For more information go to


New more stream lined housing, now includes an external LED for indication of output plus easier mounting.

The RTT508 converts an RTD (Pt100) temperature signal to a dc process signal output and features:

  • 2-wire or 3-wire output loop power supplies.
  • Standard accuracy 1%, 0.5% optional.
  • Standard beige ABS enclosure.

For more information go to RTT508 - Room Temperature Transmitter


New housing with large plastic cover screws and extra mounting points.

  • 2-wire output loop power supplies.
  • Wide range light sensor to 140k lux.
  • IP65 rated polycarbonate enclosure.
  • Internal adjustments for span and zero.



For more information go to LUX510 - LUX Transmitter