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Products » Catalogue index » B12 Series instruments


B12 series signal conditioners and trip amplifiers


Module size 113mm high x 52mm wide x 106mm* deep (*add 22mm for units with front panel control). DIN rail mounting is available. Modules are a plug in type which permits pre-wiring of base section.

General info on B12 series instrumentation  B12 Series General information (PDF)

B12 Feature

mA input signal loops are maintained when module unplugged from base section


Signal conditioner - resistance / PRT inputs
Set-point generator
Millivolt signal conditioner / Bridge amplifier
• Loop-powered trip amplifier
Isolating signal conditioner
Single / dual output signal isolators / conditioners
Field configurable signal isolator / conditioner
Single / dual trip amplifiers
Programmable triple trip amplifier with display

Square root extractor
3/2 law
5/2 law
Frequency to analogue converter
Analogue to frequency converter
Rate limiter
Rate of change monitor


Signal Conditioner
For resistance
or PRT inputs

Converts inputs from resistance transducers e.g. variable resistances, potentiometers, resistance temperature detectors (RTD), platinum resistance thermometers (PRT), into standard voltage or current process signals. Input and output are not isolated from each other. B12-1 signal conditioner for resistance and PRT inputs

Signal converter informationSignal conditioner data sheet


Signal converter user guide Signal conditioner user guide


Set Point

Also see

Provide a current or voltage output, the magnitude of which is controlled either by:
• a front panel mounted control (adjustable type).
• a remote set-point with the set-point potentiometer and dial supplied loose for remote mounting e.g. in a control panel or enclosure door or
• a fixed output which is internally set to the level required.

B12 Set-point generator




Remote set-point



Fixed set point



Set-point generator informationSet-point generator data sheet


Signal converter user guide Set-point generator user guide

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Millivolt Signal Conditioner /Bridge Amplifier

Accepts voltage signals from bridge type transducers (e.g. load cells) and other millivolt sources in the range 0-10mV to 0-100mV. The gain is user selectable. Optionally the unit can be calibrated for voltages from 0-1V to 0-10V. An isolated and stabilised transducer power supply is provided.

B12 Bridge amplifier




Bridge amplifier information Bridge amplifier data sheet


Bridge amplifier user guideBridge amplifier user guide


Loop-powered Trip Amplifier

The B12-2W single point trip amplifier provides voltage free contacts which change state when the input signal passes an adjustable reference set-point. No auxiliary supply is required as the trip amp derives all its power from the 4-20mA signal being monitored.

loop-powered trip amp




Loop-powered trip amp data Trip Amp data sheet


loop-powered trip-amp user guide Trip Amp user guide


Isolating Signal Conditioner

Designed to cater for the more demanding applications such as non-standard input and output signals, inverting, bidirectional and reverse acting signal conversions. Outputs are user configurable. Accessible span and zero adjustment, Wall or DIN rail mounting.

Isolating signal conditioner




Signal isolator/booster information Signal conditioner data sheet


Bridge amplifier user guideSignal conditioner user guide



Analogue to Frequency Converter

Product !

Converts a DC voltage or current (mA) input signal into pulses with respect to time. The output pulse rate is proportional to the magnitude of the input signal. Provides continuous integration of any analogue process signal varying with time ('rate' signal) e.g. flow, BTU, Watts. etc.

B12 Analogue to frequency converter




Analogue to frequency converter / integrator data Analogue to frequency converter data sheet(pdf)


Analogue to frequency user guideAnalogue to frequency user guide (pdf)

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Analogue Summator

Sums / subtracts up to three voltage or current input signals. The output signal may be current or voltage and will be proportional to the sum or difference of the input signals. This unit will perform an averaging function with equal input ranges. See 112-6A for number of inputs greater than three.

B12 Summator

2 Input Version



3 Input Version



Analogue summator / subtractor information Summator / subtractor data sheet


Indicating triple trip amplifier user guideSummator / subtractor user guide

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Root Extractor
Square root
3/2 Law
5/2 Law

Provides a voltage or current signal output which is proportional to one of the following functions:
• Square root of the input signal (e.g. for DP transmitter)
• 3/2 law (e.g. for flowrate measurements from flume or weir)
• 5/2 law (e.g. for flowrate measurements form 'V' Notch weir)
Input and output signals may be current or voltage and the unit will convert to signals of different ranges and types. The unit provides an optional transducer excitation supply.

B12 Root extractor

Root Extractor



3/2 Law



5/2 Law



Square root extractor information Root extractor data sheet


Square root extractor user guideRoot extractor user guide

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to Analogue

enhanced version !

Also see


Provides a mA or voltage output proportional to the frequency of the input signal. The B12-10C has many uses in applications including water and energy metering and rotational measurements.
Optional PC configuration software provides range changing and optimisation of digital filtering to suit site conditions.

  • Frequency ranges from 0 - 0.1Hz up to 0 - 5kHz
  • Programmable filtering and ranging via USB infrared link
  • Transducer power supply
  • User selectable inputs: open-collector, volt-free contact, current pulse (e.g. NAMUR 1-3mA pulse), and voltage pulse (10 mV p.t.p. to 250 V R.M.S - sine, square or triangular waveforms)
  • User configurable output ranges: V, mA sink or source
  • Wall or DIN rail mounting
B12 Frequency to Analogue converter
Standard unit - see data sheet



Pre-configured to order



Programming Kit



Frequency to analogue (frequency to current or voltage) current converter information Frequency to analogue data sheet


Frequency to analogue converter user guideFrequency to analogue installation guide

. Frequency to Analogue programming guide


Frequency to analogue converter programming software download download configuration software




Provides an analogue output signal proportional to the multiplication of two analogue input signals. The input signals may be of differing types e.g. current / voltage, true / raised zero, etc.
NB The multiplier can also be made to function as a squarer.

B12 Multiplier




Analogue multiplier / divider informationMultiplier data sheet


Multiplier user guideMultiplier user guide


Rate Limiter

A range of signal conditioners providing functions which control the rate of change in the output signal for a change in input signal. These units may also provide signal conversion. The time constant is adjustable by a front panel mounted dial. Times to FSD are calibrated to order and are typically available from 0-60s up to 0-120s.

B12 Rate limiter

Information on special signal converters providing rate limiting functions Rate limiter data sheet (for all versions)


Multiplier user guideRate limiter user guide (for all versions)


Slow Up Fast Down Response Unit: the response curve is an exponential and the time to steady state output is the same for any magnitude of change of a rising input signal. However for a negative going change in input signal, the output response is virtually instant.





Rate Limiter: the response curve is linear giving a ramp with a fixed rate of change. The effect on the output is a response time proportional to the magnitude of the input signal change.




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Slow up, Slow Down Response Unit: the reponse curve is similar to the B12-17 /0 but the rate of change is also controlled for negative going input signals




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Rate of Change

Provides an output signal, with magnitude proportional to the rate of change of the input signal. B12-1 signal conditioner for resistance and PRT inputs




Rate of change signal converter information Rate of change monitor data sheet


Rate of Change Monitor user guideRate of change monitor user guide



Signal Isolator /
Signal Splitter

enhanced versions of the B12-Si and

Also see
C16-3> Signal Splitter

  • Provides isolated signal repeater, signal conversion or signal splitter functions
  • Operates from either AC or DC supplies
  • User configurable input and output.
Signal isolator available in single and dual output versions

Single Output


Dual Output


B12 Isolator / signal / splitter/ booster / converter information signal isolator data sheet

Signal isolator user guidesignal isolator user guide


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Now Universal AC/DC powered:
85-260 VAC

Provides voltage free contacts which change state when the input signal passes an adjustable reference point. Single and dual point versions are available. A single pole change-over relay contact is provided for each set point. The dual version offers interlocked channel operation. Basic models provide low-cost options with set-point adjustment by multi-turn trim controls accessed through the front panel.

B12-DT/k trip amplifierB12 dual trip alarm

Single Point



Single Point with 10-turn dial



Dual Point



Dual Point with 10-turn dials



B12 single and dual trip amplifiers information single / dual trip amplifier data sheet


B12 single and dual trip amplifiers user guidesingle / dual trip amplifier user guide



Programmable Triple Trip Amplifier

The B12 three-point trip amplifier specification includes: universal mains power (85 to 265 VAC) or optional 24VDC (18-36VDC), Three set-points, Four digit display of monitored variable Programmable, trip points, input source and scale, delay, hysteresis, relay action, alarm type Monitored channel status indication Scaling 0-100%, voltage, mA or custom engineering units

Simple to use yet powerful menu-driven software enables fast flexible set-up from the front panel. No adjustment of internal potentiometers, internal links or plug-in cards is necessary. This versatile unit lends itself to numerous applications including detection of high/low alarm conditions and pump control.


Indicating programmable triple trip amplifier
These functions are also available in the 500-TT Process Display programmable process display with alarms More details here




Indicating triple trip amplifier informationtriple trip amplifier data sheet


Indicating triple trip amplifier user guidetriple trip amplifier user guide

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Signal Isolator

Provides cost-effective signal isolator, booster or signal converter functions, with the following features:
• Total isolation for 2 & 3 wire transmitters
• Field programmable input & output ranges
• 24 V transmitter / loop supply
• Universal 85-260 VAC powered.

The input, outputs and power supply are electrically isolated from each other making these units ideal for preventing or solving erratic measurements due to earth loops.

Transmitter isolator provides total isolation for 2 & 3 wire transmitters




B12 Isolator / signal / splitter/ booster / converter informationfield configurable signal isolator data sheet


B12 Isolator / signal / splitter/ booster / converter user guide field configurable signal isolator user guide