Trip amplifiers
Trip amplifiers, otherwise known as trip amps, high-low limit alarm trips, alarm relays, alarm trips, or threshold relays, provide voltage free contacts that change state when a monitored process signal passes an adjustable reference set-point. Trip amps can be applied to numerous applications including detection of high or low limit alarm conditions and duty/standby pump control.
Typical trip amplifier applications
- Limit alarm for detection of High and Low alarm conditions
- With an input from a level sensor; provide pump control to maintain a level between the high and low set points (dual version with interlock function enabled).
- With an input from a flow sensor and cycling on-off timer, control the position of a penstock or motorised valve to maintain a fixed flow rate.
- With an input from a temperature or pressure transducer; start a process at one set point, with shut down if the high point is reached (dual trip version).
- With an input signal from a pH monitor; provide control of a dosing pump.
- Replacement for vane type switches.
Quick links
Single channel trip amplifiers (one set-point)
See trip amplifier selection guide...
B12-ST Trip amplifier
A low-cost trip-amp with a single pole change-over relay. The multi-turn set-point control is adjusted, through front panel, by screwdriver. Wall or DIN rail mounting.
Set-up on-site with the CAL-2 current-loop and voltage calibrator
B12-ST/k Trip amplifier
As above but the set-point is adjusted by a multi-turn precision dial scaled 0-100%. DIN rail mounting.
COM-2 Trip amplifier
24VDC powered DIN rail mounting trip-amp with a single pole change-over relay. User selectable input ranges.
Check set-points with the CAL-2 current-loop and voltage calibrator
112-2-1 Trip amplifier
The set-point is adjusted by a multi-turn precision dial scaled 0-100%. Two change-over relay contacts are provided. Wall or DIN rail mounting.
Loop powered trip amplifiers (one set point)
See trip amplifier selection guide...
B12-2W Loop-powered trip amplifier
Requires no external supply but derives its power from the 4-20mA input signal. A normally open contact and a normally closed contact are provided. Multi-turn precision dial set-point scaled 0-100%. Wall or DIN rail mounting.
107-2/2W Loop-powered trip amplifier
Function as B12-1 above
NB Available for spares and replacements for existing applications. For new projects please refer to the B12 range of products. A 107 to B12 cross-reference is here >
Dual channel trip amplifiers (two set-points)
See trip amplifier selection guide...
B12-DT Dual trip amplifier
A low-cost trip-amp with a single pole change-over relay is provided for each set point. This unit offers interlocked channel operation. The multi-turn set-point control is adjusted, through front panel, by screwdriver. Wall or DIN rail mounting.
Set-up on-site with the CAL-2 current-loop and voltage calibrator
B12-DT/k Dual trip amplifier
As above but the set-points are set by multi-turn precision dials scaled 0-100%. Wall or DIN rail mounting.
Set-points are adjusted by multi-turn precision dials scaled 0-100%. Interlock / latched function. Dual input capability. Change-over plus SP relay contacts per channel. Wall or DIN rail mounting.
D16-T Universal input dual trip amplifier
Accepts Thermocouple, RTD, mA and mV inputs. Set-points are adjusted by PC software via USB link. DIN rail mounting.
Triple channel trip amplifiers (three set-points)
See trip amplifier selection guide...
B12-TT Indicating trip amplifier (3-point programmable)
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. Wall or DIN rail mounting.
Other instruments with trip / alarm functions
in our range include:-
Digital panel meters
See Process display (programmable with alarms)...
See Universal input panel meters...
Universal input data aquisition modules
See
Tracker 331 / 332...
Accessories...
Signal source for on-site testing and re-calibration
See the Current loop and voltage calibrator…
