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Engineering Selection Guide
Category overview
Pressure controllers in this catalogue are products that observe pressure and provide a switching or control-related output. The first question is functional: is the device only indicating an alarm, starting or stopping a pump, interlocking a machine, or participating in continuous regulation? Each task has different requirements for set points, hysteresis, response, output type and failure behaviour. Write the required action as a simple cause-and-effect statement before choosing pressure range or electrical connections.
For on/off duties, define how many set points are needed, whether each acts on rising or falling pressure, the required reset behaviour and acceptable dead band. Too little hysteresis can cause relay chatter in a noisy process; too much may allow an unwanted operating swing. Pressure cycling, pulsation and switch frequency affect mechanical and electrical life. The controlled load may need an interposing relay even when a device has a switch output, so state voltage, current, inductive characteristics and the receiving circuit.
Continuous pressure regulation is a system problem rather than a sensor feature. Process volume, valve or pump response, disturbances, sampling, delay and controller tuning determine stability. A pressure switch should not be described as a closed-loop controller unless the exact model and architecture support that function. Likewise, a configurable electronic set point does not make a device suitable for a safety-instrumented function. Safety integrity, independence, diagnostics and proof testing require a separately engineered and documented basis.
The published TYCK families below can be screened by pressure reference, range, number of outputs, signal, display, connection and enclosure. In an RFQ, include cause-and-effect logic, normal and upset pressures, set and reset points, cycling frequency, response need, supply and load details, fail state, environmental conditions and required approvals. Ask for wiring diagrams and exact output ratings for the selected code before it is connected to a contactor, PLC input or shutdown circuit.
Selection factors
- Control objective
- State alarm, pump start/stop, compressor staging, machine interlock or analogue regulation. Describe what must happen on rising pressure, falling pressure, sensor fault, loss of power and restored power.
- Set-point behaviour
- Provide set and reset values, required number of points, hysteresis or dead band, delay, latching and manual reset needs. Include process noise, pulsation and expected switching frequency.
- Electrical interface
- Define supply, relay or transistor output, analogue signal, load voltage and current, inductive load, PLC input characteristics, cable entry and grounding. Determine whether isolation or an interposing relay is required.
- Pressure and environment
- Give reference type, operating span, vacuum, transient and overload, process connection, medium, materials, vibration, temperature, enclosure and any approval or safety requirement needing exact evidence.
Typical applications
- Pump start and stop control where set points, hysteresis, cycling rate, dry-run logic and motor-control interface are engineered together.
- Compressor or packaged-machine interlocks with defined fail state, response, electrical load and manual reset behaviour.
- Process pressure alarms sent to a PLC or relay system, with local display or analogue monitoring when specifically configured.
Limitations and confirmation points
- A configurable switch is not automatically a safety device. Protective functions require a risk-based design, independence, proof-test procedure and certificates appropriate to the claimed role.
- Published contact ratings may depend on voltage, load type and switching frequency. Do not connect motors, solenoids or other inductive loads without checking the exact wiring and interface design.
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Frequently asked questions
How should hysteresis be specified?
Give both the action point and the desired reset point in engineering units, plus whether pressure is rising or falling. This removes ambiguity about adjustable hysteresis or dead band. The difference should be wide enough to avoid chatter from normal noise and pulsation but narrow enough for the process requirement. Confirm achievable settings and repeatability for the exact model rather than assuming any two displayed values are supported.
Can a pressure controller switch a pump motor directly?
That depends on the exact output rating and the motor-control architecture, and direct switching is often inappropriate. Motors and contactor coils can impose inrush or inductive stress. Provide the load voltage, current and type, then use an approved contactor, relay or PLC interface where required by the electrical design. The controller's wiring diagram and rating must match the chosen circuit and site rules.
What distinguishes an alarm from a safety trip?
An alarm informs an operator or control system; a safety trip is part of a risk-reduction function with defined integrity, independence, failure response and proof testing. A device may provide a reliable process alarm without being certified or engineered for a safety-instrumented function. The process hazard assessment determines the requirement, and the exact hardware, architecture and documentation must then be verified against it.