The KOBOLD PSD Digital Pressure Sensor is a compact pressure switch and transmitter with an integrated LED display that measures and monitors pressure across ranges from 0–30 up to 0–7500 PSI. Built on a thin-film measuring cell, it combines two PNP switching outputs with a scalable analog output, configurable as 4–20 mA or 0–10 VDC, so a single device provides both switching and continuous measurement. Switch points, reset points, output functions, and display units are all set on the device using three buttons. The 4-digit LED display and the electrical connection rotate independently, and the display can be flipped 180°. Accuracy is ±0.5% FS at 77°F, and the sensor carries an IP65 rating with stainless-steel wetted components.
Measuring Ranges and Accuracy
The PSD is offered in pressure ranges from 0–30 PSI up to 0–7500 PSI, each adjustable between 50% and 100% of its nominal full scale. Accuracy is ±0.5% FS at 77°F, with a total error band of ±1.75% FS across the full −13 to 185°F range for the analog output.
- Measuring principle: thin film
- Display resolution: 0.1% FS; display range −3 to 103% FS
- Selectable display units: psi, bar, MPa, kPa, m WC, mm WC
- Long-term stability (1 year): ±0.1% FS (analog)
Outputs and Switching Functions
The PSD provides a switchable analog output (4–20 mA or 0–10 VDC) plus two PNP transistor switching outputs. Each switching output can be set as normally open or normally closed and can operate in hysteresis or window mode, with an adjustable delay of 0 to 99.99 seconds. Switch points are adjustable across 0–100% FS with ≥1% FS hysteresis.
- Switching current: ≤0.5 A per output (current limiting ≤2 A per output)
- Switching frequency: max. 200 Hz
- Switching resistance: ≤3 Ω
Display and Programming
The PSD uses a 4-digit, 7-segment red LED display with two status LEDs for the switching outputs. All parameters are set with three buttons using menu navigation per VDMA 24574-1. The display and the electrical connection rotate independently, 335° and 343°, respectively, and the display can be flipped 180° or disabled.
Because the display and connection rotate independently, the PSD is designed to remain readable across a range of mounting orientations.
Construction and Materials
The PSD's sensor and pressure-connection wetted parts are stainless steel (1.4542 / AISI 630). The housing is galvanized die-cast metal with a plastic display housing, rated IP65. The process connection is 1/4″ NPT male, and the unit weighs approximately 6.7 oz (189 g). It is specified to withstand vibration to 10 g (10–2000 Hz) and shock to 50 g / 3 ms.
Installation and Electrical Connection
The PSD threads into a 1/4″ NPT port and should be tightened only at the wrench flats to approximately 11–15 ft-lb (15–20 Nm). The electrical connection is via a 5-pin M12 plug carrying the 24 VDC supply, the analog output, and both switching outputs; a shielded cable is recommended.
Applications
Applications for the PSD include machine tools, hydraulics, process technology, and general industrial use, and it is offered as an OEM-targeted product with quantity pricing available. It can be used to monitor the pressure of media compatible with its stainless-steel wetted parts, including liquids, air, and other non-combustible, non-aggressive gases. By providing two switching outputs and a scalable analog output together, the PSD is designed to consolidate switching and continuous measurement into a single instrument.
Common Questions about PSD - Digital Pressure Sensor with LED Display, Switch & Analog Outputs
The PSD is a compact digital pressure sensor that combines a pressure switch, a transmitter, and an LED display in one device. It offers two PNP switching outputs plus a configurable 4–20 mA or 0–10 VDC analog output, with parameters set on the device using three buttons.
The PSD is available in ranges from 0–30 PSI up to 0–7500 PSI. Each range is adjustable between 50% and 100% of its nominal full scale, so a single unit can be scaled to the pressure span of a given application within its range.
Accuracy is ±0.5% FS at 77°F. Across the full −13 to 185°F range, the analog output carries a total error band of ±1.75% FS, and long-term stability over one year is ±0.1% FS.
The PSD has one analog output, switchable between 4–20 mA and 0–10 VDC, plus two independent PNP transistor switching outputs. This lets a single device deliver a continuous measurement signal and two switching signals at the same time.
Each of the two switching outputs can be configured as normally open or normally closed and can run in hysteresis or window mode. An adjustable delay of 0 to 99.99 seconds is available per output, and switch points are adjustable across 0–100% FS with ≥1% FS hysteresis.
Both media and ambient temperature ranges are −13 to 185°F (−25 to 85°C). Maximum humidity is 95% relative, and the unit is specified for vibration to 10 g and shock to 50 g / 3 ms.
Yes, within its rated limits. Each PSD range is rated for an overpressure of 3x the nominal full scale (2.5x on the 0–5000 and 0–7500 PSI ranges) and a higher burst pressure that varies by range. A surge-damping orifice option (Ø 0.4 mm) is available for applications with rapid pressure transients.
The PSD threads into a 1/4″ NPT port and is tightened at the wrench flats to about 11–15 ft-lb (15–20 Nm). Its power supply requirement is 24 VDC supplied through a 5-pin M12 plug that also carries the analog and both switching outputs; a shielded cable is recommended and is ordered separately.
The PSD has a 4-digit, 7-segment red LED display with two switching-status LEDs. Three buttons set all parameters using VDMA 24574-1 menu navigation. The display and electrical connection rotate independently (335° / 343°), and the display can be flipped 180° or disabled.
The sensor and pressure-connection wetted parts are stainless steel (1.4542 / AISI 630). The housing is galvanized die-cast metal with a plastic display, and the unit is rated IP65. The process connection is 1/4″ NPT male. The unit weighs approximately 6.7 oz (189 g).
Applications include machine tools, hydraulics, process technology, and general industrial use, and it is offered as an OEM-targeted product. It is designed to monitor media compatible with its stainless-steel wetted parts, including compatible liquids, air, and non-combustible, non-aggressive gases.
Product Specifications
Measuring Ranges
0...30 to 0...7500 PSI
Accuracy
± 0.5 % FS @ 77 °F
Media and Ambient Temperature Range
-13...185 °F (85 °C)
Media
Compatible Liquids & Non-combustible/Non-aggressive Gases
Product Features
Analog Output, Switchable 4-20 mA or 0-10 V
Switching Output with 2 PNP Transistors
Adjustable Pressure Range from 50…100 % of the Nominal Range
Display and Electrical Connection are Independently Rotatable 335°/343°
Sample Applications: Machine Tools, Hydraulics, Process Technology, and General Industrial Use
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