Danfoss 078G1000 DST P92S Pressure Transmitter 0-40 bar SIL 2

DST P92S: a dual-output safety transmitter for mobile and industrial hydraulics

Danfoss 078G1000 is the 0 to 40 bar member of the DST P92S line. The data sheet describes the P92S as an OEM transmitter for mobile and industrial hydraulics, suitable for a functional safety environment requiring PLd to EN ISO 13849-1, AgPLd to EN ISO 25119 or SIL 2 to IEC 61508, and notes that Danfoss holds a third-party TUV approval to ease use in a safety system.

Its distinctive feature is the dual output: one channel rises from 4 to 20 mA while the second falls from 20 to 4 mA, so the safety controller can compare the two channels and detect a fault. Cyclic and start-up diagnostics are built in.

Technical specifications

Using a dual-channel signal

The two channels are meant to be read by a safety-rated input, which checks that their sum stays within the expected window. Standard PLC cards that read only one channel will work but will not give the safety benefit. The family offers ranges from 0-10 to 0-1200 bar, and the 40 bar code is one of seven standard ranges listed with G 1/4 and M12.

Burst pressure is 400 bar and overload 80 bar, so line peaks of up to twice the range are tolerated. Start-up takes 40 ms and the response time is 1 ms, which supports fast hydraulic control loops on presses and mobile machines.

Engineering and ordering notes

The accuracy figures depend on the temperature band: 1 % between 0 and 80 C, and wider limits down to -40 C. The M12 five-pin connector requires a matching cable. Check whether your machine safety case needs the exact certificate, rather than relying on the family description.

Seven Star LLC is an independent supplier in Muscat; send 078G1000 with the quantity and the safety level needed.

For a machine builder, the safety case does not end with the sensor: the input module, the wiring, the diagnostics coverage and the proof-test interval all contribute to the achieved performance level. Danfoss supplies the sensor data, and your system integrator must combine it with the rest of the safety function. Keep the data sheet revision with the machine documentation.

For repeat purchases of 078G1000, tell us the quantity you expect to use each year and the delivery point in Oman. That helps us to plan the enquiry with the manufacturer channel and to give you a realistic lead time, which we confirm only when we quote.

We prefer to confirm the application before quoting 078G1000: the medium or load, the supply or pressure, the ambient temperature and the standards that apply. A short message with these points avoids the wrong variant being ordered and keeps the project schedule safe.

Applications for a dual-output safety transmitter

The DST P92S is aimed at hydraulic systems where pressure is part of a safety function. Typical examples in mobile hydraulics are load-holding and overload monitoring on cranes, aerial work platforms, telehandlers and agricultural machines, where a pressure reading feeds the load moment or stability calculation. In industrial hydraulics, presses, clamping systems, test benches and hydraulic power units use pressure transmitters to confirm that clamping force is present or that pressure stays within safe limits before motion is allowed. The 0 to 40 bar range of this code suits pilot, clamping and lower-pressure circuits rather than main high-pressure lines.

Selection and integration with the safety controller

The main selection question is whether the safety controller can read and compare both output channels. A safety PLC or safety controller with two analogue inputs can check that the rising and falling signals agree, and treat any mismatch as a fault. If the machine uses a standard controller with only one input available, the transmitter will still measure pressure, but the safety benefit of the second channel is lost and the required performance level may not be reached.

Choose the pressure range so that normal operating pressure sits comfortably within the scale, and check that expected pressure peaks stay inside the overload rating on this page. Confirm that the accuracy band for your operating temperature is acceptable for the control function, since the band widens at low temperature.

Installation practice

Mount the transmitter at a point that represents the pressure to be monitored, away from positions directly after valves where pressure spikes are strongest. Tighten the G 1/4 connection to the hydraulic fitting practice used on the machine, and bleed air from the line during commissioning. Use a screened M12 cable, route it away from solenoid and motor power wiring, and secure it so it does not chafe on moving parts of the machine. Record the installed position and wiring in the safety documentation so that a later replacement is fitted the same way.

Operating conditions in Oman and the GCC

Mobile machines and hydraulic units in Oman work in high ambient temperatures, direct sun and dust. The IP67 enclosure and the stated medium temperature range cover typical hydraulic oil conditions, but direct sunlight on a machine can raise the transmitter body temperature well above the air temperature, so shade or position the sensor where practical. Keep the M12 connection fully tightened to prevent dust and moisture entry, and include the transmitter in the proof-test routine defined for the safety function.

During commissioning, compare both output channels against a reference gauge at several pressures across the range, and confirm that the safety controller reacts correctly when one channel is disconnected. Keeping these results with the machine file supports later inspections and proof tests.

Documents and quotation

The attached Danfoss DST P92S data sheet AI569728606482 contains the code table and diagnostics description. Related items sit in pressure instrumentation.