Danfoss 017-142666 RT 19W Pressure Switch 5-25 bar

RT 19W covers 5 to 25 bar with a 42 bar working pressure rating

Danfoss 017-142666 is the RT 19W, the higher-pressure pressure switch of the RT range. Its 5 to 25 bar window suits compressor discharge, hydraulic pilot circuits, steam-side feed and similar duties, and the housing carries a 42 bar maximum working pressure with a 47 bar test pressure. That combination means the set point can be selected comfortably within the range while the bellows still tolerates the transients that occur when valves close.

The W in the type name denotes the automatic-reset construction, so the SPDT contact returns by itself when the pressure has dropped by the differential of 1.2 bar. Manual-reset siblings are the RT 19B and RT 19S, which have a tighter 1.0 bar differential and other code numbers.

Technical specifications

Selection against RT 116 and RT 5

The RT series offers neighbouring ranges: RT 116 covers 1 to 10 bar and RT 5 covers 4 to 17 bar, so pick the type whose range puts your set point in the middle third of the scale. For 18 to 25 bar duty the RT 19W is the right step, and the higher PS ensures a safe margin above set point. If the line can see pulsation, such as a reciprocating pump, a snubber or needle valve should be fitted at the connection.

The printed approval list for this code contains CE, EAC, GL, PED, RoHS and UA. Marine class approvals differ between RT types, so if a class certificate is required confirm that the specific code is covered before ordering.

Installation details

The G 1/2 male thread needs a flat washer or bonded seal and should be tightened with a spanner on the flats. Mount the switch on the lugs, not on the pipe, to stay clear of vibration. Contacts are changed over by the lever mechanism; check the wiring terminals according to the installation guide for the RT 19W, RT 19B, RT 19S, RT 30A and RT 31 types before energising.

Seven Star LLC is an independent supplier in Muscat; please state the setting you need and the voltage on the contact when requesting a quotation for 017-142666.

When you receive 017-142666, compare the code on the label with the order and with this page before installation. Report any difference immediately, keep the original packing for the first days, and store the unit dry and clean until the installation crew is ready to start.

Projects that use 017-142666 often need related parts from the same manufacturer, such as connectors, mounting parts or spare kits. Mention them in the same enquiry so that compatibility can be checked together rather than discovered on site, when a missing part stops the work.

Setting and commissioning the RT 19W

Decide first which pressure should switch the contact and in which direction. With automatic reset and a 1.2 bar differential, the contact changes at the set point and returns once pressure has fallen by that differential, so the two values the process actually sees are the set point and the set point minus 1.2 bar. Write both on the loop sheet so that operators know where the compressor, pump or alarm will cut in and cut out.

Adjust the setting following the Danfoss installation guide, then confirm it against a calibrated test gauge rather than relying on the scale alone. A simple bench or in-line test, raising pressure slowly through the set point and lowering it again, shows both switching points. Check the SPDT contact action with a continuity tester before connecting the controlled circuit, and make sure the load on the contact stays within the AC and DC ratings listed above.

Wiring and cable entries

Bring the cables through the two Pg 13.5 screwed entries using glands that suit the cable diameter, so that the IP66 enclosure keeps its rating. Unused entries should remain closed. Route the cable with a drip loop below the switch so water running down the cable falls away before reaching the entry. Earth the unit as described in the installation guide and label the circuit so maintenance staff can isolate it before opening the cover.

Service in Oman plant rooms and outdoor skids

Compressor rooms, pump houses and outdoor hydraulic skids in the Gulf combine high ambient temperature with dust and, near the coast, salt-laden humidity. The stated ambient range of -50 to 70 C covers most locations, but direct sun on a metal enclosure can push its surface temperature well above the air temperature, so a shaded position on the frame is preferable. Avoid mounting the switch directly above hot discharge lines where rising heat collects.

Fine sand can enter through a lid left loose after adjustment. After every setting change, check that the cover is fully closed and that the cable glands are still tight. On compressor discharge duty, keep the sensing line short and protected from mechanical damage, and consider the snubber or needle valve mentioned above where pulsation is present.

Periodic checks

Include the RT 19W in the plant's routine instrument calibration rounds. Compare the actual switching point with the recorded setting, look for corrosion on the G 1/2 connection, and confirm that the mounting lugs are still secure. If the switching point has drifted or the switch does not reset when pressure drops by the differential, isolate the pressure line, vent it safely and investigate before returning the switch to service. Keep a copy of the attached data sheet and the setting record with the equipment file.

Documents and quotation

The Danfoss RT industrial pressure switch data sheet AI555514425055 is attached unaltered. More controls are listed in pressure instrumentation.