Danfoss 017-140866 RT 5 Pressure Switch 4-17 bar

Danfoss 017-140866 RT 5 pressure switch, 4 to 17 bar

The Danfoss 017-140866 is an RT 5, a mechanical pressure switch for the medium-pressure band from 4 to 17 bar g with an adjustable differential of 1.2 to 4 bar. It is built like the other RT switches around a bellows, a set spring and an SPDT snap contact in an IP66 housing, and this code is supplied with a weld nipple for a 6.5/10 mm tube. Its working pressure is 22 bar g and test pressure 25 bar g, so there is a comfortable margin above the 17 bar top of scale. Seven Star LLC supplies the 017-140866 in Oman and the GCC as an independent supplier in Muscat.

The manufacturer lists 017-525566 as the identical product on its product page.

017-140866 identification and options

017-140866 technical specifications

Choosing set point and differential

For a compressor or pump control the lower knob value is the cut-in pressure and the differential disc adds the pressure span before cut-out. A typical air system running between 6 and 8 bar needs a set point of 6 bar and a differential of 2 bar, comfortably inside the 1.2 to 4 bar differential range of the RT 5. Too small a differential causes short cycling and hunting; too large a differential gives large pressure swings. The manufacturer recommends fine-tuning the mechanical differential after the plant has run for a while, because the thermal and hydraulic response of the real system always adds to it.

The 017-140866 is supplied with a weld nipple for a 6.5/10 mm tube. If the tube connection will be disturbed often for service, a code with a cutting-ring connection (for example in the same RT 5 ordering table) may be easier to maintain.

Where the RT 5 fits in the RT range

The RT 5 covers 4 to 17 bar, overlapping the top of the RT 116 (1 to 10 bar, 017-140166) and the bottom of the RT 117 (10 to 30 bar). For a system with a normal operating pressure around 8 to 12 bar, either an RT 116 or an RT 5 can work, but the RT 5 keeps the set point in the middle of the scale for pressures from 8 to 14 bar. For fail-safe functions, the RT 6 and RT 30 families have double bellows and EN 12263 approval, which the RT 5 does not.

Selection and ordering checklist for RT 5

• Cut-in and cut-out pressures within 4 to 17 bar and the differential between them.
• Highest system or relief pressure, kept below 22 bar g working and 25 bar g test.
• Connection type: weld nipple on this code, or other code numbers with G 3/8 male only or a cutting ring.
• Medium and temperature; the general media window in the data sheet is -50 to 100 °C, and steam needs a water-filled loop.
• Electrical load against contact ratings.
• Class approvals; this code lists BV, GL, KR, LR, NKK and RINA among others.

Installation and maintenance

Fit the switch to a rigid panel or bracket using the two fixing holes under the cover, and keep the cable entries facing downwards on vibrating plant. On steam, insert a water-filled loop; on cold-water lines where frost is possible, let the switch operate on an air cushion to avoid bursting a water-filled element. Pulsating lines need a damping coil. Replace the contact system or the complete switch if the contact has been overloaded; the contact sets are separate parts in the accessories list.

Applications of the 017-140866 in Oman and the GCC

Instrument and service air receivers, cooling-water and chilled-water circuits, boiler feed and fuel-oil systems, refrigeration high-pressure sides and fire-water jockey pump control are the typical applications. In Oman the RT 5 is often seen on marine and offshore utility skids because of its class approvals, and on onshore skids where a robust switch without electronics is preferred in dusty, hot, humid conditions.

Information to send with an RFQ for 017-140866

• Code 017-140866 and quantity.
• Required cut-in and cut-out pressures.
• Medium, temperature and pulsation.
• Connection style and weld nipple requirement.
• Electrical load, voltage and approvals.

Site conditions in Oman for the 017-140866

Field instruments in Oman are exposed to strong sun, high ambient temperature, wind-blown dust and, on coastal plants, salt in the air. When you specify the 017-140866, check the ambient and process temperature limits, the enclosure rating and the wetted and housing materials against the actual installation point, and consider sunshades for transmitters mounted in direct sunlight. Cable entries should be sealed with suitable glands so that dust and moisture cannot enter the housing.

Calibration and verification planning matters as much as selection. Record the range, configuration and tag data of each 017-140866 at commissioning, define a check interval that suits the criticality of the loop, and keep the certificates with the plant documentation so that audits and shutdown work can proceed without delay.

Documents and quotation

The Danfoss RT pressure switch data sheet is attached on this page, with ordering tables, material list and setting notes.

Send the code 017-140866 and your set points and we will confirm availability and a quotation for Oman and the GCC.