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Brand: SOR
SOR 6L Explosion-Proof Pressure Switch
Description
A piston-actuated explosion-proof pressure switch for process skids
The SOR 6L is an explosion-proof pressure switch in the SOR piston-actuated range, a rugged field-mounted instrument with a cast-iron housing. Its sensing element is a force-balance, piston-actuated assembly sealed by a flexible diaphragm and a static O-ring; for some services a metal diaphragm can be welded to the pressure port to eliminate the O-ring. The 6 designates the piston size, which together with the spring sets the adjustable range. The L housing is the conventional explosion-proof enclosure for hazardous locations, and the same piston sizes are also offered in the NN weatherproof aluminium housing.
Typical duties are pump and compressor shut-down, low lube-oil pressure alarms, and unloading or start-stop control on air, oil and water systems. SOR notes that basic models with standard wetted parts suit air, oil, water and non-corrosive processes; corrosive service needs optional diaphragm and port materials.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / catalog | SOR Inc. (SOR Controls Group), Pressure and Vacuum Switches, Form 216 |
| Model | 6L explosion-proof pressure switch (6NN weatherproof equivalent) |
| Housing | L: cast iron, conventional explosion proof, NEMA 4, 4X, 7, 9, IP66 (weatherproof with option CG); UL Listed Class I Groups C and D; Class II Groups E, F, G; Div. 1 and 2 as an outlet box only |
| Electrical connection | 3/4 in NPT(F) |
| Switching element (standard) | SPDT, K: 15 A at 250 VAC; other elements include low power gold contact, DC, wide and narrow dead band, 400 F hi-ambient, DPDT and manual reset |
| Piston 6 range, spring K2 | 7 to 30 psi increasing; typical dead band 0.5 psi |
| Piston 6 range, spring K3 | 12 to 100 psi; dead band 0.9 psi |
| Piston 6 range, spring K5 | 20 to 180 psi; dead band 1.4 psi |
| Piston 6 range, spring K45 | 25 to 275 psi; dead band 1.9 psi |
| Piston 6 overrange / proof pressure | 1,500 psi / 2,500 psi |
| Standard wetted parts | Diaphragm N4 (TCP) with Buna-N O-ring; pressure port G1A 303SS, 1/4 in NPT(F) |
| Catalog pressure span | 30 in Hg vacuum to 4,000 psi across the full product line |
| Certification | IEC 61508 (SIL) for non-redundant use in SIL1 and SIL2 for most models; select models with ATEX, IECEx, CSA, FM, INMETRO, TIIS and UL listings |
| Standard model example (catalog) | 6L-K2-N4-G1A, 6L-K3-N4-G1A, 6L-K5-N4-G1A, 6L-K45-N4-G1A |
Other explosion-proof ranges in the same catalog
| Parameter | Specification |
|---|---|
| 12L (piston 12) | 0.6 to 2.5 psi up to 1 to 16 psi; overrange 200 psi, proof 400 psi |
| 4L (piston 4) | 2 to 8 psi up to 4 to 75 psi; overrange 750 psi, proof 1,000 psi |
| 5L (piston 5) | 25 to 240 psi up to 45 to 550 psi; overrange 1,500 psi, proof 2,500 psi |
| 9L (piston 9) | 100 to 500 psi up to 200 to 1,750 psi; overrange 2,500 psi, proof 6,000 psi |
| 1L (piston 1) | 500 to 4,000 psi; overrange 5,000 psi, proof 6,000 psi |
| 52L, 54L, 56L (vacuum / compound) | Vacuum-0-pressure ranges from 30 in Hg to 160 in wc |
Setting the range and choosing the options
Set points rise with increasing pressure, so choose the spring so that the working set point falls in the middle of the adjustable range, where the typical dead band quoted applies. Dead band widens with the range, so the lowest range that covers the application gives the tightest reset. Confirm the process fluid against the diaphragm and port material, the electrical load against the switching element, the area classification against the listing needed, and any manual-reset or accessory requirement. A standard model number must carry a designator for every position except accessories.
Documents and quotation
The attached SOR pressure and vacuum switch catalog (Form 216) holds the quick-selection guide, element tables, diaphragm and port options and agency listings, and the general instructions (Form 496) cover installation and setting. Send the piston and range, element, diaphragm, port and approval for a quotation. See more pressure instrumentation.
Datasheets & Documents
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About brand
SOR, headquartered in Lenexa, Kansas, designs and manufactures electronic and mechanical instrumentation for measuring pressure, temperature, level and flow. The company dates its history to 1946 and describes itself as a DwyerOmega brand. Seven Star LLC is an independent supplier in Muscat and lists its differential pressure transmitters, pressure switches, level switches and flow switches.
Where SOR instruments are used
The company serves the process industries, with significant experience in oil and gas, petrochemical, chemical and power. Its catalogs cover piston-actuated pressure and vacuum switches, 800 Series and 1800 Series pressure transmitters, float-operated and ultrasonic level switches and vane-operated flow switches, many with hazardous-area approvals and IEC 61508 SIL certification for most models.
Ordering from the catalog
Most models are built from a quick-select model code that specifies housing, range, wetted materials, connection, switch element and accessories. Send the full code or the process data (fluid, pressure, temperature, connection and area classification) and we check the configuration against the SOR catalog before quoting. The 815DT, 1800DP, 1510, 1520, 2700 and 6L pages show how the codes are read.
Related products
Frequently Asked Questions
What does the 6 in SOR 6L refer to?
It is the piston size; the piston and spring together set the adjustable pressure range.
What ranges does the 6L cover?
With springs K2, K3, K5 and K45 the adjustable range runs from 7 to 30 psi up to 25 to 275 psi on increasing pressure.
What are the overrange and proof pressures?
The catalog gives 1,500 psi overrange and 2,500 psi proof pressure for piston 6.
What enclosure does the L housing have?
A cast-iron conventional explosion-proof housing rated NEMA 4, 4X, 7, 9 and IP66, listed UL Class I Groups C and D and Class II Groups E, F, G.
What fluids suit the standard model?
SOR states basic models with standard wetted parts suit air, oil, water and non-corrosive processes; corrosive service needs optional diaphragm and port materials.
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