Clark Solutions

12 Series: Pressure, Differential Pressure & Temperature Switches

Explosion Proof, Adjustable Ranges 30" Vac to 6000 PSI, -130 to 650°F

Description

12 Series switches are ideal for operation in harsh explosive environments where space is at a premium. A snap-action Belleville spring assembly is used to provide vibration resistance and prolonged switch life. A hermetically sealed switch and stainless steel enclosure provide ruggedness and protection from the environment. The 12 Series is approved for use in hazardous locations worldwide, from offshore oil rigs to process and energy applications, to protection of capital equipment.

Triple approval (UL, cUL and ATEX) means the 12 Series meets the demanding requirements of hazardous locations. It can be used in a wide variety of applications where space is at a premium. Ambient temperatures can be as low as -58°F (-50°C) or as high as 203°F (95°C). All metal wetted parts comply with NACE MR-0175. The stainless steel design and enclosure type 4X rating assure long-term performance in the toughest applications.

FEATURES

  • Compact stainless steel construction
  • Convenient field setting and adjustment
  • UL, cUL and ATEX approved for Div. 1 or Zone 1 hazardous locations
  • SPDT or DPDT hermetically sealed switches
  • Snap-acting Belleville spring for long life, vibration resistance and stability
  • Mounting bracket available for retrofit applications
  • 3 year warranty
  • 72" leadwires with strain relief

SPECIFICATIONS
GENERAL

STORAGE TEMPERATURE:  -58° to 203°F (-50 to 95°C)
OPERATING AMBIENT TEMPERATURE: -58 to 203°F (-50 to 95°C). Set point shifts 
less than 1% of range for a 50°F (28°C) ambient temperature change. Slight 
ambient effects for 25-50' extra capillary length on temperature switch models, 
consult factory.
MEDIA TEMPERATURE:
	Pressure models:
		Sensor types 2, 7, 9: -50 to 400°F (-45 to 204°C)
		Sensor types 3, 4, 8: -20 to 200°F (-28 to 93°C)
		Sensor types 5, 6: 0 to 320°F (-18 to 160°C)
		Sensor type P: 0 to 200°F (-18 to 93°C), 20 to 250°F (-7 to 121°C) 
			for optional Viton sensor. 
	Differential pressure models:
		Sensor type K: 0 to 180°F (-18 to 82°C), 20 to 250°F (-7 to 121°C) 
			for optional Viton sensor
	Temperature models: See model chart.
SET POINT REPEATABILITY:
	Temperature models: ±1% of adjustable range
	Pressure models:
		Sensor types 2, P: ±1.5% of adjustable range
		Sensor types 3-9: ±1% of adjustable range
	Differential pressure models:
		K1 to K3: ±1%
		K4 to K6: ±1.5% of adjustable range
SHOCK:
	Differential pressure and temperature models: set point repeats after 15 G's, 
	10 millisecond duration
	Pressure models: Set point repeats after 75 G's, 10 milliseconds
VIBRATION:
	Differential pressure and temperature models: Set point repeats after 2.5 G's, 10-2000 Hz
	Pressure models: Set point repeats after 15 G's, 10-2000 Hz
ENCLOSURE: 300 series stainless steel
ENCLOSURE CLASSIFICATION:  Certified to Enclosure Type 4X
	Class I, Division 1 product meets enclosure Type 7
	Class II, Division I product meets enclosure type 9
	Certified to IP66 requirements
SWITCH OUTPUT:
	Code S: One SPDT, hermetically sealed
	Code D: Two SPDT for DPDT action, hermetically sealed
ELECTRICAL RATINGS: Code H: 5 A at 250 VAC, 5 A resistive and 3 A inductive at 28 VDC. 
Silver contacts, Code L: 1 A at 125 VAC, 1 A resistive and 0.5 A inductive at 28
	VDC, Bifurcated gold contacts
ELECTRICAL CONNECTION:
	Code N: 1/2" NPT (male) with 72" leadwires
	Code M: M20 metric threads, 72" leads
	Option M515, 4 terminal DIN connector (DIN 43650 Form A) available SPDT only
WEIGHT:
	Temperature models: approximately 1 lb 14 oz. (0,85 kg)
	Pressure models: approximately 12 ounces (0,34 kg)
	Differential models: approximately 3 lb (1,4 kg)
TEMPERATURE ASSEMBLY: Non-toxic oil fill; 6 feet 304 stainless steel. Optional lengths available
TEMPERATURE DEADBAND: Typically 2% of range under laboratory conditions (70°F ambient 
circulating  bath at a rate of 1/2°F per minute change)
PRESSURE CONNECTION: 1/2" NPT (female) or 1/4" NPT (female)
	Option M511: 1/4" NPT (male)
	Differential pressure: 1/8" NPT (female)
	Piston models: 1/4" NPT (female)
MOUNTING:
	Pressure: May be pipe mounted or bracket mounted using kit 62169-13
	Differential Pressure: Should be mounted using 2 mounting holes on sensor bracket
	
Approvals:
Class I, Division 1 and 2, Groups A, B, C & D
Class II, Division 1 and 2, Groups E, F & G
Class III
Class I, Zone 1, Group IIC
Enclosure Type 4X

UL Listed, cUL Certified
Pressure: UL 508 & 698; CSA C22.2 No. 14, 25 & 30
File # E40857
Temperature: UL 873, 1203;
CSA C22.2 No. 24, 25 & 30 - File # E43374

ATEX Directive (94/9/EC)
II 2 G EEx d IIC T6
II 2 D T+85°C
Tamb = -50°C to +80°C
IP 66
UL International DEMKO A/S (N.B.# 0539)
Certificate # DEMKO 03 ATEX 0252466X
EN 50014, 50018, 50281-1-1 & 60529

TECHNOLOGY

At the heart of the 12 Series is a Belleville spring assembly. The spring is a small conical washer that transfers motion to a hermetically sealed 1 or 5 amp microswitch. Its "snap-action" provides fast, positive contact transfer. The Belleville spring snaps over when pressure is applied and snaps back upon pressure release.

ADVANTAGES:

  • Set point stability: The switch performs under challenging environmental conditions such as vibration and temperature changes. In addition, minimal movement of components reduces sensor fatigue thereby increasing life and accuracy.
  • High over-pressures: The Belleville spring mechanism limits over-travel, thus extending pressure limits.
  • Resistance to vibration: Preloading of the electrical switch helps reduce contact chatter.
  • Maximum life: The Belleville spring enhances cycle life with a short stroke movement to minimize fatigue.
  • Small size: Belleville springs are simple in appearance, but can deliver a heavy load with a relatively small deflection, contributing to an overall compact product envelope.
  • Deadbands: The Belleville is a negative-rate snap acting device, so on-off deadband values are wider at the low end of the range. To minimize deadbands, select a model with a set point at the higher end of the range whenever possible.

12 SERIES MODEL CHARTS

Sensor Type 2, 316 stainless steel 1/2" NPT (female) pressure connection and welded diaphragm, 23/32" orifice for clean out purposes.
Range Code Adjustable Range
Lower end of range on fall;
Higher end on rise		 Deadband Over Range Pressure Proof Pressure
psi bar psi bar psi bar psi bar
A 10 to 25 0.7 to 1.7 0.1 to 0.5 0.1 to 0.5 1000 68.9 2500 172.4
B 15 to 45 1.0 to 3.1 0.2 to 0.7 0.2 to 0.7 1000 68.9 2500 172.4
C 25 to 85 1.7 to 5.9 0.3 to 1.4 0.3 to 1.4 1000 68.9 2500 172.4
D 50 to 130 3.4 to 9.0 0.5 to 1.7 0.5 to 1.7 1500 103.4 2500 172.4
E 100 to 210 6.9 to 14.5 0.6 to 2.1 0.6 to 2.1 1500 103.4 2500 172.4
F 160 to 400 11.0 to 27.6 0.7 to 3.4 0.7 to 3.4 1500 103.4 2500 172.4
G 275 to 850 19.0 to 58.6 2.8 to 8.6 2.8 to 8.6 1500 103.4 2500 172.4

Sensor Type 4, 316L stainless steel 1/4" NPT (female) pressure connection, Teflon® coated Polyimide (Kapton®) diaphragm, Buna N O-ring,1/8" orifice.
Sensor Type 3, 316L stainless steel 1/2" NPT (female) pressure connection, Teflon® coated Polyimide(Kapton®) diaphragm, Buna N O-ring, 1/2” orifice for clean-out purposes.
Range Code Adjustable Range
Lower end of range on fall;
Higher end on rise		 Deadband Over Range Pressure Proof Pressure
psi bar psi bar psi bar psi bar
A 8 to 30 0.6 to 2.1 2 to 6 0.1 to 0.4 600 41.4 1000 68.9
B 15 to 55 1.0 to 3.8 3 to 8 0.2 to 0.6 600 41.4 1000 68.9
C 30 to 170 2.1 to 11.7 5 to 15 0.3 to 1.0 600 41.4 1000 68.9
D 100 to 370 6.9 to 25.5 15 to 50 1.0 to 3.4 600 41.4 1000 68.9
E 200 to 700 13.8 to 48.3 40 to 90 2.8 to 6.2 1500 103.4 3000 206.8
F 400 to 1500 27.6 to 103.4 100 to 250 6.9 to 17.2 3000 206.8 4500 310.3
G 1000 to 3200 68.9 to 220.6 100 to 500 6.9 to 34.5 6000 413.7 10000 689.5
H 2000 to 6000 137.9 to 413.7 400 to 800 27.6 to 55.2 8000 551.6 10000 689.5

Sensor Type 5, 316L stainless steel 1/2" NPT (female) 1/2" pressure connection and diaphragm, Viton® O-ring, 1/2" orifice for clean out purposes.
Sensor Type 6, 316L stainless steel 1/4" NPT (female) pressure connection and diaphragm, Viton® O-ring, 1/8" orifice.
Range Code Adjustable Range
Lower end of range on fall;
Higher end on rise		 Deadband Over Range Pressure Proof Pressure
psi bar psi bar psi bar psi bar
A 9 to 35 0.6 to 2.4 2 to 7 0.1 to 0.5 600 41.4 1000 68.9
B 25 to 65 1.7 to 4.5 3 to 10 0.2 to 0.7 600 41.4 1000 68.9
C 50 to 150 3.4 to 10.3 5 to 15 0.3 to 1.0 600 41.4 1000 68.9
D 100 to 350 6.9 to 24.1 15 to 50 1.0 to 3.4 600 41.4 1000 68.9
E 250 to 700 17.2 to 48.3 40 to 95 2.8 to 6.6 1500 103.4 3000 206.8
F 400 to 1500 27.6 to 103.4 100 to 300 6.9 to 20.7 3000 206.8 4500 310.3
G 1000 to 3200 68.9 to 220.6 100 to 500 6.9 to 34.5 6000 413.7 10000 689.5
H 2000 to 6000 137.9 to 413.7 400 to 1000 27.6 to 68.9 8000 551.6 10000 689.5

Sensor Type 7, 316L stainless steel 1/2" NPT (female) pressure connection and welded diaphragm. Large 23/32" orifice for clean out purposes.
Range Code Adjustable Range
Lower end of range on fall;
Higher end on rise		 Deadband Over Range Pressure Proof Pressure
psi bar psi bar psi bar psi bar
A 3 to 15 0.2 to 1.0 1 to 4 0.1 to 0.3 300 20.7 500 34.5
B 10 to 35 0.7 to 2.4 1 to 6 0.1 to 0.4 300 20.7 500 34.5
C 25 to 85 1.7 to 5.9 3 to 11 0.2 to 0.8 300 20.7 500 34.5
D 65 to 125 4.5 to 8.6 6 to 18 0.4 to 1.2 300 20.7 500 34.5

Sensor Type 8, 316L stainless steel 1/4" NPT (female) pressure connection, Teflon® coated Polyimide (Kapton®) diaphragm, Buna N O-ring, 1/8" orifice. Non-Belleville actuation.
Range Code Adjustable Range
Lower end of range on fall;
Higher end on rise		 Deadband Over Range Pressure Proof Pressure
psi bar psi bar
(unless noted)		 psi bar psi bar
A 2 to 25 0.14 to 1.7 0.5 to 4 34.5 mbar to 0.3 bar 600 41.4 1000 68.9
B 15 to 75 1.0 to 5.2 1 to 7 0.1 to 0.5 600 41.4 1000 68.9
C 25 to 150 1.7 to 10.3 1 to 12 0.1 to 0.8 600 41.4 1000 68.9
D 50 to 450 3.4 to 31.0 3 to 28 0.2 to 1.9 2000 137.9 3000 206.8
E 100 to 900 6.9 to 62.1 10 to 60 0.7 to 4.1 2000 137.9 3000 206.8
F 500 to 2500 34.5 to 172.4 20 to 140 1.4 to 9.7 6000 413.7 7500 517.1
G 700 to 4000 48.3 to 275.8 40 to 250 2.8 to 17.2 6000 413.7 7500 517.1

Sensor Type 9, 316L stainless steel 1/2" NPT (female) pressure connection and welded diaphragm. Large 23/32" orifice for clean-out purposes.Non-Belleville actuation.
Range Code Adjustable Range
Lower end of range on fall;
Higher end on rise		 Deadband Over Range Pressure Proof Pressure
psi bar psi bar psi bar psi bar
A 1 to 15 0.1 to 1.0 0.5 to 2 34.5 to 137.9 300 20.7 500 34.5
B 3 to 50 0.2 to 3.4 0.5 to 4 34.5 to 275.8 300 20.7 500 34.5
C 5 to 100 0.3 to 6.9 1.0 to 8 0.1 to 0.6 bar 300 20.7 500 34.5

Sensor Type P, 303 stainless steel piston and 1/4" NPT (female) pressure connection, Buna N O-Ring. Non-Belleville actuation.
Range Code Adjustable Range
Lower end of range on fall;
Higher end on rise		 Deadband Over Range Pressure Proof Pressure
psi bar psi bar psi bar psi bar
A 300 to 1200 20.7 to 82.7 30 to 200 2.1 to 13.8 6000 413.7 10000 689.5
B 600 to 2600 41.4 to 179.3 50 to 350 3.4 to 24.1 6000 413.7 10000 689.5
C 1200 to 5500 82.7 to 379.2 100 to 800 6.9 to 55.2 6000 413.7 10000 689.5

DIFFERENTIAL PRESSURE MODEL CHART
Sensor Type K, epoxy coated aluminum pressure housing with Kapton® diaphragm, Buna N sealing diaphragms and 1/8" NPT (female) pres-sure connections. Non-Belleville actuation. 303/304 stainless steel mounting bracket attached.
Range Code Adjustable Range
Lower end of range on fall;
Higher end on rise		 Deadband Over Range Pressure Proof Pressure
wcd mbar wcd mbar psi bar psi bar
1 0.7 to 10 1.7 to 24.9 0.2 to 1 0.5 to 2.5 30 Hg Vac to 200 -1.0 to 13.8 400 27.6
2 3 to 20 7.5 to 49.8 0.3 to 1.5 0.7 to 3.7 30 Hg Vac to 200 -1.0 to 13.8 400 27.6
3 10 to 150 24. 9 to 373.4 0.3 to 5 0.7 to 12.4 30 Hg Vac to 200 -1.0 to 13.8 400 27.6
  psid bar psi bar psi bar psi bar
4 2 to 20 0.1 to 1.4 0.3 to 1.5 20.7 to 103.4 mbar 30 Hg Vac to 1200 -1.0 to 82.7 2500 172.4
5 5 to 80 0.3 to 5.5 1 to 8 0.1 to 0.6 30 Hg Vac to 1200 -1.0 to 82.7 2500 172.4
6 10 to 150 0.7 to 10.3 1 to 10 0.1 to 0.7 30 Hg Vac to 1200 -1.0 to 82.7 2500 172.4

DIFFERENTIAL PRESSURE MODEL CHART
Sensor Type K, epoxy coated aluminum pressure housing with Kapton® diaphragm, Buna N sealing diaphragms and 1/8" NPT (female) pres-sure connections. Non-Belleville actuation. 303/304 stainless steel mounting bracket attached. DPDT Switch (double pole double throw).
Range Code Adjustable Range
Lower end of range on fall;
Higher end on rise		 Deadband Over Range Pressure Proof Pressure
wcd mbar wc mbar psi bar psi bar
1 0.7 to 10 1.7 to 24.9 0.2 to 1.5 0.5 to 3.7 30 Hg Vac to 200 -1.0 to 13.8 400 27.6
2 3 to 20 7.5 to 49.8 0.3 to 2 0.7 to 5.0 30 Hg Vac to 200 -1.0 to 13.8 400 27.6
3 10 to 150 24. 9 to 373.4 0.3 to 8 0.7 to 19.9 30 Hg Vac to 200 -1.0 to 13.8 400 27.6
  psid bar psi bar psi bar psi bar
4 2 to 20 0.1 to 1.4 0.3 to 3 20.7 to 206.8 mbar 30 Hg Vac to 1200 -1.0 to 82.7 2500 172.4
5 5 to 80 0.3 to 5.5 1 to 10 0.1 to 0.7 30 Hg Vac to 1200 -1.0 to 82.7 2500 172.4
6 10 to 150 0.7 to 10.3 1 to 15 0.1 to 1.0 30 Hg Vac to 1200 -1.0 to 82.7 2500 172.4

TEMPERATURE MODEL CHART
Sensor Type R, Standard Capillary: 6 ft., 304 SS
Range Code Adjustable Range Max Temperature Bulb Size
°F °C °F °C
R1 -130 to 120 -90 to 48.9 170 76.7 3/8 O.D. x 4-7 / 8"
R2 0 to 150 -17.8 to 65.6 200 93.3 3/8 O.D. x 7-1 / 4"
R3 50 to 300 10 to 148.9 350 176.7 3/8 O.D. x 4-7/8"
R4 150 to 650 65.6 to 343.3 700 371.1 3/8 O.D. x 4"

PRESSURE
Dimension A
Types Inches mm NPT
2 4.88 123.9 1/2"
3 4.88 123.9 1/2"
4 4.88 123.9 1/4"
5 4.88 123.9 1/2"
6 4.88 123.9 1/4"
7 5.41 137.5 1/2"
8 4.88 123.9 1/4"
9 5.41 137.5 1/2"
P1-P3 5.38 136.5 1/4"
K1-K3 6.69 169.9 1/8"
K4-K6 6.94 176.2 1/8"
R1-R4 5.00 126.9 N/A


BULB DIMENSIONS
Dimension A
Types Inches mm
R1 4-7/8 " 123.8
R2 7-1/4 " 184.2
R3 4-7/8 " 123.8
R4 4 " 101.6

ORDERING INFORMATION

BUILD PART NUMBER PER TABLE BELOW
ORDER NUMBER EXAMPLE: 12.SLSN2AM201

PLEASE CALL 1-800-253-2497 TO ORDER THESE ITEMS
MODEL HOUSING MATERIAL ELECTRICAL RATING SWITCH TYPES ELECTRICAL CONDUIT SENSOR TYPE (See Tables) RANGE (See Tables)
12 S = Stainless Steel L = 1 amp S = SPDT N = 1/2" NPT male 2 = Welded 316 stainless steel diaphragm, 1/2" NPT (female) pressure connection A
H = 5 amp D = DPDT 3 = Teflon® coated Polyimide (Kapton®) diaphragm, Buna N O-ring, 1/2" NPT (female) pressure connection B
All switches have limited DC capabilities. Consult factory for details.     M = M20 metric thread C
4 = Teflon® coated Polyimide (Kapton®) diaphragm, Buna N O-ring, 1/4" NPT (female) pressure connection D
  E
5 = 316L stainless steel diaphragm, Viton® O-ring, 1/2" NPT (female) pressure connection F
6 = 316L stainless steel diaphragm, Viton® O-ring, 1/4" NPT (female) pressure connection G
7 = Welded 316L stainless steel diaphragm, 1/2" NPT (female) pressure connection H
8 = Kapton® diaphragm, Buna N O-ring, 1/4" NPT (female) pressure connection* 1
9 = 316L stainless steel welded diaphragm, 1/2" NPT (female) pressure connection* 2
P = 303 stainless steel piston, Buna N O-ring, 1/4" NPT (female) pressure connections* 3
K = Kapton® diaphragm, Buna N sealing diaphragm, 1/8" NPT (female) pressure connections* 4
R = Remote bulb & capillary, temperature 5
  6
 
OPTIONS
M201 Factory set switch, specify increasing or decreasing pressure
M277 Range in kPa or mPa on nameplate, factory selected. NOT AVAILABLE ON TEMPERATURE VERSIONS
M278 Range in kg/cm2 on nameplate. NOT AVAILABLE ON TEMPERATURE VERSIONS    
M404 Flameproof compliance for Ukraine per Gosnadzorohrantruda standards
M405 European ATEX intrinsic safety compliance
M406 Flameproof and intrinsic safety compliance per Russian Gosgortechnadzor standards 
M407 CE compliance to Pressure Equipment Directive (category IV). NOT AVAILABLE ON TEMPERATURE VERSIONS
M421 Gosgortechnadzor flameproof junction box, pre-wired (not UL approved or ATEX certified)   
M423 ATEX flameproof compliant junction box, pre-wire (not UL approved)
M430 Cover lock
M444 Paper ID tag  
M446  Stainless steel ID tag and wire attachment
M460 External ground screw; required for non-metallic conduit systems (ATEX installations only)
M480 316 Stainless steel construction, enclosure and pressure connection(s) only, sensor material cannot be changed. Must order with option code M516 for sensor type P 
M511 1/4" NPT (male) pressure connection for sensor types 3, 4, 5, 6 and 8 only
M513 UL/CSA approved, explosion proof junction box, pre-wired (not approved for ATEX or as enclosure type 4X). NOT AVAILABLE ON METRIC THREAD ELECTRICAL CONDUIT VERSION
M515 DIN Connector-4 terminal; conforms to DIN 43650 Form A, (not approved for Class I Div. 1 & 2or ATEX flame proof requirements). NOT AVAILABLE ON DPDT OR METRIC THREAD ELECTRICAL CONDUIT VERSIONS
M516 316 Stainless steel 1/4" NPT (female) pressure connection and piston. AVAILABLE SENSOR TYPE P ONLY
M540 Viton® construction (deadband and low end of range will increase slightly); wetted partsinclude Kapton diaphragm, Viton® O-ring and sealing diaphragm. AVAILABLE SENSOR TYPES K AND P ONLY
M550 Oxygen service cleaning; internal construction and materials may change (includes Viton®diaphragm and/or O-ring when applicable). NOT AVAILABLE ON SENSOR TYPES 3, 4, AND 8 NC1NACE certificate
* non-Belleville actuation

OPTIONS FOR TEMPERATURE MODELS
UNION CONNECTORS:
Option Replacement Number Description
304 Stainless Steel W028 SD6213-28 1/2" NPT w/ 3/4" bushing
W046 SD6213-46 3/4" NPT
W050 SD6213-50 1/2" NPT
THERMOWELLS For all bulb & capillary switches
Option Replacement Number Description
316 Stainless Steel W076 SD6225-76 3/4" NPT, 4.5" BT
W193 SD6225-193 1/2" NPT, 4.5" BT
W119 SD6225-119 3/4" NPT, 7.5" BT
W177 SD6225-177 1/2" NPT, 7.5" BT
OPTIONAL LENGTHS
Optional capillary length to 50' available in copper or 304 SS.
Armor or Teflon® capillary protection available to lengths less than or equal to capillary length.
12 Series: Pressure, Differential Pressure & Tempurature Switches
PRODUCT SPECIFICATIONS > INSTRUMENTATION