PRODUCT SPECIFICATIONS > INSTRUMENTATION
Clark Solutions
120 Series, Pressure, Vacuum, Diff. Pressure & Temp. Switches
Explosion Proof, Adjustable Ranges 30" Vac to 6000 PSI,
-180°F to 650°F

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Model 24 Differential Pressure Switch
DESCRIPTION
As safety requirements become more stringent, the determining factor in specifying an industrial pressure, differential pressure and/or temperature switch rests upon that switch protecting equipment, processes and personnel. Meeting hazardous location requirements through adherence to UL, CSA, and ATEX standards, the 120 Series is the choice where potentially explosive or highly corrosive atmospheres exist.

The 120 Series offers a variety of pressure, differential pressure, vacuum and temperature ranges, as well as port connections, wetted materials and sensor types. With common, flexible “platforms”, models can quickly be adapted at the factory for special requirements, such as ranges, process connections and electrical ratings. Typical industries using 120 Series switches include chemical, petrochemical, refinery, oil and gas pipelines & production and pharmaceuticals.
FEATURES
  • APPROVALS INCLUDE CULUS, ATEX & SAA; COMPLIANCE WITH CE AND NACE STANDARDS
  • INTERNAL ADJUSTMENT OR EXTERNAL ADJUSTMENT VIA CALIBRATED DIALS WITH TAMPER RESISTANT COVER
  • SINGLE OR DUAL OUTPUT
  • WIDE VARIETY OF SENSOR MATERIALS
  • OPTIONAL HASTELLOY®,MONEL®AND TANTALUM SENSOR MATERIAL FOR CORROSIVE MEDIA
  • FLUSH MOUNT SANITARY SENSORS
  • STAINLESS STEEL, HASTELLOY®,MONEL®FLANGES CONFORMING TO ANSI STANDARDS
  • INDICATING DIFFERENTIAL PRESSURE MODULE
  • MOST MODELS AVAILABLE FOR IMMEDIATE DELIVERY!
SPECIFICATIONS
GENERAL
Storage Temperature: -65° to 160°F (-54 to 71°C)
Ambient Temperature: -58° to 160°F (-50 to 71°C);
      ranges 36-39, 520-525, 540-548, 701-705: 0 to
      160°F (-17 to 71°C); Models 820E, 822E:-40° to
      160°F (-40 to 71°C) set point typically shifts less
      than 1% of range for a 50°F (28°C) ambient
      temperature change; less than 2% for types
      E121 & E122
Set Point Repeatability: Temperature models: ±1% of
      adjustable range. Pressure model ranges 126-164,
      S126B-S164B, 171-174, 270-274, 358-376, 520-535,
      540-543, 560-564, 701-705: ±1% of adjustable
      range; ranges 450-559: ±1/2% of adjustable range;
      ranges 36-39,183-194, 483-494, 544-548, 565-567,
      612-680: ±1-1/2% of adjustable range
Shock: Set point repeats after 15 G, 10 millisecond
      duration
Vibration: Set point repeats after 2.5 G, 5-500 Hz
Enclosure: Die cast aluminum (max. 0.4% copper), epoxy
      powder coated; gasketed; coverlock; internal set
      point lock standard on types J, C, F; gasketed
      aluminum tamper-resistant dial cover on types B, H,
      E; aluminum name plate
Enclosure Class: Certified to enclosure type 4X. Types
      820E, 822E; designed to meet NEMA 4 requirements
      with option M300; Class I, Division 1 product meet
      enclosure type 7; Class II, Division 1 products meet
      enclosure type 9. Certified to IP66 requirements
Switch Output: One, two or three SPDT; switches may be
      separated up to 100% of range; except ranges 521-
      524, 531-534 (50%); ranges 520, 525, 530, 535, 570
      -572 (30%); Two SPDT hermetic sealed switches
      available on H122P models
Electrical Rating: 15 A 125/250/480 VAC resistive except
      Pressure model H122P; 11A 125/250 VAC resistive;
      Temperature range codeHTFP: 22A 480VAC resistive

Weight: 3-7.5 lbs; Varies with model
Reference Scales: Types B, E & H: external dial. Scale
      divisions vary with range.
Electrical Connection: Type H, B, E: one 3/4" NPT; Type J,
      C, F, 820E, 822E: two 3/4" NPT; terminal block
      standard
Pressure Connection: Ranges S126B-S164B, 171-194,
      483-494, 520-535: 1/2" NPT (female); ranges 560-
      564: 2" sanitary connection; ranges 565-567: 1 1/2"
      sanitary connection; ranges 540-548: 1/8" NPT
      (female); all others: 1/4" NPT (female)
Temperature Assembly: Bulb and capillary: 6 feet
      304 stainless steel (standard) except for E121-
      13273 and E122-13321: 10 feet; Immersion
      stem: nickel-plated brass (standard) except for
      B121-13272 and B122-13322: stainless steel.
      Fill: Range 1BS: solvent filled; ranges 2BS-8BS:
      non-toxic oil filled

Temperature Deadband: Models F120, 820E, 822E:
      typically 1%; B-, C-, and E- 121 and 122: typically
      2% of range under laboratory conditions (70°F
      [21°C] ambient circulating bath at rate of 1/2°F
      per minute change)
Pressure Deadband: See model charts
Differential Pressure Indication: Differential pressure
      indication available models H121K and H122K
      with option M210; accuracy approximately ±1%
      mid 50% of range, ±3% at ends; window is
      plexiglass and gasketed; indicator may be field
      adjusted for approximately ±1% accuracy at any
      set point within range
Temperature Indication: Temperature indication
      available models 820E and 822E. Indication
      accuracy is +1% of adjustable range
Approvals:
      Class I, Division 1 & 2, Groups B, C & D
      Class II, Division 1 & 2, Groups E, F & G
      Class III
      Class I, Zone 1, Group IIB + H2 T6

      UL Listed, cUL Certified
      Pressure: UL 50, 698; CSA C22.2 No. 25-1966,
      30-M1986, CEC Part 1 – File #E40857
      Temperature: UL 50, 698; CSA C22.2 No. 25-
      1966, 30-M1986, CEC Part 1 – File #E43374

      CENELEC/DEMKO A/S (N.B. #0539)
      Demko A/S certified to ATEX Directive (94/9/EC)
      II 2 G EEx d IIC T6, Tamb.= -40°C to +71°C
      (-40°F to +160°F), IP 66
      II 2 D T+85°C, Tamb.= -40°C to +71 °C (-40°F
      to +160°F), IP 66
      EN 50 014, EN 50 018, EN 50 281, EN 60529
      Certificate #DEMKO 03 ATEX 0305048

      CENELEC/TÜV Süddeutschland Bau und Betrieb
      GmbH (N.B. #0036)
      TÜV certified to PED (97/23/EC)
      Category IV, Module H1 (must select option
      M407)
      Certificate #USA 02/04/38/001 thru USA
      02/07/38/033
      UEC Compliant to LVD (73/23/EC & 93/68/EEC)
      Products rated lower than 50 VAC and 75 VDC
      are outside of the scope of the LVD The Low
      Voltage Directive does not apply to  products
      for use in hazardous locations
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