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

(Page 6 of 9)
Page 1 2 3 4 5 6 7 8 9



Switch Options
0140 Gold contacts, 1 amp 125 VAC resistive, NOT AVAILABLE MODELS H122P, 820E, & 822E
0500 Close deadband, 5 amp 125/250 VAC resistive. NOT AVAILABLE MODEL H122P Ranges 520-535
1010 DPDT switch, 10 amp 125/250 VAC resistive. NOT AVAILABLE TEMPERATURE VERSIONS; MODELS H122, H122P, H122K; OR J120K RANGES 36-39, 367, AND 540-548; OR J120 RANGES 171-194, 483-494, 520-535, 560-567, 680
1070 10 amp 125 VDC or VAC resistive; deadband and minimum set point will increase. NOT AVAILABLE MODELS 820E, 822E, H122P, H122K, B122, AND J120K RANGES 36-39; J120 RANGES 171-194, 483-494, 520-535
1180 Hermetically sealed SPDT, 11 amp 125/250 VAC resistive, must be specified with model H122P. NOT AVAILABLE MODELS B122, E122, H122, H121K and H122K, 820 AND 822E; deadband and minimum set point will increase
1190 Hermetically sealed DPDT, 11 amp 125/250 VAC; products set on rising pressure or temperature due to inherent separation of circuits on falling pressure or temperature; specify option 1195 if setting on fall is required; deadband and minimum set point will increase. Not available models 820E, 822E, B121, B122, E121, E122, H121, H122, H121K, H122K, H122P or ranges 523, 533
1195 Hermetically sealed DPDT, 11 amp 125/250 VAC; products set on falling pressure or temperature due to inherent separation of circuits on rising pressure or temperature; specify option 1190 if setting on rise is required; deadband and minimum set point will increase. Not available models 820E, 822E, B121, B122, E121, E122, H121, H122, H121K, H122K, H122P or ranges 523, 533
1519* Adjustable deadband, 15 amp 125/250/480 VAC resistive; adjustable wheel changes rise setting only; if adjustment of fall setting is required use primary adjustment; deadband and minimum set point will increase. Not available models 820E, 822E, B121, B122, E121, E122, H121, H122, H121K, H122K, H122P or ranges 171-194, 483-494, 520-535, 612-616
1530 External manual reset, 15 amp 125/250/480 VAC resistive; latches on rise only. Not available models 820E, 822E, B121, B122, E121, E122, H121, H122, H121K, H122K, H122P ranges 520-535 or with ATEX certification 
1535 High ambient, 15 amp 125/250 VAC resistive; temperatures up to 250°F (120°C). Not available models 820E, 822E, H122P ranges 520-535 1537 
1537 Vapor sealed switch, 15 amp 125/250 VAC resistive. Not available models 820E, 822E, H122P or ranges 520-535    
1539 Fungus resistant case, 15 amp 125/250 VAC resistive. Not available models 820E, 822E, H122P or ranges 520-535  
2000 20 amp 125/250 VAC resistive. Not available ranges 520-535, 540-548
3000 30 amp 125/250/300 VAC resistive. Not available models 820E. 822E, B121, B122, H121, H122, H121K, H122K, H122P for ranges 36-39, 171-193, 483-493, 520-535, 540-548, 560-567 
*Please note: In order to accommodate free movement of adjustable wheel, left hand electrical conduit is permanently sealed.

Sensor Options
M504 316L stainless steel stem. Available temperature models 120 and 121 only
M540 Viton® construction; (deadbands and low end of range may increase slightly) wetted parts include Viton® diaphragm and O-Ring. Available ranges 36-39, 450-457, 540-548 (Kapton® diaphragm, Viton® O-ring and sealing diaphragms), 612-616 (O-ring only) with standard pressure connection. Available MODEL J120 RANGES 701-705 and MODEL H121 and H122 RANGES 701-703 with stainless steel pressure connection.

Optional Sensor For “WC Ranges. Available for range codes 52-525
XC001 Aluminum pressure connection, Viton® diaphragm, Viton® O-Ring
XC002 Aluminum pressure connection, Kapton® diaphragm, Buna-N O-Ring
XC003 Aluminum pressure connection, Kapton® diaphragm, Viton® O-Ring
XC004 316L Stainless steel pressure connection, 316L Stainless steel diaphragm, Viton® O-Ring (Over range pressure is limited to 100 psi)
XC005 316L Stainless steel pressure connection, Viton® diaphragm, Viton® O-Ring
XC006 316L Stainless steel pressure connection, Kapton® diaphragm, Viton® O-Ring
XC007 316L Stainless steel pressure connection, Teflon® diaphragm, Viton® O-Ring

Optional Sensor Material For Corrosive Media, Available Range Codes 183-189, 483-489
XD002 Hastelloy® C diaphragm
XD003 Monel® diaphragm
XD004 Tantalum diaphragm
XP111 Hastelloy® B pressure connection
XP112 Hastelloy® C pressure connection
XP113 Monel® pressure connection
XR211 Kalrez® O-Ring
XR212 Silicone O-Ring. Not available models 188-189, 488-489
XR213 Ethylene propylene O-Ring
XR214 Aflas® O-Ring

Other Options
M201 Factory set one switch
M202 Factory set two switches. Not available single switch versions
M210 Differential pressure indication. Available on H121K, H122K, RANGES 147, 157, S147B, S157B only
M277 Range indicated on nameplate in kPa or MPa. Not available on temperature versions
M278 Range indicated on nameplate in Kg/cm2. Not available on temperature versions
M300 NEMA 4 construction, available models 820E & 822E only
M320 Tamper resistant cover for indication portion of control , internal adjustment, available models 820E & 822E only
M407 CE Compliance to Pressure Equipment Directive (category IV). Not available on ranges 126, 137, 520-524, 530-534, 550, 551, S126B, S137B and all temperature models
M440 Cover chain
M444 Paper ID tag
M446 Stainless steel ID tag & wire attachment
M450 Breather drain. Not available with options 1530, M210, M415 or with ATEX certification
M550 Oxygen service cleaning; internal construction may change
6361-704 Surface and pipe mounting hardware. (required for ranges 520-535, 540-548 when surface mounting)

Also Available
Separable thermowells
Optional immersion stem and capillary lengths
Armor cable to protect capillaries
Union connectors
150# and 300# flanges (consult factory for part numbers)

Page 1 2 3 4 5 6 7 8 9

      For assistance call 978-568-3400

pumps | valves | instrumentation | new products | contact clark | site/product directory | enewsletter | home