120 Series, Pressure, Vacuum, Diff. Pressure & Temp. Switches

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 H121, SINGLE SWITCH WITH EXTERNAL ADJUSTMENT VIA REFERENCE DIAL, 1 CONDUIT
MODEL H122, DUAL SWITCH WITH EXTERNAL ADJUSTMENT VIA REFERENCE DIAL, 1 CONDUIT
MODEL H122P, TWO HERMETICALLY SEALED SINGLE SWITCHES, EXTERNAL REFERENCE DIAL ADJUSTMENT,
1 CONDUIT
Range/Material Code	Adjustable Set Point Range		Deadband		**Proof Pressure		Dial Divisions
Range/Material Code	psi	bar	psi	bar	psi	bar	psi
Phosphor bronze bellows with 1/4" NPT (female) nickel-plated brass pressure connection
270	0 to 200	0 to 13.8	1.5 to 8	0.1 to 0.6	250	17.2	5
274	0 to 300	0 to 20.7	2 to 10	0.1 to 0.7	350	24.1	10
Buna-N diaphragm and O-Ring with 1/4" NPT (female) aluminum pressure connection and cap
450	30" Hg Vac to 0	-1 to 0 mbar	0.1 to 0.4"wc	0.003 to 0.01	225	15.5	0.5" Hg
452	30" Hg Vac to 20 psi	-1 to 1.4 mbar	0.1 to 1" Hg	0.003 to 0.03	225	15.5	1" & 0.5 psi
453	0 to 20	0 to 1.4 mbar	0.05 to 0.2	0 to 0.01	225	15.5	0.5
454	0 to 30	0 to 2.1 mbar	0.05 to 0.3	0 to 0.02	225	15.5	0.5
Teflon^® diaphragm and O-Ring with 1/4" NPT (female) 316L stainless steel pressure connection and cap
550	30" Hg Vac to 0	-1 to 0	0.1 to 0.6" Hg	0.003 to 0.02	225	15.5	0.5" Hg
552	30" Hg Vac to 20 psi	-1 to 1.4	0.2 to 1" Hg	0.007 to 0.03	225	15.5	1" & 0.5 psi
553	0 to 20	0 to 1.4	0.05 to 0.3	0 to 0.02	225	15.5	0.5
554	0 to 30	0 to 2.1	0.1 to 0.4	0.01 to 0.03	225	15.5	0.5
555	0 to 100	0 to 6.9	0.25 to 0.75	0.02 to 0.05	225	15.5	2
Buna-N diaphragm and O-Ring with 1/4" NPT (female) nickel-plated brass pressure connection; Optional Viton^® diaphragm & O-Ring available for code 701 & 703
701	3 to 30	0.2 to 2.1	1 to 3	0.07 to 0.2	1000	68.9	0.5
702	10 to 100	0.7 to 6.9	1 to 5	0.07 to 0.3	1000	68.9	2
703	30 to 300	2.1 to 20.7	2 to 7	0.14 to 0.5	1000	68.9	10
704	50 to 500	3.4 to 34.5	3 to 12	0.2 to 0.8	2500	172.4	10
705	200 to 1000	13.8 to 68.9	5 to 25	0.3 to 1.7	2500	172.4	25
** Proof Pressure: The maximum pressure to which a pressure sensor may be occasionally subjected, which causes no permanent damage. Unit may require calibration.

DIFFERENTIAL PRESSURE MODEL J120K SINGLE SWITCH WITH INTERNAL ADJUSTMENT, DUAL CONDUIT
Range/Material Code	Adjustable Set Point Range High end of range on rise, low end on fall		Deadband		***Working Pressure		**Proof Pressure
Range/Material Code	"wcd/psid	mbar/bar	"wc/psi	mbar/bar	psi	bar	psi	bar
Welded 316L bellows with 1/2" NPT (female) pressure connections
S147B	3 to 30 psid	0.2 TO 2.1 bar	0.3 TO 1.5 psi	0.02 to 0.1bar	30" Hg Vac to 100	-1 to 6.9	300	20.7
S157B	10 to 100 psid	0.7 TO 6.9 bar	0.5 TO 2 psi	0.03 to 0.14 bar	30" Hg Vac to 180	-1 to 12.4	300	20.7
Brass bellows with 1/4" NPT (female) nickel-plated brass pressure connections
147	3 to 30 psid	0.2 to 2.1 bar	0.3 to 1.5 psi	0.02 to 0.1bar	30" Hg Vac to 100	-1 to 6.9	180	12.4
157	10 to 100 psid	0.7 to 6.9 bar	0.5 to 2 psi	0.03 to 0.14 bar	30" Hg Vac to 150	-1 to 10.3	180	12.4
316L stainless steel bellows and 1/4" NPT (female) pressure connections
367	10 to 100 psid	0.7 to 6.9	4 to 10	0.3 to 0.7	0 to 350	0 to 24.1	500	34.5
Buna-N diaphragm and O-Ring with stainless steel 1/4" NPT (female) pressure connections
36	3 to 30 psid	0.2 to 2.1	1 to 5	0.07 to 0.3	0 to 350	0 to 24.1	1000	68.9
37	10 to 100 psid	0.7 to 6.9	2 to 8	0.1 to 0.6	0 to 500	0 to 34.5	1000	68.9
38	30 to 300 psid	2.1 to 20.7	2 to 15	0.1 to 1.0	0 to 1000	0 to 68.9	2500	172.4
39	50 to 500 psid	3.4 to 34.5	3 to 20	0.2 to 1.4	0 to 1000	0 to 68.9	2500	172.4
Buna-N diaphragm and O-Ring with 1/4" NPT (female) aluminum pressure connections
455	5 to 80 "wcd	12.4 to 200 mbar	1 to 4"wcd	2 to 10 mbar	30" Hg Vac to 225	-1 to 15.5	225	15.5
456	2 to 20 psid	0.1 to 1.4 bar	0.1 to 0.3 psi	6.9 to 20.7 mbar	30" Hg Vac to 225	-1 to 15.5	225	15.5
457	3 to 30 psid	0.2 to 2.1 bar	0.1 to 0.4 psi	6.9 to 27.6 mbar	30" Hg Vac to 225	-1 to 15.5	225	15.5
Kapton^®diaphragm, Buna-N sealing diaphragms and epoxy coated aluminum 1/8" NPT (female) pressure connections
540	0.2 to 7"wcd	0.5 to 17.4 mbar	0.05 to 0.4"wc	0.1 to 0.1 mbar	200	13.8	400	27.6
541	1 to 20"wcd	2.5 to 49.7 mbar	0.1 to 0.7"wc	0.2 to 1.7 mbar	200	13.8	400	27.6
542	5 to 50"wcd	12.4 to 124.4 mbar	0.2 to 2.0"wc	0.5 to 5.0 mbar	200	13.8	400	27.6
543	10 to 200"wcd	24.9 to 497 mbar	0.5 to 6.0"wc	1.2 to 14.9 mbar	200	13.8	400	27.6
544	2 to 20 psid	0.1 to 1.4 bar	0.1 to 0.8 psi	6.9 to 55.2 mbar	1200	82.7	2500	172.4
545	5 to 50 psid	0.3 to 3.4 bar	0.2 to 1.6 psi	0 to 0.1 bar	1200	82.7	2500	172.4
546	0 to 125 psid	0.7 to 8.6 bar	0.4 to 3.5 psi	0 to 0.2 bar	1200	82.7	2500	172.4
547	50 to 250 psid	3.4 to 17.2 bar	1.5 to 7.2 psi	0.1 to 0.5 bar	1200	82.7	2500	172.4
548	100 to 500 psid	6.9 to 34.5 bar	2.0 to 12.0 psi	0.1 to 0.8 bar	1200	82.7	2500	172.4
Teflon^® and Buna-N diaphragms, Buna-N O-Ring with 1/4" (female) aluminum pressure connections
559	10 to 100 psid	0.7 to 6.9 bar	0.2 to 1 psi	14 to 69 mbar	30" Hg Vac to 225	-1 to 15.5	225	15.5
** Proof Pressure: The maximum pressure to which a pressure sensor may be occasionally subjected, which causes no permanent damage. Unit may require calibration.
***Working Pressure Range: The pressure range within which two opposing sensors can be safely operated and still maintain set point adjustability provided the difference in pressure between them does not exceed the designated adjustable range.

DIFFERENTIAL PRESSURE MODEL H121K SINGLE SWITCH WITH EXTERNAL
ADJUSTMENT VIA REFERENCE DIAL
DIFFERENTIAL PRESSURE MODEL H122K DUAL SWITCH WITH EXTERNAL
ADJUSTMENT VIA REFERENCE DIAL
Range/Material Code	Adjustable Set Point Range High end of range on rise, low end on fall		Deadband		***Working Pressure		**Proof Pressure
Range/Material Code	"wcd/psid	mbar/bar	"wcd/psi	mbar/bar	psi	bar	psi	bar
Welded 316L bellows with 1/2" NPT (female) pressure connections
S147B	3 TO 30 psid	0.2 TO 2.1 bar	0.3 TO 2 psi	20 to 140 mbar	30" Hg Vac to 100	-1 to 6.9	300	20.7
S157B	10 TO 100 psid	0.7 TO 6.9 bar	0.5 TO 3 psi	30 to 200 mbar	30" Hg Vac to 180	-1 to 12.4	300	20.7
Brass bellows with 1/4" NPT (female) nickel-plated brass pressure connections
147	3 to 30 psid	0.2 to 2.1 bar	0.3 TO 2 psi	20 to 140 mbar	30" Hg Vac to 100	-1 to 6.9	180	12.4
157	10 to 100 psid	0.7 to 6.9 bar	0.5 TO 3 psi	30 to 200 mbar	30" Hg Vac to 150	-1 to 10.3	180	12.4
Buna-N diaphragm and O-Ring with 1/4" NPT (female) aluminum pressure connections
456	2 to 20 psid	0.1 to 1.4 bar	0.1 to 0.3 psi	0.01 to 0.02	30" Hg Vac to 225	-1 to 15.5	225	15.5
457	3 to 30 psid	0.2 to 2.1 bar	0.1 to 0.4 psi	0.01 to 0.03	30" Hg Vac to 225	-1 to 15.5	225	15.5
Teflon^® and Buna-N diaphragms, Buna-N O-Ring with 1/4" (female) aluminum pressure connections
559	10 to 100 psid	0.7 to 6.9 bar	0.2 to 1 psi	0.01 to 0.07	30" Hg Vac to 225	-1 to 15.5	225	15.5
*Over Range Pressure: The maximum pressure that may be applied continuously without causing damage and maintaining set point repeatability
** Proof Pressure: The maximum pressure to which a pressure sensor may be occasionally subjected, which causes no permanent damage. Unit may require calibration.
***Working Pressure Range: The pressure range within which two opposing sensors can be safely operated and still maintain set point adjustability provided the difference in pressure between them does not exceed the designated adjustable range.

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