120 Series Pressure, Vacuum,
Differential Pressure & Temperature Switches

Terminal block wiring

Safety considerations are often the determining factor in specifying an industrial pressure or temperature switch. Where potentially explosive or highly corrosive atmospheres exist, the 120 Series meets UL, CSA, FM and CENELEC standards to protect equipment and personnel.

• Specifications
• Approvals
• Model Charts
• Options

Specifications

Storage temperature:	-65 to 160°F (-54 to 71°C)
Ambient temperature limits:	-58 to 160°F (-50 to 71°C); models 36-39, 520-525, 701-705: 0 to 160°F(-17 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 models 50-55, S50B-S55B, 126-164, S126B-S164B, 171-174, 270-274, 358-376, 520-535, 560-564, 701-705: ±1% of adjustable range; models 450-559: ±1/2% of adjustable range; models 36-39, 183-194, 483-494, 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; internal set point lock standard on types J, C, F; gasketed aluminum tamper-resistant dial cover on types B, H, E; aluminum nameplate
Enclosure classification:	Complies with NEMA 4X; 7; 9; IP66 requirements
Switch output:	One or two SPDT; dual switch may be separated up to 100% of range; switches may be wired "normally open" or "normally closed"
Electrical rating:	15 amps 125/250/480 VAC resistive
Reference scales:	Types B, E & H: external scale; type J: internal reference scale
Weight:	3-8 lbs. Varies with model
Electrical connection:	3/4" NPT; terminal block standard
Pressure connection:	Models S50B-S55B, S126B-S164B, 171-194, 483-494, 520-535: 1/2" NPTF; models 560-564: 2" sanitary connection; models 565-567: 1 1/2" sanitary connection; all others: 1/4" NPTF
Temperature assembly:	Bulb and capillary: 6 feet 304 stainless steel; Immersion stem: nickel-plated brass (standard length only); 316L stainless steel optional
Fill:	Model 1BS: solvent filled; models 2BS-8BS: non-toxic oil filled
Temperature deadband:	Type F: typically 1%; type B, C, and E: typically 2% of range under laboratory conditions (70°F [21°C] ambient circulating bath at rate of 1/2°F per minute change)
Heat tracing or Freeze protection:	Switches designed for heat tracing and freeze protection are available for types B121 and E121; specifications are the same as above except: types B121-13272, B122-13322 have electrical rating 22 amps/480 VAC; types E121-1327, E122-13321 have 10 foot stainless steel capillary and 22 amps/480 VAC switch
Differential pressure indicator (option M210):	Differential pressure indication available types J120K, H121K and H122K with indicator (option M210); accuracy approximately 1 1/2% 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

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Approvals

Class I, Division 1 & 2, Groups B,C,D;
Class II, Division 1 & 2, Groups E,F,G;
Class III

UL listed
Temperature: UL 873, file # E43374
UL 1203, file # E43374
Pressure: UL 508, file # E40857
UL 698, file # E40857

CSA Certified
Temperature: CSA C22.2 no. 24,
file # LR7814;
CSA C22.2 no. 25, file # LR7814
CSA C22.2 no. 30, file # LR7814
Pressure: CSA C22.2 no. 14,
file # LR39690;
CSA C22.2 no. 25, file # LR39690
CSA C22.2 no. 30, file # LR39690

CENELEC flame proof construction
per EEx d IIC T6, IP66 EN 50 014/50 018
(Specify Option "Q")

SAA Ex d IIC T6, IP66, Class 1, Zone 1
AS 2380.2 and AS 1939
(Available from UE Australia; specify Option M416)

Compliance to NACE MR-0175
(Not available with all models, see Option M411 for availability)

FM Approved, Class 3615 and 3600
(Not available with all models, see Option M415 for availability)

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Model Charts

Pressure Model Charts

Products listed below represet a sampling of our most popular 120 Series products. For complete information, request a copy of our Process Measurements and Control Catalog.

Type J120
Model	Adjustable Set Point Range Low end of range on fall; High end of range on rise		Deadband		Over Range Pressure		Proof Pressure
	"WC	mBar	"WC	mBar	psi	Bar	psi	Bar
Buna N diaphragm and O-ring with 1/2" NPTF epoxy coated aluminum pressure connection
520	300 VAC to 0	-742,24 to 0	0.2 to 8	0,50 to 19,90	200	13,8	400	27,58
521	10 VAC to 10	-24,91 to 24,91	0.1 to 0.6	0,25 to 1,49	200	13,8	400	27,58
522	50 VAC to 50	-124,54 to 124,54	0.1 to 3	0,25 to 7,47	200	13,8	400	27,58
523	0.5 to 5	1,25 to 12,45	0.1 to 0.3	0,25 to 0,75	200	13,8	400	27,58
524	2.5 to 50	6,23 to 124,54	0.1 to 0.8	0,25 to 1,99	200	13,8	400	27,58
525	10 to 250	24,91 to 622,70	0.1 to 6	0,25 to 14,94	200	13,8	400	27,58
Welded 316L stainless steel diaphragm with 1/2" NPTF 316L stainless steel pressure connection, large 0.72" orifice for clean-out purposes
171	1 to 20	0,07 to 1,38	0.1 to 1	0,0007 to 0,07	300	20,7	500	34
172	2 to 50	0,14 to 3,45	0.1 to 1.5	0,0007 to 0,10	300	20,7	500	34
173	4 to 100	0,28 to 6,90	0.1 to 2.5	0,0007 to 0,17	300	20,7	500	34
174	8 to 200	0,56 to 13,79	0.1 to 3.5	0,0007 to 0,24	300	20,7	500	34

Model	Stock Number	Adjustable Set Point Range Low end of range on fall; High end of range on rise		Deadband			Over Range Pressure		Proof Pressure
		psi	Bar	psi		Bar	psi	Bar	psi	Bar
Welded 316L stainless steel bellows with 1/2" NPTF pressure connection
S126B		30 to 3" Hg Vac	-1 to 1,38	0.2 to 0.6" Hg		0,0007 to 0,02	3" Hg Vac	-0,10	30" Hg Vac & 5 psi	-1,02 & 0,34
S134B		30 Hg Vac to 20 psi	-1 to 1,38	0.2 to 0.6" Hg		0,0007 to 0,02	20	1,38	25	1,72
S137B		15 to 80"WC	0,04 to 0,19	2 to 6" WC		0,0005 to 0,015	80" WC	0,19	5	0,34
S144b		0.5 to 20	0,04 to 1,38	0.1 to 0.3		0,0007 to 0,021	20	1,38	25	1,72
S152B		1 to 50	0,07 to 3,45	0.1 to 0.5		0,0007 to 0,03	50	3,45	75	5,17
S156B		2 to 100	0,14 to 6,90	0.2 to 0.6		0,014 to 0,04	100	6,90	125	8,62
S164B		4 to 200	0,28 to 13,79	0.2 to 1		0,014 to 0,07	200	13,79	200	13,79
				Lower 75% range span	Top 25% range span	Lower 75% range span
Welded 316 stainless steel diaphragm with 1/2" NPTF pressure connection, 0.72"				psi	psi	Bar
190	9982	5 to 30	0,34 to 2,07	1 to 3	6 max	0,07 to 0,21	1500	103	2500	172
191	9994	10 to 100	0,69 to 6,90	1 to 8	15 max	0,07 to 0,55	1500	103	2500	172
192	95743	15 to 300	1,03 to 20,68	3 to 18	25 max	0,21 to 1,24	1500	103	2500	172
193	9995	20 to 500	1,38 to 34,48	4 to 30	45 max	0,28 to 2,07	1500	103	2500	172
194	9998	80 to 1700	5,52 to 117	5 to 120	150 max	0,34 to 8,27	2000	138	2500	172
303 stainless steel piston with Buna-N O-ring and 1/4" NPTF pressure connection (not recommended for gas service since drying of the O-ring seal can allow bleeding of medium into the atmosphere)
612	9886	125 to 3000	8,62 to 206	40 to 250		2,76 to 17,24	6000	414	10000	689
616		700 to 5000	48,27 to 344	40 to 375		2,76 to 25,86	6000	414	10000	689
Buna-N diaphragm O-ring with 1/4" NPTF nickel plated brass pressure connection; Optional Viton diaphragm and O-ring available.
701	9956	1.5 to 30	0,10 to 2,07	1 to 2		0,07 to 0,14	500	34,48	1000	68,95
702		3 to 100	0,21 to 6,90	1 to 4		0,07 to 0,28	500	34,48	1000	68,95
703		9 to 300	0,62 to 20,68	1 to 5		0,07 to 0,34	500	34,48	1000	68,95
704		15 to 500	1,03 to 34,48	2 to 8		0,14 to 0,55	1500	103	2500	172
705		30 to 1000	2,07 to 68,95	3 to 20		0,21 to 1,38	1500	103	2500	172
706		100 to 1700	6,9 to 117	10 to 30		0,69 to 2,07	2000	137	2500	172

 

Types H121/H122
Model	Adjustable Set Point Range Low end of range on fall; High end of range on rise		Deadband			Proof Pressure		Dial Divisions
	psi	Bar	psi	Bar	psi	Bar	psi
Welded 316 stainless steel bellows with 1/2" NPTF pressure connection
S126B	30" Hg Vac to 0 psi	-1,02 to 0	0.2 to 0.9" Hg	0,007 to 0,03	30" Hg Vac & 5 psi	-1,02 7amp; 0,34	0.5" Hg
S134B	30" Hg Vac to 20 psi	-1,02 to 1,38	0.2 to 1.2" Hg	0,007 to 0,04	25	1,72	1" Hg & 0.5 psi
S137B	2 to 80" WC	0,005 to 0,19	2 to 10" WC	0,005 to 0,02	5	0,34	2" WC
S144B	0 to 20	0 to 1,38	0.1 to 0.5	0,007 to 0,03	25	1,72	0.5
S146B	0 to 30	0 to 2,07	0.1 to 0.6	0,007 to 0,04	40	2,76	0.5
S156B	0 to 100	0 to 6,90	0.2 to 0.8	0,014 to 0,06	125	8,62	2
S164B	0 to 200	0 to 13,79	0.3 to 2	0,021 to 0,14	200	13,79	5
Buna-N diaphragm, O-ring with 1/4" NPTF nickel plated brass pressure connection; Optional Viton diaphragm O-ring available models 701-703
701	3 to 30	0,21 to 2,07	1 to 3	0,07 to 0,1	1000	68,95	0.5"
702	10 to 100	0,69 to 6,90	1 to 5	0,07 to 0,17	1000	68,95	2
703	30 to 300	2,07 to 20,69	2 to 7	0,14 to 0,02	1000	68,95	10
704	50 to 500	3,45 to 34,48	3 to 12	0,21 to 0,83	2500	172	10
705	200 to 1000	13,79 to 68,95	5 to 25	0,34 to 1,38	2500	172	25

Differential Pressure Model Charts

Type J120K
Model	Adjustable Set Point Range Low end of range on fall; High end of range on rise		Deadband			Working Pressure		Proof Pressure
	psid	Bar	psi	Bar	psi	Bar	psi	Bar
316 stainless steel bellows with 1/2" NPTF pressure connection
S147B	3 to 30	0,21 to 2,07
S157B	10 to 100	0,69 to 6,90
Buna-N diaphragm , O-ring with 1/4" NPTF 303 stainless steel pressure connection
36	3 to 30	0,21 to 2,07	1 to 5	0,07 to 0,34	0 to 350	0 to 24,13	1000	68,95
37	10 to 100	0,69 to 6,90	2 to 8	0,14 to 0,56	0 to 500	0 to 34,48	1000	68,95
38	30 to 300	2,07 to 20,69	2 to 15	0,14 to 1,05	0 to 1000	0 to 68,95	2500	172
39	50 to 500	3,45 to 34,48	3 to 20	0,21 to 1,40	0 to 1000	0 to 68,95	2500	172
Buna-N diaphragm, O-ring with 1/4" NPTF aluminum pressure connection
455	5 to 80" WCD	0,005 to 0,20	1 to 4" WC	0,002 to 0,01	30" Hg Vac to 255 psi	-1 to 15,52	225	15,51
456	2 to 20	0,01 to 1,38	0.05 to 0.2	0,03 to 0,01	30" Hg Vac to 255 psi	-1 to 15,51	225	15,51
457	3 to 30	0,02 to 2,07	0.05 to 0.3	0,03 to 0,02	30" Hg Vac to 255 psi	-1 to 15,51	225	15,51

Temperature Model Charts

Model	Adjustable Set Point Range		Max. Temp.		Scale Div.		Stem Size/Finish
	°F	°C	°F	°C	°F	°C	OD x Length
Types B121/B122/C120
120	0 to 255	-17.7 to 105	275	135	5	3	9/16" x 1 7/8" Below Thread Nickel Plated Brass Std length only
121	200 to 425	95 to 215	475	245	5	3	9/16" x 1 7/8" Below Thread Nickel Plated Brass Std length only
HTFP (Freeze Protection)	15 to 140	-10 to 60	160	71			9/16" x 2 11/16" Below head Stainless steel
Types E121/E122
2BSA	-120 to 100	-85 to 35	150	65	5	3	3/8 x 2 5/8"
2BSB	30 to 250	0 to 120	300	150	5	5	3/8 x 2 5/8"
3BS	100 to 400	35 to 200	450	230	5	5	3/8 x 2 1/8"
4BS	25 to 100	-5 to 35	150	65	2	1	3/8 x 6 3/4"
5BS	-20 to 80	-30 to 25	130	55	2	2	3/8 x 5"
8BS	350 to 640	175 to 335	690	365	5	5	3/8 x 3 1/4"
HTFP (Heat Tracing)	25 to 325	-5 to 163	360	182			1/4 x 10 1/4"
Type F120
1BS	-180 to 120	-115 to 50	170	75			3/8 x 3 3/4"
2BS	-125 to 350	-85 to 175	400	200			3/8 x 2 5/8"
3BS	-125 to 500	-85 to 260	550	285			3/8 x 2 1/8"
4BS	-40 to 120	-40 to 50	170	75			3/8 x 6 3/4"
5BS	-40 to 180	-40 to 80	230	110			3/8 x 5"
6BS	0 to 250	-17.7 to 120	300	145			3/8 x 4 1/2"
7BS	0 to 400	-17.7 to 200	450	230			3/8 x 3"
8BS	50 to 650	10 to 340	700	370			3/8 x 3 1/4"

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Options

Many switch and sensor options are available.
Request a copy of our Process Measurement and Control Catalog for a complete list of availability.