Hermetically Sealed Thermostats

28/28NP

219/219NP

237/237NP

374

440

These hermetically sealed thermostats can be supplied in temperature ranges up to 400 degrees F. with either normally closed or normally open contacts. The temperature differential is nominally 1 degree F.

Miniature Hermetically Sealed Thermostats

DR/DR-SS

PD-S/PD-SS

Optional Mounting Brackets

Available with either Normally Closed or Normally Open Contacts
Fast response and close control. Dependability, rugged construction, and long life.
Temperature range up to 200 C. Temperature differential 1 F.
Standard optional mounting brackets M; 00; V

Hermetically Sealed Thermostats, Bimetal Thermostats, Miniature, Capsule, Thermostats for industrial applications

MODEL 28/28NP

Is designed for rapid response to changes in surface temperature. The bimetal is mounted in intimate contact with a copper base providing optimum heat transfer. Satisfies military environmental specifications in many critical applications. Gold plating inhibits oxidation of the sensing surface. The adjustment screw is solder sealed in factory calibration. Mounting is with #4 screws for 2 holes at 1.031" centers. Weight is .216 oz. U.S. Patent No. 2.991.341. Supplied with a tin finish as the MODEL 28NP which has its adjustment screw glyptal or solder sealed.
SIZE: 1-5/16" L. x .400" W x 9/16" H.
RATING: 5A. 115 V.A.C. or 28 VD.C.

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Hermetically sealed thermostate Model 219

MODEL 219/219NP

Has identical construction to the model 28 with exception of the copper right angle mounting bracket This bracket reduces the mounting height by 7/32" without sacrificing the rapid thermal response of the Model 28. Gold plating is standard Provided with 4 mounting holes having .125" diameters and 1.000" centers. Weight is .264 oz. Designated as the MODEL 219NP with a tin finish.
SIZE: 1-5/16" L. x .375" W x 9/16" H.
RATING: 5A. 115 VAC. or 28 VD.C.

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hermetically sealed thermostat model 237

MODEL 237

Has identical construction to the Model 28 except that the copper mounting base is circular. Gold plating is standard. Provided with 2 mounting holes with 7/64" diameters and .578" centers. Designated as the MODEL 237NP with a tin finish.
SIZE: 3/4" diameter x 9/16" H.
RATING: 5A. 115 VA.C. or 28 VD.C.

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hermetically sealed thermostat model 374

MODEL 374

Has a stainless steel tubular probe for immersion applications. Its 3-element switch construction is identical to the Model 28. Tin finish is standard. Supplied with a standard 1/8" NPT stainless steel fitting. The probe is 1/4" diameter by 1-11/16" long.
SIZE: 2-25/32" L x 7/8" W
RATING: 5A. 115 V.A.C. or 28 V.D.C.

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hermetically sealed thermostat model 440

MODEL 440

Operates on the principle of thermal differential expansion between two dissimilar metals. The stainless steel thermal probe is 1/4" diameter by 1-23/32" long. It is supplied with 1/8" NPT or a 7/16"-20 UNF stainless steel fitting. Contact arrangement is normally closed only. Designed for critical military and aerospace applications. Tin finish is standard.
SIZE: 2-27/32" L.x 7/8" W
RATING: 5A. 115 V.A.C. or 28 V.A.C.

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MODEL DR/DR-SS

Is our smallest thermostat which has the bimetal-actuated contact insulated from the case by two glass seal solder terminals. The DR-SS incorporates a contact spring to shunt the load current from the bimetal.
Size: 1/4" dia. x .970" L.
Rating: 1 A. 115 V.A.C. (DR), 1-1/2 A. 115 V.A.C. (DR-SS) 3 A. 28 V.D.C.*

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MODEL PD-S/PD-SS

Is our smallest thermostat which has a grounded case and one glass seal solder terminal. The PD-SS incorporates a contact spring to shunt the load current from the bimetal.
Size: 1/4" dia. x .970" L.
Rating: 1 A. 115 V.A.C. (PD-S), 1-1/2 A. 115 V.A.C.(PD-SS) 3A. 28V.D.C.*

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MODEL BW

Has a bimetal-actuated contact insulated from the case by two glass seal solder terminals and a glass insulated tipped adjustment screw. The BW-SS incorporates a contact spring to shunt the load current from the bimetal.
Size: 1/4" dia. x 1.750" L.
Rating: 1 A. 115 V.A.C. (BW), 1-1/2 A. 115 V.A.C. (BW-SS) 3 A. 28 V.D.C.*

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MODEL BA

Has one glass seal solder terminal, and a solder terminal for the grounded case.
Size: 1/4" dia. x 1.250" L.
Rating: 1 A. 115 V.A.C. or 3 A. 28 V.D.C.*

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MODEL WP

Has our smallest available diameter of 3/16", with a grounded case, one glass seal solder terminal, and a maximum differential of 1 degree C.
Size: 3/16" dia. x .925"
Rating: 3/4 A. 28 V.D.C.*

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Hermetically sealed thermostat model SE

MODEL SE

Is a miniature immersion thermostat supplied with either a 1/8" or 1/4" NPT stainless steel thermowell. It can be supplied in either hermetically sealed or non-hermetically sealed versions. Its differential is 1 degree C maximum.
Size: 1/8" NPT .325" dia. x .750" L. of probe; 1/4" NPT .350" dia. x .950" L. of probe
Rating: 1 A. 115 V.A.C. or 3 A. 28 V.D.C.*

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OPTIONAL MOUNTING BRACKETS


M Bracket Has a .128" diameter hole.	OO Bracket Has two mounting holes with .125" x .312" slots with .750" center.	V Bracket Has two .113" diameter holes with 1" centers.

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