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300 Series Industrial Type Bimetal Thermometers with External Reset

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Application Brochures
Water/
Wastewater
  • Highest quality thermometers available on the market
  • Easy to calibrate with 1/16" Allen key
  • Corrosion-resistant 304 Stainless Steel case and bezel provide a hermetic seal to prevent lens fogging and moisture damage
  • Single °F, single °C, and dual scale options available
  • Accuracy: ±1% full scale, Grade A, ASME B40.3
  • 2", 3" and 5" sizes - center back and bottom connections
  • 2" Dial Size - 1/4" NPT; 3" & 5 " Dial Sizes - 1/2" NPT
  • Standard stem lengths 2-1/2" through 42"
  • Minimum or maximum indicating pointers are available in 3" and 5" sizes
  • Highly sensitive bimetallic helix coil is heat-treated for stress relief, and silicone-coated to minimize pointer vibration and maximize heat transfer and response time
  • 360° groove around stem is a visual reference to show minimum immersion point
  • Made in the U.S.A.

     Note: Thermowells are recommended for pressure, corrosive fluids and high velocity applications.

If you are viewing on a smaller screen or with screen zoom, please use the horizontal scroll bar at the bottom of this table to see all information.

DIAL SIZES 20 2" (Back connected only) 30 3" 50 5"
CASE TYPES 300 Bottom connection 310 Back connection 320 Adjustable angle connection**
STEM LENGTHS 025 2-1/2" 120 12" 300 30"
040 4" 150 15" 360 36"
060 6" 180 18" 420 42"
090 9" 240 24"   Available up to 120"
TEMPERATURE RANGES
Dual Scale °F/°C
-100/100 F/C -100 °F/C to 100 °F/C 0/250 F/C 0 °F/C to 250 °F/C 50/500 F/C 50 °F/C to 500 °F/C
-40/160 F/C -40 °F/C to 160 °F/C 20/240 F/C 20 °F/C to 240 °F/C 150/750 F/C 150 °F/C to 750 °F/C
0/140 F/C 0 °F/C to 140 °F/C 25/125 F/C 25 °F/C to 125 °F/C 200/1000 F/C 200 °F/C to 1,000 °F/C*
0/180 F/C 0 °F/C to 180 °F/C 50/300 F/C 50 °F/C to 300 °F/C    
0/220 F/C 0 °F/C to 220 °F/C 50/400 F/C 50 °F/C to 400 °F/C    
Single Scale °F -100/100 F -100 °F to 100 °F 0/300 F 0 °F to 300 °F** 50/550 F 50 °F to 550 °F
-50/120 F -50 °F to 120 °F 0/500 F 0 °F to 500 °F** 100/800 F 100 °F to 800 °F**
-40/160 F -40 °F to 160 °F 20/240 F 20 °F to 240 °F 150/750 F 150 °F to 750 °F
0/140 F 0 °F to 140 °F 25/125 F 25 °F to 125 °F 200/1000 F 200 °F to 1,000 °F*
0/180 F 0 °F to 180 °F 50/250 F 50 °F to 250 °F    
0/200 F 0 °F to 200 °F 50/300 F 50 °F to 300 °F    
0/220 F 0 °F to 220 °F 50/400 F 50 °F to 400 °F    
0/250 F 0 °F to 250 °F 50/500 F 50 °F to 500 °F    
Single Scale °C -75/175 C -75 °C to 175 °C 0/50 C 0 °C to 50 °C 0/300 C 0 °C to 300 °C
-70/70 C -70 °C to 70 °C** 0/60 C 0 °C to 60 °C** 0/400 C 0 °C to 400 °C
-50/100 C -50 °C to 100 °C** 0/80 C 0 °C to 80 °C** 0/450 C 0 °C to 450 °C
-50/50 C -50 °C to 50 °C 0/100 C 0 °C to 100 °C 100/400 C 100 °C to 400 °C
-30/50 C -30 °C to 50 °C 0/150 C 0 °C to 150 °C 100/550 C 100 °C to 550 °C*
-40/70 C -40 °C to 70 °C 0/200 C 0 °C to 200 °C    
-20/120 C -20 °C to 120 °C** 0/250 C 0 °C to 250 °C    
-10/110 C -10 °C to 110 °C**        
  Consult factory for additional temperature ranges      
OPTIONS 6 6 mm stem diameter** HD Heavy-Duty Stem (0.375" Dia.)** SD Safety Glass Lens**
8 8 mm stem diameter** LL Polycarbonate Lens SL Silicone Filled †††
316 316 SS Connection & Stem** MIP Maximum Indicating Pointer*** ST Stainless Steel Tagging
AU 1/2" NPT Adjustable Union** MIP2 Min and Max Indicating Pointers*** TG Tempered Glass Lens††
GD Glow Dial PL Acrylic Lens    

Note: All 316 Stainless Steel construction (case, bezel, wetted parts) is available. Please consult factory.

* Thermometers with temperature ranges 200/1000 °F and 100/500 °C are not recommended for continuous use above 800 °F/425 °C. For intermittent use only.
** Available for 3" and 5" dial sizes only.
*** Available only on 30-310 and 50-310 models.
† Available only on 50-320 model. Includes reflective pointer and two reflective clips.
†† Not available with Silicone Filled (SL) option.
††† Available only for ranges from -50 °F (-45 °C) to 500 °F (260 °C). Polycarbonate lens is standard with Silicone Fill.

If you are viewing on a smaller screen or with screen zoom, please use the horizontal scroll bar at the bottom of this table to see all information.

  MODELS SPECIFICATIONS
Case & Bezel All 300 Series 304 Stainless Steel; 316 Stainless Steel optional
Lens All 300 Series Instrument glass
Pointer All 300 Series Aluminum, black finished
Stem diameter All 300 Series 0.250" (6.35 mm)
Accuracy All 300 Series ±1% full scale, Grade A, ASME B40.3
Dial All 300 Series Anodized Aluminum with large black numbers and graduations
Process connection 2" Dial Size
3" & 5" Dial Size
1/4" NPT
1/2" NPT
Wetted parts All 300 Series 304 Stainless Steel; 316 Stainless Steel optional
Hermetic seal All 300 Series Per ASME B40.3 dustproof and leakproof
Bimetal coil All 300 Series Silicone coated helix coil on ranges below 500 °F for vibration dampening, maximum heat transfer and response time
Over temperature limits All 300 Series Up to 250 °F 100%; 250 °F to 500 °F 50%; 550 °F to 1,000 °F continuous use up to 800 °F; intermittent use over 800 °F
Recalibrator All 300 Series External reset
Adjustable
angle form
320 Series All Stainless Steel brackets with screws that loosen to allow 360° rotation of head and 180 ° adjustment of stem position

Options & Accessories

  • 1/2" NPT Adjustable Union (AU), available for 3" and 5" dial sizes only
  • 316 SS Connection & Stem, available for 3" and 5" dial sizes only
  • 6 mm stem diameter, available for 3" and 5" dial sizes only
  • 8 mm stem diameter, available for 3" and 5" dial sizes only
  • Acrylic Lens (PL)
  • Certificate of Conformance
  • Heavy-Duty Stem (0.375" Dia.), available for 3" and 5" dial sizes only
  • Mounting Brackets – Consult Factory
  • Polycarbonate Lens (LL), should not be used where case temperature exceeds 300 °F/150 °C
  • Safety Glass Lens (SG), available for 3" and 5" dial sizes only
  • Stainless Steel Tagging (ST)
  • Tempered Glass Lens (TG), not available with Silicone Filled (SL) option.
  • Can be used to reposition the dial face for better viewing
  • Also helpful when installing a thermometer where space is limited
  • Available only for ranges from -50 °F (-45 °C) to 500 °F (260 °C)
  • For applications where severe vibration may be a factor
  • Silicone dampens and lubricates the internal mechanism thus reducing pointer oscillation and premature wear
  • Maximum case temperature not to exceed 300 °F (150 °C)
  • Polycarbonate lens is standard with Silicone Fill
  • Various sizes and types of mounting flanges are available

WARNING: This product can expose you to chemicals including Nickel, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

  • Special ranges and dials with company names, company logos, part numbers, telephone numbers, or almost any custom layout is available
  • Certified calibration provides the user with a serial numbered thermometer along with a calibration sheet against a primary temperature standard
  • Traceable to the National Institute of Standards and Technology
  • Available only on 50-310 and 50-320 model allows up close daylight and/or distant night time viewing 5" Adjustable angle or back connect
  • Reflective Pointer
  • Two reflective clips included to indicate custom minimum and maximum limits  
  • The MIP2 allows you to view your minimum and maximum temperatures for visual clarification of safe operation
  • Available only on 30-310 and 50-310 model
  • The MIP allows you to view your minimum or maximum temperatures for visual clarification of safe operation
  • Available only on 30-310 and 50-310 models (MIP)
  • The 304 Series Stainless Steel stem is welded at the tip and case for hermetic seal
  • 1/4" (6.35 mm) diameter is standard for lengths up to 24" (609 mm)
  • 3/8" diameter, sharp tip options and optional 316SS wetted parts are also available

WARNING: This product can expose you to chemicals including Nickel, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

Thermowells allow a temperature instrument to be removed and replaced without shutting down and draining the process, and reduce the possibility of damage to the temperature instrument.

View NOSHOK Thermowells


WARNING: This product can expose you to chemicals including Nickel, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov