Dial Size
202" (50 mm) - Back connection only
303" (80 mm)
505" (128 mm)
Product page
NOSHOK
300 Series Industrial Type Bimetal Thermometers with External Reset & Sanitary Options
The NOSHOK 300 Series Industrial Type Bimetal Thermometers represent the highest quality temperature indication instruments on the market. Featuring an external reset hex screw that allows on-site calibration using a simple 1/16" Allen wrench, these thermometers are built with a corrosion-resistant 304 Stainless Steel case and bezel providing an ASME B40.3 hermetic seal. Available in bottom connected (300), center back connected (310), and 360° all-angle adjustable (320) executions, with standard NPT or 3-A Sanitary Tri-Clamp® process connections and optional min/max tracking pointers.
Highest quality industrial thermometer with convenient external recalibration reset (1/16" Allen key)
Available in bottom connected (300), center back connected (310), and all-angle adjustable (320) case styles
Sanitary Tri-Clamp® (3/4" through 4") and 3-A authorized sanitary options with 316 Stainless Steel wetted parts
Accuracy: ±1% full scale (Grade A, ASME B40.3)
Ready for quotationShare your range, connection and case requirement.
Talk to ATHApplicationsIndustrial processes, chemical & petrochemical plants, food & beverage, dairy processing, pharmaceuticals, brewing, water & wastewater, and power generation
Dial sizes2" (20 - back only), 3" (30), 5" (50)
Case styles300 = Bottom connection; 310 = Back connection; 320 = All-Angle adjustable (360° head rotation, 180° stem tilt)
Accuracy±1% full scale, Grade A, ASME B40.3
Temperature ranges-100 °F to 1,000 °F (-75 °C to 550 °C) in dual °F/°C, single °F, and single °C scales
Stem lengthsStandard: 2-1/2" to 42" (up to 120"); Sanitary: 1.625", 2.5", 2.75", 4.5", 7.5", 10.5", 13.5", 16.5", 22.5"
Process connections1/4" NPT (2" size), 1/2" NPT (3" & 5" sizes), Sanitary Tri-Clamp® (3/4", 1-1/2", 2", 2-1/2", 3", 4")
Wetted materials304 Stainless Steel standard; 316 Stainless Steel optional (standard on Sanitary Tri-Clamp)
RecalibratorExternal reset slotted hex adjustment on back/side of case
Part number example30 - 310 - 060 - 0/140 F/C - LL
Technical data
Selection and ordering reference
Configure dial size, case configuration (bottom, back, all-angle), stem length, temperature range, process connection (NPT or Sanitary Tri-Clamp), and options for the NOSHOK 300 Series.
Dial sizes2", 3", 5"
Accuracy±1% full scale (ASME B40.3 Grade A)
Case stylesBottom (300), Back (310), All-Angle (320)
Connections1/4" NPT, 1/2" NPT, 3/4" to 4" Tri-Clamp®
RecalibratorExternal Reset Hex Screw
Ranges-100 °F to 1,000 °F (-75 °C to 550 °C)
Case Type
300Bottom connection with external reset
310Center back connection with external reset
320All-angle adjustable connection (360° rotation, 180° tilt)
Standard Stem Lengths
0252-1/2" (63.5 mm)
0404" (101.6 mm)
0606" (152.4 mm)
0909" (228.6 mm)
12012" (304.8 mm)
15015" (381.0 mm)
18018" (457.2 mm)
24024" (609.6 mm)
30030" (762.0 mm)
36036" (914.4 mm)
42042" (1066.8 mm)
Dual Scale Temperature Ranges (°F/°C)
-100/100 F/C-100 °F/°C to 100 °F/°C
-40/160 F/C-40 °F/°C to 160 °F/°C
0/140 F/C0 °F/°C to 140 °F/°C
0/180 F/C0 °F/°C to 180 °F/°C
0/220 F/C0 °F/°C to 220 °F/°C
0/250 F/C0 °F/°C to 250 °F/°C
20/240 F/C20 °F/°C to 240 °F/°C
25/125 F/C25 °F/°C to 125 °F/°C
50/300 F/C50 °F/°C to 300 °F/°C
50/400 F/C50 °F/°C to 400 °F/°C
50/500 F/C50 °F/°C to 500 °F/°C
150/750 F/C150 °F/°C to 750 °F/°C
200/1000 F/C200 °F/°C to 1,000 °F/°C
Process Connections
1/41/4" NPT male (2" model)
1/21/2" NPT male (3" & 5" models)
06SAN3/4" Sanitary Tri-Clamp® (316 SS)
12SAN1-1/2" Sanitary Tri-Clamp® (316 SS)
16SAN2" Sanitary Tri-Clamp® (316 SS)
20SAN2-1/2" Sanitary Tri-Clamp® (316 SS)
24SAN3" Sanitary Tri-Clamp® (316 SS)
32SAN4" Sanitary Tri-Clamp® (316 SS)
Options & Accessories
MIPMaximum indicating pointer (30 & 50 models)
MIP2Min and max indicating pointers (30 & 50 models)
GDGlow Dial with reflective pointer (50-320 model)
316316 Stainless Steel wetted parts
AU1/2" NPT Adjustable Union
SLSilicone liquid filled (-50°F to 500°F)
LLPolycarbonate lens
SDSafety glass lens
TGTempered glass lens
HDHeavy-duty stem (0.375" dia)
STStainless steel tagging
Part number example
30 - 310 - 060 - 0/140 F/C - LL
30Dial size3" (80 mm)
310Case typeBack conn w/ external reset
060Stem length6" (152.4 mm)
0/140 F/CTemperature range0 to 140 °F/°C dual scale
LLOptionPolycarbonate lens
Technical specifications
Accuracy±1% full scale, Grade A, ASME B40.3
Dial sizes2", 3", 5"
Case stylesBottom (300), Back (310), All-Angle (320); 304 SS (316 SS optional)
Connections1/4" NPT, 1/2" NPT, Sanitary Tri-Clamp® (3/4" to 4")
RecalibratorExternal Reset hex screw on rear/side of case
Temperature ranges-100 °F to 1,000 °F (-75 °C to 550 °C)
Operating notes
External reset allows easy on-site recalibration using a 1/16" Allen wrench.
All-Angle adjustable bracket (320) rotates 360° and pivots 180° for flexible installation.
Sanitary Tri-Clamp® models meet 3-A sanitary standards for food, dairy, and pharmaceutical use.
Product Description
The NOSHOK 300 Series provides industry-standard temperature measurement with an external reset slot that enables quick recalibration without opening the case or compromising the hermetic seal. The all-welded 304 stainless steel case and bezel protect against moisture ingress, chemical splash, and lens fogging.
The all-angle adjustable model (320) features a heavy-duty stainless steel swivel bracket that allows the dial to rotate 360° and tilt 180°, ensuring perfect visibility regardless of piping orientation. Sanitary Tri-Clamp® versions are 3-A authorized and built with electropolished 316 stainless steel for food, beverage, dairy, and biotechnology systems.
External recalibration screw allows precise calibration in seconds using a 1/16" Allen wrench
Adjustable angle form allows field positioning for maximum viewing convenience in complex piping
Sanitary Tri-Clamp® models meet strict 3-A sanitary standards for CIP/SIP sterilization
Peak-hold minimum and maximum indicating pointers (MIP / MIP2) capture critical process temperature excursions
Optional liquid silicone filling (SL) for extreme mechanical vibration environments
Ordering Information
Dial sizes20 = 2" (back only), 30 = 3", 50 = 5"
Case types300 = Bottom conn; 310 = Back conn; 320 = All-angle adjustable
Standard stem lengths025 = 2-1/2", 040 = 4", 060 = 6", 090 = 9", 120 = 12", 150 = 15", 180 = 18", 240 = 24", 300 = 30", 360 = 36", 420 = 42" (up to 120")
Sanitary stem lengths01625 = 1.625", 025 = 2.5", 0275 = 2.75", 045 = 4.5", 075 = 7.5", 105 = 10.5", 135 = 13.5", 165 = 16.5", 225 = 22.5"
Dual scale ranges (°F/°C)-100/100 F/C, -40/160 F/C, 0/140 F/C, 0/180 F/C, 0/220 F/C, 0/250 F/C, 20/240 F/C, 25/125 F/C, 50/300 F/C, 50/400 F/C, 50/500 F/C, 150/750 F/C, 200/1000 F/C
Single scale rangesSingle °F (-100/100 F to 200/1000 F) and Single °C (-75/175 C to 100/550 C)
Sanitary connections06SAN (3/4" Tri-Clamp), 12SAN (1-1/2"), 16SAN (2"), 20SAN (2-1/2"), 24SAN (3"), 32SAN (4")
Options & AccessoriesMIP (Max pointer), MIP2 (Min/Max pointer), GD (Glow Dial for 50-320), 316 (316 SS wetted parts), AU (1/2" NPT Adjustable Union), SL (Silicone fill), LL (Polycarbonate lens), SD (Safety glass), TG (Tempered glass), HD (Heavy-duty stem), ST (SS tagging)
Part Number Example
Standard example30 - 310 - 060 - 0/140 F/C - LL
Dial size30 = 3" (80.95 mm)
Case type310 = Back connection with external reset
Stem length060 = 6" (152.4 mm)
Temperature range0/140 F/C = 0 °F/°C to 140 °F/°C dual scale
OptionLL = Polycarbonate lens
Product Specifications
Accuracy±1% full scale, Grade A, ASME B40.3
Case & Bezel304 Stainless Steel (316 SS optional); hermetically sealed dustproof & leakproof
Stem diameter0.250" (6.35 mm) standard & 3/4" Sanitary; 0.375" (9.53 mm) on larger Sanitary models; 6 mm, 8 mm, HD optional
LensInstrument glass standard; Polycarbonate (LL), Acrylic (PL), Tempered glass (TG), Safety glass (SD) optional
Dial & PointerAnodized aluminum dial with UV-resistant graduations; balanced black aluminum pointer
Over-temperature limitsUp to 250°F: 100%; 250°F to 550°F: 50%; 550°F to 1,000°F: continuous to 800°F, intermittent over 800°F
Adjustable angle bracketAll stainless steel bracket with locking screws allowing 360° rotation and 180° inclination (320 model)
Operating Notes
The external recalibrator adjustment enables field zeroing against standard reference thermometers without disturbing case seal integrity.
For Sanitary Tri-Clamp installations, ensure proper gasket material and clamp torque per 3-A sanitary guidelines.
Thermowells are recommended for high pressure, abrasive, and corrosive process applications.
All-Angle adjustable design (320) eliminates the need to specify separate straight or 90° angle thermometers.
Glow Dial (GD) option available on 5" adjustable model incorporates luminescent dial and reflective pointers for dark environments.
Silicone filled models (SL) provide maximum vibration protection up to 300 °F (150 °C) case temperature.