About NOSHOK
Precision Process Measurement & Control Instrumentation
NOSHOK, Inc. is a leading manufacturer of pressure, level, and temperature measurement instrumentation and process control devices, serving diverse industries including oil & gas, fluid power, power generation, general manufacturing, automation, chemical processing, water & wastewater, food & beverage, marine, and pharmaceuticals. The company combines decades of metrology expertise with rapid customization capabilities to deliver accurate, reliable sensing solutions for mission-critical applications.
The NOSHOK product portfolio includes pressure transmitters and transducers (gauge, compound, absolute, and vacuum ranges up to 10,000 PSI), temperature sensing elements (RTDs, thermocouples, bimetal), pressure and temperature switches with adjustable setpoints, level transmitters for tank inventory management, diaphragm seals for isolation and remote sensing, and specialized instruments for marine, aerospace, and hazardous locations.
Key product lines include the PT40 series (high-accuracy fixed-range pressure transmitters), PT30 series (compact high-performance fixed-range devices), the 660 series (micro-size transducers with ±0.25% accuracy), and intelligent IO-Link transmitters (PTI10/PTI15) with on-board diagnostics and remote configuration. Output options span 4–20mA analog, 0–10V, digital bus protocols (Modbus, CANopen), and pulse outputs.
All NOSHOK instruments are engineered to operate reliably in demanding environments—HVAC systems, hydraulic power units, power plants, water treatment, marine vessels, and data-center cooling loops. Instruments carry UL, CSA, and European CE certifications for safety-critical applications.
ChatMRO connects process engineers, facility managers, and instrumentation technicians instantly with the right NOSHOK measurement device—specify your process variable (pressure/level/temperature), required accuracy, output protocol, and operating environment, and our AI surfaces compatible sensor models with calibration certificates and lead times from our indexed 30M+ component database.
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Frequently asked questions
What's the difference between gauge, absolute, and compound pressure ranges?
Gauge pressure measures relative to atmospheric pressure (0 PSI gauge = 14.7 PSIA at sea level). Absolute pressure measures relative to perfect vacuum (0 PSIA = hardest vacuum possible). Compound gauges measure both positive pressure and vacuum (e.g., -15 to +30 PSI gauge). Choose gauge for most industrial applications; absolute for aviation/altitude; compound for vacuum pump or refrigeration system monitoring.
Why should I use a diaphragm seal in a hydraulic pressure measurement application?
Diaphragm seals isolate the transducer from direct fluid contact, protecting internal electronics from oil degradation and allowing remote mounting away from harsh heat/vibration. The seal transmits pressure via capillary tube to the transducer located in a safer location. This extends instrument life and improves reliability in dirty or high-temperature hydraulic systems.
What accuracy class (±0.5%, ±1.0%, ±2.0%) should I specify for my process?
Accuracy depends on process criticality. HVAC systems tolerate ±2.0%; general industrial manufacturing needs ±1.0%; precision hydraulic servo systems require ±0.5% or better. Tighter accuracy costs more but ensures process stability and reduces tuning complexity. Consult your system control algorithm requirements before selecting—over-specifying adds unnecessary cost.
Can I use a pressure transmitter with a 0–500 PSI range to measure 100 PSI continuously?
Yes, but you'll lose output resolution—your 4–20mA output span becomes 4.82–5.63mA (narrow window). Better practice: select a transmitter with a 0–150 PSI range, giving 4.96–19.9mA output span and much better control loop responsiveness. Match the transducer range closely to your typical operating point for optimal control performance.
How do I perform a zero and span calibration check on a NOSHOK transmitter?
Most analog 4–20mA transmitters have field-adjustable potentiometers—apply known zero pressure (atmospheric for gauge range) and adjust zero pot until output reads exactly 4.00mA. Then apply maximum range pressure and adjust span pot until output reads exactly 20.00mA. Intelligent IO-Link transmitters simplify this via digital configuration software. Consult your specific model's instruction manual for procedure.