nAPG series Digital Active Pirani vacuum gauges are available in two models. The nAPG-M is the standard model and measures from atmosphere to 10-3 mbar, the nAPG-LC is a corrosion resistant version with measurement from atmosphere to 10-4 mbar.

Features and benefits

  • Wide-range supply voltage allows operation from 15 to 48 V DC.
  • Gauge naming allows user to store gauge identification data.
  • Sensor tube can be baked to 150°C.
  • Adjustable open collector set-point output for simple process control and interlocking.
  • NW16 flange for easy connection to vacuum systems - NW25 flange options on request
  • Serial communications based on a simple ASCII, low latency, query and command protocol that can operated in a point to point or multi-drop system with minimum overhead.
  • Remote calibration possible
  • Cable connections and gauge adjustment conveniently located, thereby minimising the space envelope required for access.
  • CSA and C/US approved, meets the safety requirements for electrical equipment for measurement.
  • RS485 or RS232 versions.
  • 9600 to 38400 baud, 8bits, 1 start bit, 1 stop bit, no parity
Technical data  
NW16 version 0,85 kg
Internal volume 5 cm3
Enclosure rating IP40
Measurement range

nAPG-M atmosphere to 10-3 mbar

nAPG-L atmosphere to 10-4 mbar


nAPG-M Typically

nAPG-LC Typically


±15% at <100 mbar

±15% at <10 mbar

Temperature range



Bake-out with electronics removed


5 to 60°C

30 to 70°C



80% RH up to 31°C decreasing linearly to 50% RH at 40°C and above

Maximum altitude

3000 m

Filament temperature

100°C above ambient

Electrical supply voltage

15 to 48 V DC nominal

Power consumption

1 W


open collector transistor


48 V DC 100 mA