Vacuum Measurement and control systems - Edwards (formely known as BOC Edwards) vacuum guages

APGX Active PIRANI Gauges Atmosphere to 10^-4 mbar

The new Edwards (formerly known as BOC Edwards) Linear Pirani Gauges (APGX) are based on proven Pirani technology. The new gauge has however been engineered to provide 1 volt per decade log/linear output, together with very simple push button controls, a second set point and error diagnostics. The gauge is particularly suitable for direct integration into OEM systems, requiring no look-up tables, merely the inclusion of a simple formula for interpretation of the guage output.

Features and Benefits

• Integral electronics with 1 volt per decade linear output allows stand-alone operation and makes for easy integration into OEM control systems, with up to 100m cable runs

• New diagnostics facility enables gauge to report broken filament, out of range and calibration errors

• Two easy to use, push button adjustable set points, for process control and/or diagnostics reporting

• Single pushbutton switch sets both atmosphere and vacuum

• Innovative eletronics design enables compliance with low emission and high immunity EMC standards

• Medium and low pressure versions available

• Corrosion resistant versions available

• Choice of Stainless Steel or Aluminium gauge tubes with a selection of vacuum fittings and filament materials to suit your application

Technical specification

Pressure range:

APGX-L Atmosphere to 10^-4 mbar/Torr

APGX-M & APGX-MP Atmosphere to 10^-3 mbar/Torr

APGX-L Typically ±15% of reading at <10mbar/Torr

APGX-M & APGX-MP Typically ±15% of reading at <100mbar/Torr

Maximum overpressure: 10 bar absolute (145 psi)

Power Supply: +14.5 to +36 V d.c. (max 1 V ripple)

Power consumption: 1.5 W max

(M and MP version)

2.0 W max (L version)
Output signal:

APGX-L 2.0 to 9.0 V d.c. In range

1000 to 10^-4 mbar

APGX-M & APGX-MP

3.0 to 9.0 V d.c. in range
1000 to 10^-3 mbar/Torr

Diagnostics:

Under range: 1.9V

Over range: 9.1V

Broken fillament: 9.5V

Calibration error: 9.6V

Adjustments Set vacuum and set atmosphere

Set point: (2 of): Open collector transister

Range of set point: Full pressure measurement on gauge

Fixed hysteresis: 0.5V (½ decade)

Rating: 40 V d.c 100mA max

Temperature range:

Operating temperature: +5 to +55 ºC

Storage temperature: -30 to +70 ºC

Materials exposed to vacuum

Aluminium tube: Aluminium, Nickel, PTFE, Fluoroelastomer

Stainless steel tube: St St 316L, Nickel, PTFE, Fluoroelastomer

Filament:

APGX-L and APGX-M Gold coated tungsten

APGX-MP Platinum/Rhodium (90/10)

Internal volume: NW: 6 cm³

Weight:

Aluminium: 0.12kg

Stainless Steel: 0.2kg

External interface connector: 8 way FCC68(RJ45) socket

Vacuum Fitting: NW16, NW25 or 15mm O.D.

Standards

Electronic design: BS EN 61010-1

Eletromagnetic compatibilityL EN 61326 Industrial Location, Class B emissions

Flame resistant casing: UL 94 (V0)

Enclosure rating: IP 40

Pin allocation

1. Supply positive

2. Supply common

3. Gauge output

4. Gauge indentification

5. Signal common

6. Set point 1 output

7. Remote calibration input

8. Set point 2 output

• Accuracy is reduced at the lower limit of the measuring range

Ordering information