The Edwards APG, is a Pirani vacuum gauge and gauge controller in a single compact unit. The measurement range of the APG-M and of the corrosion-resistant APG-MP is 100 to 1 x 10-3 mbar: the range of the APG-L is 10 to 1 x 10-4 mbar. All of the gauges will indicate pressures up to 1000 mbar at reduced accuracy. The APG requires a 20 to 36 V d.c. power supply: it has a 2 to 10 V d.c. analogue output which is related to pressure. The APG is compatible with all of the Edwards AGC’s (Active Gauge Controllers) and with the appropriate versions of the Edwards AGD’s (Active Gauge Displays). Alternatively, you can use an independent power supply for the APG and you can read the Edwards APG output signal with a voltmeter or an analogue- to-digital converter. \n \nAn 8-way electrical connector socket on the APG is used to connect the APG to your AGC, AGD or electrical supply and voltmeter. Electrical cables fitted with suitable connector plugs are available as accessories. A gauge identification signal is available on the electrical connector: this signal is used by Edwards AGC’s to identify which type of Active gauge is connected, that is one of the following types: \n

• APG-M/MP
  
• APG-L
  

\n

Pressure range
APG-M	Atmosphere to 10-3 mbar
APG-L	Atmosphere to 10-4 mbar
Maximum over pressure	6 bar absolute
Power supply	20 to 36 V dc (max 1 V ripple)
Power consumption	1.5 W max
Output signal	2 to 10 V dc
Adjustments	Set vacuum and set atmosphere
Set-point
Range of set-point	5% to 95% full-scale voltage
Fixed hysterisis	7% full-scale voltage
Level setting resolution	±2% full-scale voltage
Rating	40 V dc, 100mA max
Temperature range
Operating	5 to 60 °C
Storage	0 to 70 °C
Materials exposed to vacuum
Filament
APG-M, APG-L	Gold-coated tungsten
APG-MP	Platinum/rhodium (90/10)
Other materials	Aluminium HETF, nickel, fluoroelas- tomer, PTFE, stainless steel 316
Internal volume	NW: 6cm3 15mm O.D.: 10cm3
Weight
Aluminium	120g
Stainless steel	200g
Socket connector	8 way FCC68 compatible
Vacuum fitting tube	NW 16 or NW 25 or 15 mm O.D.
Standards
Electronic design	EN 61010-1
Electrical noise immunity	EN 50081-1, EN 50082-1
Flame-retardant casing	UL94