11
Series 275 Convectron Gauge Bridge Amp PC Board
Instruction Manual - 275331
Chapter 2
2
Specifications
2.1 General Specifications
• Do not use the Convectron Gauge or control electronics in an area of high vibration, extreme
shock, or an environment that e50 °C during operation.
• Do not use the Convectron Gauge to measure pressures of explosive gases.
• Always be sure that all components of the vacuum system are properly grounded.
2.2 Convectron Gauge Tube Construction
All materials are compatible for ultra high vacuum service, corrosion resistance and bakeability to
150 °C. The gauge tube envelope is type 304 stainless steel. All metallic joints in the envelope are
welded. No solder is used within the envelope. The following materials are exposed to the vacuum:
Type 304 stainless steel, Carpenter Alloy 52, Kovar, Kapton
®
, gold-plated Tungsten, and borosilicate
glass.
Table 2-1
Specifications
Function
Description
System
Measuring range for Air or N
2
(
See the Operation Chapter of this
instruction manual for correction
curves for other gases.
)
1 mTorr to 1000 Torr N
2
or equivalent
Resolution
1 x 10
-4
Torr
Bridge Amplifier PC Board
Power required
+12 Vdc, 200 mA max
Connector
15-pin "D" connector
Ambient operating temperature
range
+15 °C to +50 °C (+59 °F to +122 °F)
Non-operating temperature range
-40 °C to +70 (-40 °F to 158 °F)
Dimensions
2.47 x 3.00 inches. See Figure 2-2.
Analog (Recorder) output voltage
0 to 9 volts, +5%, +0.05 v, non-linear, monotonically increasing with
pressure. See Section 4.6 in the Operation Chapter.
Convectron Gauge
Gauge tube internal volume
40 cc (2.5 cu in.)
Weight
340 gm (12 oz) with 1/8 NPT fitting
Sensor wire
Gold-plated Tungsten
Gauge mounting position
Horizontal preferred. See Figure 3-1.
Gauge tube temperature
compensation range
+15 to +50 °C (+59 °F to +122 °F)
Bakeout temperature (non-operating)
+150 °C max. (+302 °F)