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149-072011 Model 2002 Vacuum Gauge Page 5 of 38
board is also available. The Model 2002 instrument accepts an external TTL level "Remote Zero" to zero
the instrument when another instrument (e.g. an ion gauge) indicates that the pressure is less than 1x10-5
Torr. The standard analog output is linear per decade directly corresponding to the control unit’s display.
The Model 2002 comes calibrated for nitrogen. Conversion factors for other gases are selectable by the user
(see section 3.5). This direct readout display allows for flexibility in user system configurations which
operate with various gases.
An optional serial interface board can be installed to provide RS232 or RS485 support. The Model 2002
control unit fits a standard DIN 43700 insert (1/4 DIN) and mounts into a 3.62 in. (92 mm) square hole.
The case is constructed of NORYL rated UL-94-V1 (self-extinguishing plastic) and is equipped with
mounting brackets that are adjustable up to 3/16” (4.8mm).
1.4. Specifications
Measuring range .................................................................................................................. 1x10
-4
to 10
+3
Torr
....................................................................................................................................1.3x10
-4
to 1.3x10
+3
mbar
Accuracy (N2, T=230C) ..................................................................+ 20% of reading (5x10
-4
to 5x10
+1
Torr)
......................................................................................................... + 1.5% of reading (5x10
+1
to 1x10
+3
Torr)
Ambient temperature operating range ............................................................................................... 0
0
to 50
0
C
Bakeout temperature (with transducer electronics removed)....................................................................250
0
C
Analog output.................................................................................. 1.0-4.5 Volts (0.5 VDC linear per decade)
Process control ...................................................................................2 TTL outputs (1 TTL auto zero input)
Digital readout......................................................... four green LED - resolution is three digit (plus exponent)
Equipment operating range................................................................................. 120/240 V~, 0.25A, 50/60 Hz
.........................................................................................A 6 ft., 3-wire power cord is provided with each unit.
Fuse............................................................................................................................................... 250 V, 1/4 A.
Transducer mounting...................................................................................Any position without recalibration.
Transducer internal volume .....................................................................................................................<1.5cc
Wetted material .........................................................................................................Au, Si
3
N
4
, Si, Pt, Pyrex
TM
,
............................................................................................................................................Kovar
TM
and 316 SS
Stability with voltage ..................................................................................... Variation in reading undetectable
...................................................................................................as power fluctuates within power specification.
Weight (display, cable, and sensor)..................................................................Net: 2.5 lbs., Shipping: 3.4 lbs.
Transducer response time ...................................................................... typically, less than 150 msec for a step
....................................................................................................................change from 10
-3
Torr to 10
+3
Torr.
Positive pressure.................................................................................. 150 psig, Recalibration may be required
..................................................................... if unit is exposed to pressures greatly exceeding measuring range.