DigiVac DVG-6 사용 설명서 - 페이지 5
{카테고리_이름} DigiVac DVG-6에 대한 사용 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. DigiVac DVG-6 10 페이지. Wide range thermocouple vacuum gauges and controllers
페이지 인쇄
4.0
GAUGE TUBE INSTALLATION
The tube must be mounted in a stem down position within 10 degrees of vertical. Its
connection is one-eighth inch male pipe thread. Thread tape will make sealing easier. Be
careful not to twist the cable.
The tube should be installed in a clean part of the vacuum system. It is best not to mount it
directly on a vacuum pump suction as the tube life may be shortened by backstreaming of
pump oil vapors. Inserting a loop of tubing or an optical baffle is often helpful in protecting
the tube from backstreaming.
After energizing, the unit will initialize and operate. It reaches best thermocouple accuracy
after a few minutes of warm-up. For greater accuracy Digivac offers a combination
transducer/thermocouple gauge which offers 1% accuracy in Torr ranges. We also offer ¼%
accurate capacitance manometer gauges.
The gauges have a switching power supply that can be connected to either 115 or 220 VAC,
50/60 hz.
The relay outputs of the Model 200P should be connected at this time if they are to be
used. The connection positions are marked on the terminal strip. Note: not all 200P units
have control outputs. All terminal strips have markings. The outputs are SPDT, 250 VAC, 7
amps. If the contacts are switching highly inductive loads, varistors or other transient
protective components may be required. The normally open contacts close when the
vacuum setpoint is reached.
At atmosphere, the unit will read 760. A visible decimal point indicates that the unit is
reading in Torr. As pressures are decreased, the unit's readings will shift to 99.0, 9.99,
.999 , and finally to .001 One micron is equal to one millitorr.
The reading of the gauge will be influenced by the composition of the gasses remaining.
All wide range and Piriani vacuum gauges are subject to this phenomenon. For applications
in which excellent accuracy is required in the low torr ranges, such as the filling of neon
and laser tubes, we offer a transducer-based guage which gives precise readings regardless
of gas composition. Transducer gauges are not able to read in the micron ranges.
Representative readings are as follows:
Note: The Digivac Model 100W, preferred by many in the refrigeration industry, reads
directly in microns.
Torr
760.
550.
120.
99.0
12.3
10.0
9.90
1.23
.999
.555
.123
.055
.001
millitorr or microns
760,000
550,000
120,000
99,000
12,300
10,000
9,900
1,230
999
555
123
55
1
5