MKS Granville-Phillips Mini-Convectron 275 series - Torr

4 Operation
39
Series 275 Mini-Convectron Module with DeviceNet
Instruction Manual - 275563
4.9 Special Considerations for Convectron Gauge Use Below 10
-3
To rr
During a fast pumpdown from atmosphere, thermal effects will prevent the Convectron Gauge from
tracking pressure accurately below 10
-3
Torr. After waiting about 15 minutes, indications in the
10
-4
range will be valid and response will be rapid. Zero adjustment at vacuum may be performed
at this time (or sooner if readings in the 10
-4
range are not needed). In the 10
-4
Torr range, the
indication is resolved to about 0.1 milliTorr provided the instrument has been carefully zeroed at
vacuum. For accurate use in the 10
-4
range, zeroing should be repeated frequently.
Table 4-10 Data Values for Atmosphere Calibration
Altitude
in Feet
Altitude
in Meters
Pressure in
Torr for N
2
or Air
Pressure in
mbar for N
2
or Air
Pressure in
Pacal for N
2
or Air
Pressure in
Inches of
Mercury
* Data in REAL
Float Format
10000 3048 523 695 69502 20.58 00 C0 02 44
9000 2743 543 724 72394 21.37 00 C0 07 44
8000 2438 564 752 75193 22.20 00 00 0D 44
7000 2134 586 781 78126 23.07 00 80 12 44
6000 1829 609 812 81193 23.97 00 40 18 44
5000 1524 632 842 84259 24.88 00 00 1E 44
4000 1219 656 874 87459 25.82 00 00 24 44
3000 914 681 908 90792 26.81 00 40 2A 44
2000 610 707 942 94258 27.83 00 C0 30 44
1000 305 733 977 97725 28.85 00 40 37 44
Sea Level 0 760 1013 101325 29.92 00 00 3E 44
* The numbers shown in this column (i.e. 00 C0 02 44) are shown in reverse order.
Table 4-11 760 Torr Example
Parameter Service Class Instance REAL Data
Gain Adjust 4C
hex
31
hex
1 00 00 3E 44
(760 Torr)