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14
of
30
Step
Range
5 Torr
greater than 100 Torr
0.5 Torr
10 Torr to 100 Torr
0.05 Torr
5 Torr to 10 Torr
0.02 Torr
1 Torr to 5 Torr
1 mTorr
100 mTorr to 1000 mTorr
0.1 mTorr
less than 100 mTorr
Capacitance Diaphragm Gauge
Appendix 3
shows
pressure d
isplay format for Torr / millibar and Pascal units
. Pressure readings
are reliable to approximately 0.05 % of full scale.
Display resolution is converted from torr to
millibar units in the respective pressure ranges.
Unit display will read OFF if gauge cable is
connected or disconnected. The display will also read OFF if the pressure gauge is out of range.
Display will read LO if system pressure is less than the lowest displayable value.
Display will
flash if pressure reading is greater than the full-scale value.
Control unit may become warm during operation; this is normal
Set Point Operation
The Terranova® 907 can be utilized for process control functions through the use of two
independent, programmable set points, SET POINT 1 and SET POINT 2, and corresponding
relays. Each set point has an adjustable activation (i.e. SET POINT LO) and deactivation
(i.e. SET POINT HI) pressure value that allows the user to modify the relay hysteresis. SET PT 1
HI and SET PT 1 LO correspond to SET POINT 1; SET PT 2 HI and SET PT 2 LO correspond to SET
POINT 2. Set point pressure values are adjusted via the front panel; relay output is accessible
through the INPUT / OUTPUT 15-pin D-sub connector port located in the back of the control
unit. See
Table 1
for relay pin configuration.
Each relay will independently activate once the pressure reading is less than its corresponding
SET POINT LO value. The relay will deactivate once the pressure reading is greater than its
corresponding SET POINT HI value. Relays will be disabled if set point value is OFF. The
Terranova® 907 will automatically increase the SET POINT HI value to the next pressure step
from the SET POINT LO value if SET POINT LO is adjusted greater than SET POINT HI and vice
versa. For example, if SET POINT HI is set to 100 Torr and SET POINT LO is set to 110 Torr, the
SET POINT HI value will automatically be adjusted to 115 Torr. See
Appendix 5
for relay use
with inductive or capacitive load switching.
