Filter
Top Products
Model 2002 page 19
4.3 4.3
4.3 4.3
4.3
TTL OutputsTTL Outputs
TTL OutputsTTL Outputs
TTL Outputs
TTL outputs are provided for process control. High and Low set points are entered on the front panel
(see Section 3.4) and TTL signals are generated on the I/O cable in the following manner:
1) When the pressure as indicated by the Model 2002 is above the High set point, the High
signal line (pin #3) will be set to a TTL high level (+5 VDC). When the indicated pressure
is below the High set point, the High signal line (pin#3) will be set to a TTL low level (+0 VDC).
2) When the pressure as indicated by the Model 2002 is below the Low set point, the Low signal
line (pin #4) will be set to a TTL high level (+5 VDC). When the indicated pressure is above
the Low set point, the Low signal line (pin #4) will be set to a TTL low level (+0 VDC).
These TTL signals are used for a variety of applications. With these signals, the user has the capability
to turn off/on various equipment such as valves, flow controllers, pumps, heaters, and safety equipment.
Figure 4.1
MODEL 2002 MODEL 2002
MODEL 2002 MODEL 2002
MODEL 2002
Analog OutputAnalog Output
Analog OutputAnalog Output
Analog Output
VDC (volts) -vs- Pressure (Torr)
2.5
2.4
2.3
2.2
2.1
2.0
12345678910
X 10
-2
Torr
0.5 VDC Linear per Decade
VDC
4.5
4.0
3.5
2.5
3.0
2.0
1.5
1.0
0.5
0.0
1.0E-5 1.0E-4 1.0E-3 1.0E-2 1.0E-1 1.0E+0 1.0E+1 1.0E+2 1.0E+3
Pressure (Torr)
VDC