2.5
Analog Outputs
2
SETUP
2.5.2
4A Thermocouple Convection Sensor
The 4A Thermocouple Convection sensor has two standard analog output formats and possesses a
third optional analog output format. The Traditional Output option mimics the output of the raw signal
from the 4A sensor. The voltage can be converted to a pressure by using a linear interpolation table.
To receive an MC300 with a 4A sensor analog output set to Traditional, the user must specify this
change during ordering.
The Linear Output option provides a linear signal from .001 Torr to 1 Torr. The voltage can be converted
to a pressure via an equation. The Linear Output is included in standard units.
Pr essr e
(
Tor r
) =
V
(
Vots
)
×
.
1
(2)
The Linear by Decade Output option provides a signal that is linear within each decade (power of
ten) and uses the first digit to convey the decade of pressure. The signal can be converted to a
pressure by using a function to parse the voltage measurement. The Linear by Decade Output is
included in standard units.
For V
=
NT.DDD
Pr essr e
(
Tor r
) =
0
.DDD
×
10
(
NT
−
6
)
(3)
Figure 4: 4A Analog Output
email: sales@frederickscompany.com
tel: +1 215 947 2500
web: frederickscompany.com
mc300_im rev H
11 of 23
