TELEVAC MX7M, Инструкция по эксплуатации

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Instruction Manual MX7M Active Gauge
ˆ
Press UP and DOWN to change the value.
ˆ
When the desired reading is reached, press ENT to save the change or SEL to navigate away
without saving the change.
2.6.6 Output
The MX7M provides a user selectable analog output as well as RS-485 and USB digital outputs.
To modify the output settings:
ˆ
Navigate to the measurement screen.
ˆ
Press SEL five times.
ˆ
Press UP and DOWN to navigate between the analog output and RS-485 screens.
ˆ
When the desired field is present, press ENT to enter the heading.
ˆ
To change the desired setting, press ENT to unlock the setting.
ˆ
Press UP or DOWN to adjust the setting.
ˆ
Press ENT to save the setting or SEL to navigate away without saving.
A
.
Analog Output
The types of analog output are listed below. For more information on the types of output, please
see Section 2.7.
(a) Linear
i. 10V
ii. 0V (non-settable)
(b) Linear by Decade
(c) Linear by Decade 7F
(d) Logarithmic
i. 10V
ii. 0V
B
.
RS-485 Output
The RS-485 settable fields are listed below. Please see the Section 3 for more details and a
complete list of commands. Listed below are the fields within the RS-485 Output screen.
(a) Address
(b) Baud Rate
2.7 Analog Output
The MX7M provides the option for outputting the pressure reading in an analog form. Operators who
wish to use PLCs to monitor processes should find this function useful. There are four different analog
output formats to choose between. The formats include Logarithmic, Linear by Decade, Linear by
Decade 7F, and Linear.
A
.
Linear
The Linear output covers a select range of the MX7M with a linear scale. The 10 Volt or full-scale
value of the output can be selected from the following values: 1
× 10
−
5
Torr, 1 × 10
−
4
Torr, or
1 × 10
−
3
Torr. The scale extends three decades below the full-scale value. Three decades below
the 10 V value is the 0 V value. This corresponds to the low end of the range and output below
the 0 V value is not available. For a wider range use a different analog output formate. Note
that only the 10 V exponent is selectable. When navigating through the menu, the 0 V exponent
will be viewable but not settable. Use the high value
(
1 . 0 × 10
H )
exponent H in the following
equation to convert the voltage output to pressure:
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