Prevac MG14 Operating Manual page 30

MG14 operating manual Rev 1.4
4.2.4.1 Sensor menu - Sensor
Sensor menu allows to chose type of IONI transmitter and its parameters on channel 1. Channel 2 is
associated with any OERLIKON/LEYBOLD transmitter with analogue output. Gauge TTR 91 is a
default one on chanell2:
There is possible to choose one of 3 onivac sensors:
- Ie 514 gauge (EXTRACTOR OERLIKON/LEYBOLD)
- Ie 414 gauge ( B-A OERLIKON/LEYBOLD )
- Bayard-Alpert gauge - universal
NOTE:
Emission current of Ie514 and Ie414 is limited according to the manufacturer specyfication
4.2.4.2 Gauge parameters
There is an individual set of Bayard-Albert ionization sensor. Such a possibilities makes MG14
flexible unit and can be customized to most Bayard-Alpert existing on the market.
Using the narrow buttons ▲or▼ and MENU/ENTER button you can move between the parameters
and set the values.
4.2.4.3 Emission current menu – EMIS.CURR
The following emission current for B-A gauge can be choose:
0.1 ..... 1,99 mA ( adjustable )
-
- 2mA
- 4 mA
- 10 mA
Those currents are typical for most available B-A gauges, and should be set correctly to the gauge
manufacturer specification. How ever each of those parameters can be choose for any B-A gauge.
Pressure measurement is calculated to the following rule:
where:
Fig 4-12 Sensor menu
P = I / (S x I )
c g e
P – pressure
– Ion current
I
c
– sensitivity factor for gas g
S
g
– emission current
I
e
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