Rev. 2 1
1 Introduction
1.1 Model 1700 Instrument
The AMI Model 1700 Liquid Level Instrument is a sophisticated
measurement and control instrument which provides monitoring liquid
helium and/or capacitance-based level sensors as inputs and provides for
automatic level control based on user set parameters.
At time of purchase, the Model 1700 will be configured as:
• A capacitance-based (typically liquid nitrogen)
1
level instrument/
controller.
1.1.1 Cryogenic (Capacitance-Based) Liquid Level Sensors
The Model 1700 Instrument will be used with a capacitance-based sensor
for all cryogenic liquids except for helium. Special insulated capacitance
sensors are required for liquids with electrical conductivity, i.e. water.
The Model 1700 Instrument must use an oscillator device to measure
cryogenic liquid levels. This instrument has an internal oscillator if the
distance between the sensor and the instrument is less than or equal to 15
feet (457 cm) so no external oscillator is necessary. If the distance between
the sensor and the instrument is greater than 15 feet, an external
oscillator/transmitter unit is necessary. The instrument will automatically
1. The instrument can be used to measure/control any cryogenic liquid but the most
common is nitrogen.
To Next Page
Loading...