Features

• 10 Segment bar graph
• Constant / pulsed time on
• Pre-settable level trip
• Variable AC mains in

The AS Scientific Helium Level Indicator together with the appropriate probe, provides a means of measuring the level of liquid helium in a container. When the probe is immersed in the liquid helium, a voltage is developed across the probe which is inversely proportional to the depth of the liquid. This proportionality is indicated by means of a 10 segment bar graph measured as a percentage level. The AS Scientific Helium Level Probe consists of a very thin superconducting wire housed inside a stainless steel tube. At ambient temperature, the resistance of the wire is high. The Level Indicator provides an approximate current of 100 mA to the probe.

Specification
The WEST 2073 is a self-tuning high performance microprocessor, with two gauges located on the front of the box. One gauge is the Regulated Supply, which sets the pneumatic pressure entering the I/P, the other gauge is the Pneumatic Signal, which is the pneumatic pressure from the I/P to the control valve. (An I/P is a unit which converts electrical current from the process controller to a proportional pressure in either filtered air or dry nitrogen gas.)

Specification

Mechanical:

• Standard Eurocard housed in KM6-11 module

Electrical:

• Mains Input: Standard - 240 Volts A.C. 50Hz - Nominal - 90 - 260 Volts A.C. 50 Hz
• Relay contact - 250 V 5 A
• Probe: Standard - 66 m × 0.08" st. tube - Niomax superconducting wire, resistance 130 Ω