The new Model 1700 Liquid Level Instrument.
The low-cost Model 110A liquid helium level meter reliably measures the helium level in a dewar. A 3.5 inch analog display provides 0-100% liquid helium level indication. A 0-10 V recorder output is provided on the rear panel of the instrument. The Model 110A can be used with any AMI liquid helium level sensor
up to 60 inches in active length.
The Model 110A is commonly used for quick and accurate level indication in portable helium storage containers such as those pictured here. Simply plug the unit into the nearest outlet, read the level in percent and then covert to volume using the transport dewar strapping sheet. Level sensors can be built-in by the dewar manufacturer or provided direct from AMI with a metal top sleeve for sealing through the withdrawal port using the standard compression fitting. Simple sheet metal brackets are used to create a platform for the level instrument.
The Model 150A is a lightweight, hand-held meter for use with helium storage dewars on loading docks or in storage rooms, or in remote helium level operations where line power is unavailable. The Model 150A includes a 3.5 digit LCD display with readout accuracy of 0.5%, and a push-to-read switch that allows level measurements to made within seconds. The Model 150A is designed for use with AMI liquid helium level sensors up to 60" in active length.
The Model 160 Liquid Helium Level Superconducting Dipstick is designed for measuring the level of liquid helium storage dewars that are accessible from the top. Battery operated and easy to use, the Model 160 offers ultra-low helium consumption and outstanding accuracy and repeatability. The dipstick is a cost effective, low-loss, and accurate alternative to flutter tubes and carbon resistor liquid helium level measuring devices.
The Model 160 consists of a superconducting point sensor mounted on a 72" extension tube with 6 feet of cable connecting the sensor to the hand held electronics enclosure.
The electronics enclosure is small, lightweight, and completely detachable from the sensor for ease of operation. This point sensor is provided on a Rigid fiberglass wand.
The Model 160 can be used to monitor the presence of liquid helium, such as in the case of determining the liquid helium level in a storage dewar. When the sensor makes contact with the liquid helium, an audible alarm and LED will energize. The Model 160 can also be alternately configured to indicate when the liquid helium has lowered to a predetermined level by "fixing" the dipstick at a level in the liquid helium. When the liquid helium level lowers to the point of breaking contact with the dipstick, the audible alarm and LED will energize. This device offers highly accurate level determination and is an excellent alternative to unreliable flutter tubes or carbon resistor devices.