PLI Portable Liquid Level Gauge                                

Overview of the PLI liquid level gauge

The PLI portable liquid level gauge is designed to offer a simple, accurate, rapid and reliable method of determining the liquid level of high or low pressure CO₂, Halon, FM200, Propane and any liquefied gas under pressure, without the need to move or weigh the cylinders. There is no reduction in health and safety, and the risk of gas leaks during servicing is eliminated as cylinders remain active and in situ*.

The PLI can be used on cylinders, pipe-work and any single skinned holding vessel with up to 25mm thick walls.  It will also indicate the level of oil or water in a container or tank.

The PLI gives accurate results by generating an ultrasonic sound wave that travels through the container and into the liquefied gas or fluid. The pulse responds differently to the presence or absence of liquid, indicating the level of the liquid.

*Please note when the unit is being used to determine the level of liquid CO₂, an ambient temperature of over 27ºC will not give a result, as above this temperature the CO₂ changes state from a liquid to a gas.

PLI liquid level gauge applications

To find the level of liquid or liquefied gas in

• Metal cylinders
• Pipe work
• Any single skinned pressurized vessel
• Liquid storage tanks

The complete PLI liquid level gauge kit includes:

• PLI liquid level gauge
• protective leather case and neck strap
• Piezoelectric sensor
• 94cm three-section telescopic extension
• 125ml bottle of couplant
• Full operating instructions
• 4 x 9v PP3 batteries
• Foam-lined black polymer carry case

PLI Technical Specifications

• Accuracy:  ±10mm
• Features:  Power boost facility for cylinders in poor condition and cylinder wall thickness selector for thick (>4mm) or thin (<4mm) walled cylinders.
• Unit Dimensions: 200 x 100 x 40mm
• Unit Weight: 300g
• Sensor: 1.5m cable and magnetic clamp for hands-free use
• Sensor Dimensions:  95 x 60 x 60mm
• Temperature Range:  -10ºC to +50ºC*
• 94cm-long extension arm
• Power Supply: 2 x 9vPP3 batteries
• Battery Life:  20 hours nominal with 2 PP3 alkaline batteries
• Carry Case Dimensions: 450 x 370 x 100mm
• Operational Weight:  700g
• Shipping Weight:  2.5Kg

*Please note when the unit is being used to determine the level of liquid CO₂, an ambient temperature of over 27ºC will not give a result, as above this temperature the CO₂ changes state from a liquid to a gas.

How to operate the PLI

1. Wipe clean the cylinder in the area that the sensor is to be placed and apply couplant to the sensor. Place the sensor in an area known to be above the liquid level.  Always orientate the sensor so the white dot is at the top.

2. Adjust the GAIN control until the meter shows a reading near to 10 but not above 10.

3. Place the sensor in an area known to be below the liquid level. The meter should read towards 0 but not below 0.  

4. As the sensor is moved upwards towards the liquid level the meter will start to move towards 10. When the whole of the sensor footprint is above the liquid level, the meter will read 10.  When the sensor is at the liquid level the gauge reading will read a value un between 10 and 0.  What you are looking for is the large change in value between a reading below the liqui level and one above the liquid level.  A reading of approximately 5 at the liquid level is suggested.

Accreditations

American Bureau of Shipping Classification Society Manufacturing Process Approval
ISO 9001:2008 Certificate Number GB13487
NATO Number 6635-99-551-8617
NCAGE Number U0B22
IIMS Corporate Membership Number C508
Nautical Institute Membership Number CA00059
NFPA Membership Number 2800960