Choosing Probes and Float Systems for Your Water Column

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Water column instruments are devices designed to provide accurate pressure readings and help water level indicating operations run smoothly. The three primary components of water level indication systems include a water column, control unit, and remote display.

Choosing Probes for Your Water Column

Probe is an essential part of the water column. Here are some helpful tips that you should keep in mind when choosing probes for your water column.

1.       Electrical probe safety systems operate a larger number of functions than mechanical float safety. Probes may be positioned to actuate audible and/or visual alarms, fuel cut-out controls, pump controls, or other equipment. Thus, choose probes over mechanical floats.

2.       Exceptional probe sensitivity increases system reliability. Choose probes that feature high sensitivity and perform at the forefront of probe technology. In particular, make sure that ach probe model will respond to pure water of ultra-low conductivity (less than 1 micro mho) to complete circuits. In addition, choose probes with service life that is extended by using available renewing kits.

3.       Choose probes with an alarm system that provides an on/off actuation of high and low water alarms. Other features which you can look for include fuel cut-out trip, pump control, and PCB control unit.

Choosing Float Systems for Your Water Column

1.       Choose a reliable float that warns of high/low water levels in cast iron columns serving 0 to 250 PSI or forges steel columns serving pressures up to 900 PSI.

2.       Choose a mechanical float type alarm system that employs lightweight floats and responds to as little as one-quarter inch level variations. Alarm components sit high in the column, removed from corrosive agents and scale. Quality materials and design simplicity combine to minimize requirements for periodic adjustment and maintenance.

To know more information about water column, probes, and float systems, consult with the experts at Quest Tec Solutions, manufacturers of high-quality liquid level indicators and gauges.

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Common Failures of Magnetic Sight Glasses

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Improper installation of magnetic sight glass can lead to device failure. This includes over tightening and uneven torqueing which can produce bending loads on the glass which can potentially result to cracking. Another cause of failure is trapped debris that causes a bending moment, such as from gaskets that become baked onto the flanges and portions are left behind when removed.

Some low-quality devices may not have flat and parallel surfaces which is often a product of poor or low tolerance manufacturing. This also may result in a bending load on the glass.

It is not uncommon for a sight glass to be used as a handy place to rest a wrench or other tool. This may scratch the glass, creating a source for breaks to originate, also known as stress concentrations. Even though a bending load is required to open these cracks, they significantly reduce the pressure capabilities of the glass.

Thermal shock is a sudden, drastic change in temperature that causes one side of the glass to expand or contract differently from the other side. This can occur when a cold sight glass experiences a sudden increase in temperature at process startup, or when a hot sight glass is suddenly cooled during an external wash down of equipment.

Of course, over-pressurization can cause a sight flow indicator to fail. A properly specified unit should have an ample safety margin.

Lastly, degradation of the glass over time can lead to failure. Chemicals, and even water, will corrode glass. There are several chemical resistance charts that illustrate the loss of weight of glass when exposed to various chemicals. Another source of degradation is the continuous friction from an abrasive product against the glass.

A magnetic sight glass is an important device that provides a clear view during liquid level indicating. However, when not used properly and maintained well, it can lead to minor and major failures.

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