Arjay Engineering articles

An electrical parameter which physically is most easy to define, electrically often misconstrued.

Physically, a capacitor is two electrical conductors separated by a non-conducting (or very high resistance) medium between the conductors. Consider the two plates of area (A) in Figure 1. The plates are metallic and they are separated by a distance (D).

Figure 1.


C=KA/D

If we fill the space between the plates

The sensor mounting location within a space may be dependent on many variables. There are no specific formulas since each application will have it’s own determining factors and priorities.

These include, but are not limited to:

• source of gas: Is the source a combustion exhaust from a vehicle or furnace or a vapour from a tank spill, pipe leak, or faulty valve?
• density of gas: some gases are light than air and will rise, others are heavier and will migrat

How does it affect you, the Building Owner and HVAC Contractor?

There has been a lot of press regarding Carbon Monoxide Detectors (CO) and Smoke Detectors in the news over the past year. In most cases, this is justified and certainly the attention and awareness is important. As a contractor though, how does this affect you and the HVAC market place? It’s important to understand the difference between private residential monitoring for personal safety and commerc

Applications for industrial oil in water monitoring can vary greatly.

In upstream and midstream oil and gas production applications, monitoring separation efficiencies is key to optimize production rates, preventative maintenance, chemical use, flow, and environmental compliance. Separated water from the oil is called produced water and it must be cleaned of oil before disposal or re-injection.

In downstream applications and for end-users of fuels and oils, en

The growing demand for underground and enclosed parking and maintenance garages (resulting from limitations on land availability) has increased the awareness and need for proper ventilation and control systems. In addition, increased health and safety programs have only added to the concerns of toxic and combustible gases in confined or enclosed spaces.

Historically, ventilation and make-up air fans were operated on a continuous or time-cycling basis. Advances in the gas detection ind

There has been a lot of press regarding Carbon Monoxide Detectors (CO) and Smoke Detectors in the news over the past year. In most cases, this is justified and certainly the attention and awareness is important. As a contractor though, how does this affect you and the HVAC market place? It’s important to understand the difference between private residential monitoring for personal safety and commercial or industrial monitoring for ventilation.

In residential dwellings, improveme

In the world of technology stars, capacitance has been type-casted.

For over 100 years, capacitance has performed in countless applications for industrial control and automation. It is routinely used for high and low level alarm, continuous level monitoring, interface transmitters, plugged chute detection and even dry pump control.

As new technologies have been introduced, such as ultrasonics, optics, radar and guided wave, capacitance has fi

Fluorescence can be found in many applications throughout our day-to-day routines.

Commercially, one of the most obvious uses is in fluorescent lighting. For this, fluorescence is used to emit light from a tube without the use of heat, unlike standard incandescent light bulbs that require a heated element. In this example, fluorescence also contributes to energy conservation efforts.

At an industrial level, the fluorescence principle is an integral part in the production of

1. Introduction

Oil contamination continues to be a very hot topic, due largely in part to recent catastrophic events with shipping tankers in open waters. The coastal contamination off Spain, the Valdez in Alaska,