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FAQs

Sorted alphabetically by category

Controllers

What is Reverse and Direct Acting show

Reverse acting is for heating, i.e. The relay closes if the temperature is below the set point, turning the heating on. Direct acting is for cooling, i.e. the relay closes if the temperature is above the set value, turning the cooler on.

Controller Keylock - Stop the fiddlers show

The keylock function is useful to help stop the fiddlers. Most controllers have this feature and normally you can select different levels of lock. i.e. Lock the setup but let the set value still to be changed.

Auto Tune show

The Auto Tune function in controllers is a great feature and we recommend you use it. Activate it when your process is heating up and let it run. Normally you will find your process will overshoot and undershoot a couple of times, this is ok, it's working out it's settings. You should soon see the auto tune light go out and the control should settle to almost straight line control. i.e. PV stays the same as SV. Note that avery process is different and some times the Auto Tune function is unable to tune your process, this is normally associated with very fast or very slow processes. If in doubt, call us and we'll help step you through.

Data Loggers

Can you send me another copy of HOBOware, we’ve misplaced ours show

HOBOware is a licensed software. Like all licensed software, HOBOware has a unique licence key issued with each copy of HOBOware. The licence key is a 16 digit number printed on the original packaging of your disc. With the following format xxxx-xxxx-xxxx-xxxx Note: the licence key is also recorded in the software and can be found in the help menu in manage licence key. In line with Industrial practice we do not keep records of Licence keys: It is the responsibility of the owner to preserve this information.

HOBOware-Pro is an advanced version and can be purchased, HERE

HOBOware is a free download: HERE

Energy

What is the difference between kW and kWh? show

Water Analogy:- If you consider electricity as though it is water: Power = Gallons per minute. This goes to zero if you stop using water. Energy = Total gallons consumed. This is what you are billed for. Even if you stop using more water, your total stays the same, it just doesn't get any higher. ----- Speedometer Odometer Analogy:- You can imagine that power (W) is like your speedometer (current speed), while energy (kWh) is like your odometer. The speedometer can quickly go from zero to sixty and back to zero, but the odometer only slowly counts up: faster if your speed is faster. The speedometer tells you how fast you are going right now (how much power you are using right now), while the odometer tells you how far you've gone (how much energy you've used in total). ------- More info:- http://www.onetemp.com.au/p/1929/what-is-the-difference-between-kw-and-kwh

Eze Web Base Controllers

How much data does an EZEIO use show

Typical data usage for a full month is about 5 Mega Bytes, but may vary depending on how frequently logging data is captured and other configuration parameters. But note: The status screen causes full status updated to happen every few seconds (obviously - to keep the data live). This consumes about 400 bytes every 3-4 seconds, which adds up to a Meg roughly every 2h so if you have a 3G device don't keep it open too long.

How many temperature probes can I connect to EZEIO show

Max 20, but also max of 50m of cabling (including sensors) in entire network

Will the Eze Ethernet work with a Proxy show

It's impossible to say if it will work behind their proxy. It's completely up to the type of proxy and what the settings/policy is. Some proxies do "deep packet inspection" and basically refuse anything they do not recognize - in that case the ezeio will not work at all since each packet is encrypted and there is no easy way to recognize a packet - each packet is just a random number of random bytes.. Generally If IT allow UDP port 8844 outgoing and "keep state" for the return traffic, it should be fine.

Power or Comms failure alarm show

The administrator and any designated email address will receive an email if power or communications fails

Automatic reporting show

The Eze system can be set to automatically email PDF reports, Daily, weekly or monthly, for any recorded input.

Infrared Thermometers

How does an Infrared Thermometer work show

IR thermometers capture the invisible infrared energy naturally emitted from all objects. Infrared radiation is part of the electromagnetic spectrum which includes radio waves, microwaves, visible light, ultraviolet, gamma, and X-rays.

What is Emissivity show

This infrared "invisible heat" of an object is transferred in three ways: Reflected, Transmitted, and Emitted. Reflected energy is not particularly related to the temperature of the target object, and transmitted heat is related to the both the internal temperature of the target object and the temperature of the "transmitted to" object. The only type of energy that can be used to tell that actual surface temperature of the object is Emitted energy. When IR thermometers are used to measure surface temperature they can potentially sense all three kinds of energy, therefore all thermometers have to be adjusted to read Emitted energy only. Measuring errors are often caused by IR energy being reflected by light sources. Some IR thermometers allow you to change the Emissivity in the unit. The value of Emissivity for various materials can be looked up in published Emissivity table. Other units have a fixed, pre-set Emissivity of 0.95, which is the Emissivity value for most organic materials and painted or oxidized surfaces. If you are using a thermometer with a fixed Emissivity to measure the surface temperature of a shiny object you can compensate by covering the surface to be measured with masking tape or flat black paint. Allow time for the tape or paint to reach the same temperature as the material underneath. Measure the temperature of the taped or painted surface. That is the true temperature.

Field of view show

Make sure that the target is larger than the spot size the unit is measuring. The smaller the target, the closer you should be to it. When accuracy is critical make sure that the target is at least twice as large as the spot size.

Distance to spot ratio show

The optical system of an infrared thermometer collects the infrared energy from a circular measurement spot and focuses it on the detector. Optical resolution is defined by the ratio of the distance from instrument to the object compared to the size of the spot being measured (D:S ratio). The larger the ratio number the better the instrument's resolution, and the smaller the the spot size that can be measured. The laser sighting included in some instru­ments only helps to aim at the measured spot. A recent innovation in infrared optics is the addition of a Close Focus feature, which provides accurate measurement of small target areas without including unwanted background temperatures.

Pressure

Understanding Pressure Measurement Types show

A frequent misunderstanding that we encounter concerns the types of pressure measurement. There are five common types used in industrial instrumentation: gauge, vacuum, compound, differential and absolute. Three of these are really the same type of measurement. These are gauge, vacuum and compound. All of these measurements are relative to the ambient or local atmospheric pressure (also called barometric pressure). The vast majority of process control and monitoring applications are these relative measurements. Gauge is a positive pressure relative to atmosphere. Tire pressure on an automobile is one that everyone would be familiar with. Vacuum on the other hand is a negative pressure relative to atmosphere. Vacuum readings are shown as a negative number. Manifold pressure in an engine would be an everyday example of this measurement. Vacuum measurement is commonly associated with applications where some type of suction needs to be measured or controlled. Compound pressure is a “compound” of gauge and vacuum pressure. It’s not really a type of measurement, but rather indicates that the instrument can measure and display, control, transmit or record both gauge and vacuum pressures. Differential is a relative pressure measurement where the reference is some variable pressure other than atmospheric. It is often a measure of pressure drop in a flowing media such as air, water or some fluid in a process. It can be used and interpreted as a measure of volumetric flow. Devices that measure differential pressure have two ports or connections. These are normally labeled “high” and “low” with low being the reference pressure. Differential measurements can be positive (gauge), negative (vacuum) or both (compound). Finally, absolute pressure measurement is the real odd-ball of the lot. Rather than being a measurement relative to local atmosphere, it is a measurement relative to an absolute vacuum. So, an absolute measurement of the atmospheric pressure is about 760 mm of Mercury column at earth sea level. Sometimes this is difficult to understand because many process applications are measurements that are less than atmospheric, which we normally think of as vacuum. Distillation columns in refineries and chemical plants are good examples of this application. Absolute measurements are always relative to the same fixed reference, not a changing reference like atmospheric pressure, and that’s the big difference.

Wiring

How do I wire a 4-20mA Loop show

Sensor + to Power supply +, Power supply - to indicator -, Indicator + to transmitter -

Thermocouple cable colour show

Normally in Australia we use the ANSI (American) Colour code. RED is Negative.

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