Why was the Siphoning Rain  Gauge Designed?

How accurate is it?

How does it accomplish and maintain this accuracy?

How does it stand up to a variety of weather conditions?

What is the RGS-100 made of?

Where can it be installed and does it come ready for installation?

How does the electronics work?

Can the unit be used with a heater?

Can the RGS-100 operate as a stand-alone unit?

What is the difference between the RGS-100 & RGS – 100 HL?

What is our guarantee?

Why was the Siphoning Rain  Gauge Designed?

The RGS-100 has been designed to respond to the problems experienced by users of the traditional tipping bucket rain gauge. In a clean lab setting where rain gauges are calibrated it is relatively easy to maintain precise calibration and acquire accurate readings. But as you know, this is not the real world. As soon as you take the tipping bucket rain gauge out of the lab and into the real world it has to deal with real world elements - sand, dust, bugs, heavy rain, snow and even lightning. The RGS-100 has not only been designed to be the most accurate rain gauge on the market today but it has been designed to maintain that accuracy outside the lab - in the field where it counts.         Back to FAQs

How accurate is it?

The RGS-100 is calibrated from 0-300 mm (0 to 11.8 inches) per hour of rainfall. It is has an accuracy of +/- 2% at 0- 200 mm/hr and -5% at 200 - 300 mm/hr. It can maintain that kind of accuracy regardless of the conditions. The traditional tipping bucket rain gauge is calibrated in the lab to a fixed rate of rainfall. When it’s taken out into the field for practical use the rate of rainfall and accumulation of dirt affect its accuracy and give false readings. The RGS-100, on the other hand, is not affected by the rate of rainfall and dirt because it uses a protected chamber to collect and measure the rainfall and then a siphoning action drains the chamber of water. Because the RGS-100 uses this type of technology and is not effected by how hard the rain comes down, the rain rate can then also be measured ad infinitum. It can accurately measure flow rates between 0mm and 300mm (0" to 11.8") per hour. To further enhance the accuracy we have also designed the electronics to omit false readings. These entire design enhancements make the RGS-100 a very precise rain gauge (see specifications).            Back to FAQs

 

How does it accomplish and maintain this accuracy?

It’s quite simple. It does this by not having any moving parts. Water, collected by a funnel, is routed to a protected measuring chamber. As the chamber fills up a solid-state level sensor connected to an electronic circuit outputs a contact closure for every 0.2 mm of rain collected. When 1.2 mm of water is collected it is siphoned out onto the ground. The process repeats indefinitely. The siphoning action takes approximately 1 second so no rain is lost during this process. By measuring rainfall with accurate electronics and in a clean environment within the protected chamber the RGS-100 is far more reliable and accurate compared to the common rain gauge in use today. By not having a tipping arm that moves and collects dirt, the RGS-100 NEVER requires calibration. The RGS-100 may also be calibrated so that a contact closure is outputted for every 0.01 inches of rainfall.          Back to FAQs

 

How does it stand up to a variety of weather conditions?

The unit was designed for Canadian weather conditions. The weather and temperature varies greatly from region to region and from season to season. The unit has been successfully tested in different weather conditions. For instance, the RGS-100 may be left outside during the winter and it will NOT be harmed. It will simply stop operating. When the temperature rises above 0º C (32º F), and the ice inside the unit melts then the RGS-100 will operate normally again. It is not recommended you use the RGS-100 to measure snowfall.        Back to FAQs

 

What is the RGS-100 made of?

Every part of the RGS-100, other than the electronics, is made of high quality plastics to withstand the variety of climates (including snow) that we have in Canada. The exterior housing is made of PVC and the interior siphoning tubes are made of Teflon. We use Teflon to ensure smooth siphoning out of water. Teflon also allows for the elimination and any other small particles that might enter the chamber. Because insects often affect the performance of gauges, screens protect all orifices. The only insects that can enter into the measuring chamber are the size of a small ant. Any insect trying to make a home in the unit will be siphoned out in the first rainfall. This prevents any type of clogging. Because the unit is completely made up of plastics it is highly resistant to living organisms.            Back to FAQs

 

Where can it be installed and does it come ready for installation?

The RGS-100 can be installed anywhere and it comes ready for installation in the field. No assembly or calibration is necessary. It need only be mounted, leveled and attached to a contact closure input of any data logger.            Back to FAQs

 

How does the electronics work?

The RGS-100 electronics are comprised of CMOS IC’s. They are housed in a styrene casing inside the PVC outer shelf and protected from lightning with lightening protection circuitry.

The electronics are connected to the gauge via a six-conductor data cable. As each 0.2 mm of water enters the chamber the corresponding probe on the level sensor conducts to the ground probe. The circuit converts this into a contact closure within typical market standards. An alternating current is used to prevent electrolytic plating of the probes by minerals in the rainwater. In addition, the probes are stainless steel to prevent oxidation.

The RGS-100's output is completely isolated from other equipment via a relay switch. The output is a contact closure, so the user need only supply a voltage (digital input of a data logger) to the output of the gauge to register the contact closures. The supply voltage required is between 9 to 18 volts dc, and does not need to be regulated. The current consumption is between 400 to 800 micro (millionth of) amps. This makes the RGS-100 ideal for remote applications where a battery or a solar panel is used as a supply. In addition, to make the electronics easier to maintain the electronic circuit of the RGS-100 comes with 5 built-in test switches so the electronics can be tested independent of the probes. The toggle switches on the circuit board simulate water covering each of the level sensor probes, respectively. You can turn on each of these switches in sequence to test each of the circuits.       Back to FAQs

Can the unit be used with a heater?

Yes, a heater can be used but only to speed up the melting of ice in the measuring chamber during periods of thaw. We do not recommend you use a heater during sub freezing conditions to melt ice and snow for measuring purposes. The unit has been designed to cease operation during sub zero Celsius conditions.       Back to FAQs

 

Can the RGS-100 operate as a stand-alone unit?

No, it must be hooked up to a data logger. The RGS-100 measures the water but it must be recorded in any data logger hooked up to a digital I/P. The data logger can be placed at any distance away from the RGS-100, length of wire permitting. If you do not currently own a data logger we can supply you with one.            Back to FAQs

 

What is the difference between the RGS-100 & RGS – 100 HL?

The RGS – 100 HL operates on the same principle as the RGS – 100.  It has a dual purpose.  It is a rain gauge and a low level flow meter. As a flow meter it is accurate from 0 to 5 liters of water flow per hour. As a rain gauge it is accurate up to 500mm of rainfall / hour.   The output is a contact closure for every 0.2 mm of rain or 2ml of water flow.  Also, the Electronics is placed outside the shell.  For flows above 5 liters / hour the measurement will be inaccurate, but, as soon as the flow drops below the 5.0 liters/ hour the RGS – 100HL will perform as specified. (see specifications).            Back to FAQs

 

 

What is our guarantee?

The RGS-100 is unconditionally guaranteed for one year. If we make any improvements to the RGS-100 within one year of your purchase date, we will also make the identical improvements to your unit free of charge. The unit is guaranteed to retain its calibration for a period of 2 years. If it needs calibration before that time we will do it for free.       Back to FAQs

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