CS705 Snowfall Adapter for Rain Gages with 8 in. Orifices
Uses No Power
Melts snow without heater
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications

Overview

The CS705 is a snowfall adapter that converts a standard 8 in. tipping bucket rain gage to a year-round rain and snow gage. It is typically used with our TE525WS rain gages.

The CS705 consists of a 14087 funnel, two band clamps, and the CM270 mounting hardware. The funnel drains the antifreeze/precipitation mixture into a pail. One of the band clamps secures the top of the CS705 to a pole. The other band clamp attaches the funnel and the bottom of the rain gage to the pole.

In the image, the CS705 is shown connected to a TE525WS below and attached to a mounting pole. (All items are sold separately.)

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Benefits and Features

  • Melts snow without a heater and therefore eliminates the current consumption associated with heaters
  • Converts a TE525WS to a rain and snow gage

Images

CS705
CS705
CS705
CS705 with TE525WS precipitation gage and mounting pole (sold separately)
CS705 with TE525WS precipitation gage (sold separately)
CS705 with TE525WS precipitation gage, mounted to tripod (sold separately)
CS705 with TE525WS precipitation gage and mounting pole (sold separately)
Exploded view of mounting kit
Exploded view of CS705 with TE525WS precipitation gage (sold separately)

Detailed Description

The CS705 consists of an antifreeze reservoir, overflow tube, and catch tube. Snow captured in the catch tube dissolves into the antifreeze. The melted snow raises the level of the antifreeze and water solution. The mixture flows through the over-flow tube into the tipping bucket where it is measured by the tipping bucket mechanism.

Measurement Delays

The CS705 possesses inherent delays and is not suitable for real-time precipitation measurements. The following factors contribute to the delays:

  • Temperatures of air and liquid in the reservoir
  • Surface tension in the overflow tube
  • Form of the precipitation

For rainfall at 25°C, a delay of minutes is expected after the gage receives a minimum accumulation of ~0.03 inches. For snowfall, a delay of hours to tens of hours is expected. The longest delays should be expected for low density snows at very cold air temperatures. However, all precipitation falling into the catch tube eventually flows through the overflow tube and is measured by the tipping bucket rain gage.

Specifications

Recommended Antifreeze Type 1:1 mixture of propylene glycol and ethanol (PGE)

Campbell Scientific does not recommend using the antifreeze that is typically used in cars or RVs; refer to the Compatibility section for more information.
Material Powder-coated aluminum
Capacity 20.3 cm (8 in.) of liquid @ -20°C (assuming 1:0 starting ratio of antifreeze to water)
Antifreeze Reservoir Capacity 9.46 L (2.5 gal)
Catch Tube Orifice 20.3 cm (8 in.)
Catch Tube Height 25.4 cm (10 in.)
Antifreeze Reservoir Diameter 0.96 cm (8.25 in.)
Antifreeze Reservoir Height 35.6 cm (14 in.)
Weight
  • 2 kg (4.4 lb) without antifreeze
  • ~9 kg (20 lb) with antifreeze

Compatibility

Antifreeze

Recommended Antifreeze

1:1 mixture of propylene glycol and ethanol (PGE)

PGE is available from Campbell Scientific in a package of four, one-gallon containers (see Ordering). Antifreeze can only be shipped in multiples of four gallons via UPS Ground and can not be shipped outside of the Continental US.

Why Straight Car or RV Antifreeze is NOT Recommended

Standard RV antifreeze consist of propylene glycol or ethylene glycol, which has a specific gravity of greater than 1. This allows a layer of water to sit on top of the antifreeze. That layer of water can then freeze and form an ice cap that prevents snowfall from being dissolved in the solution. Cutting the antifreeze with ethanol solves the specific gravity issue and prevents the ice cap. PGE is also more environmentally friendly.

Disposing Antifreeze Mixture

The antifreeze mixture from the tipping bucket gage should be captured and disposed of properly in accordance with local, state, and federal regulations.

Tipping Bucket Rain Gages

The CS705’s specially shaped cylinder allows it to mount to the 8-in. orifice of the TE525WS Tipping Bucket Rain Gage. The CS705 cannot be directly used with the TE525, TE525MM, CS700, TB4, or TB4MM tipping bucket rain gages. Both the TE525 and TE525MM can be converted to a TE525WS by returning them to Campbell Scientific.

Mounting

The CM270 Mounting Kit is included with each purchase of the CS705 Snowfall Adapter. The kit consists of a funnel, two band clamps, and mounting hardware. The funnel drains the antifreeze/precipitation mixture into a pail. One of the band clamps secures the top of the CS705 to a pole. The other band clamp attaches the funnel and the bottom of the rain gage to the pole.

A user-supplied pole or a CM300-series Mounting Pole may be used. The user must provide a pail and a hose with a 0.5-in. inner diameter. The hose must be long enough to span the distance from the funnel outlet to the pail.


Frequently Asked Questions

Number of FAQs related to CS705: 5

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  1. Yes. In the Quickstart section of the instruction manual, Figure 4-1 and Figure 4-2 provide labeled images of the parts with their corresponding part numbers.

  2. Yes. Mixed rain and snow does not cause any issues for the CS705.

  3. The CS705 works with the TE525WS-L rain gage.

  4. Generally, the antifreeze is changed after 8 inches of liquid water have been added to the antifreeze/ethanol mixture.  Eight inches of water will dilute the antifreeze/ethanol mixture to the point where freezing will occur at -20 degrees Celsius.

  5. The CS705 Tipping Bucket Snowfall Adapter cannot be used directly with the TE525-L or TE525MM-L because of the funnel size. To make the rain gages compatible, they can either be sent to Campbell Scientific to be converted to a TE525WS-L, or an 8 inch funnel can be installed. If the funnel is used, see the instruction manual for the appropriate multipliers, as they will change.

Listed Under

Common Accessory for the following products: