Precipitation Sensors / TE525MM-L
TE525MM-L Metric Rain Gage with 9.6 in. Orifice

Overview

The TE525MM, manufactured by Texas Electronics, is a tipping bucket rain gage that monitors rainfall in metric rather than US units. It measures in 0.1 mm increments and has a 24.5 cm funnel. This tipping bucket is compatible with all Campbell Scientific data loggers, and is widely used in environmental monitoring applications.

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Benefits and Features

  • Accuracy is ±1 percent at rates up to 1 in./hr
  • Compatible with most Campbell Scientific data loggers
  • High precision—tips at 0.1-mm increments
  • Compatible with the CWS900-series interfaces, allowing it to be used in a wireless sensor network
  • Includes a 24.5-cm funnel, which is the largest diameter funnel of the TE525-series raingages

The "-L" on a product model indicates that the cable length is specified at the time of order.


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Detailed Description

The TE525MM funnels precipitation into a bucket mechanism that tips when filled to its calibrated level.  A magnet attached to the tipping mechanism actuates a switch as the bucket tips. The momentary switch closure is counted by the pulse-counting circuitry of our data loggers.

Specifications

Sensor Type Tipping bucket with magnetic reed switch
Material Anodized aluminum
Operating Temperature Range 0° to 50°C
Resolution 1 tip
Volume per Tip 4.73 ml/tip (0.16 fl. oz/tip)
Rainfall per Tip 0.1 mm (0.004 in.)
Accuracy 1.0% up to 50 mm/h (2 in./h)
Cable Type 2-conductor shielded
Orifice Diameter 24.5 cm (9.66 in.)
Height 29.21 cm (11.5 in.)
Cable Weight 0.1 kg (0.2 lb) per 3.05 m (10 ft) length
Tipping Bucket Weight 1.1 kg (2.4 lb)

Compatibility

Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
21X (retired)
CR10 (retired)
CR1000 (retired)
CR1000X
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR3000
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR6
CR800
CR850
CR9000 (retired)
CR9000X (retired)

Additional Compatibility Information

Mounting

The TE525MM rain gage mounts to a CM300-series Mounting Pole or a user-supplied 1.5” IPS pole. Several pedestal options are available to secure a CM300-series pole to the ground (see Ordering Information). Accurate measurements require the gage to be level.

Snowfall Adapter

The TE525MM cannot be directly used with our CS705 rainfall adapter. However, the CS705 is compatible with the TE525WS, and the TE525MM can be converted to a TE525WS by returning it to Campbell Scientific (requires an RMA).

Wind Screen

Campbell Scientific offers the 260-953 Wind Screen to help minimize the affect of wind on the rain measurements. This wind screen consists of 32 leaves that hang freely and swing as the wind moves past them.


Frequently Asked Questions

Number of FAQs related to TE525MM-L: 15

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  1. The TE525MM-L has a 0.1 mm tip.
  2. At high-intensity rainfalls, it is likely that the rain will keep pouring into the tipper mechanism while it is tipping, so it will essentially splash out and not be registered. In those instances, there are less tips of the bucket—thus the -3% and -5% listed in the specifications.

  3. Replacement screens and funnels can be ordered by calling Campbell Scientific.

  4. 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.

  5. A TE525-L can be converted to a TE525MM-L and vice versa because the inner tipping mechanisms are the same. To convert a TE525-L or TE525MM-L to a TE525WS-L, the rain gage must be sent in to Campbell Scientific to change the tipping mechanism. If an 8 inch funnel is used on a TE525-L or TE525MM-L without changing the tipping mechanism, the multipliers for the rain measurement will change. For information about these multipliers, see the TE525 Instruction Manual

  6. The 260-953 Alter-type rain gage wind screen consists of 32 heavy metal leaves that hang freely and swing as the wind moves past them. The swinging leaves act as a wind damper and help minimize the effect of wind on the rain measurements without adding additional turbulence.

  7. The most common errors are either that the rain gage appears to have drifted out of calibration or that the tips are not being correctly recorded by the data logger. 

  8. The information included on a calibration sheet differs with each sensor. For some sensors, the sheet contains coefficients necessary to program a data logger. For other sensors, the calibration sheet is a pass/fail report.

  9. Most Campbell Scientific sensors are available as an –L, which indicates a user-specified cable length. If a sensor is listed as an –LX model (where “X” is some other character), that sensor’s cable has a user-specified length, but it terminates with a specific connector for a unique system:

    • An –LC model has a user-specified cable length for connection to an ET107, CS110, or retired Metdata1.
    • An –LQ model has a user-specified cable length for connection to a RAWS-P weather station.

    If a sensor does not have an –L or other –LX designation after the main model number, the sensor has a set cable length. The cable length is listed at the end of the Description field in the product’s Ordering information. For example, the 034B-ET model has a description of “Met One Wind Set for ET Station, 67 inch Cable.” Products with a set cable length terminate, as a default, with pigtails.

    If a cable terminates with a special connector for a unique system, the end of the model number designates which system. For example, the 034B-ET model designates the sensor as a 034B for an ET107 system.

    • –ET models terminate with the connector for an ET107 weather station.
    • –ETM models terminate with the connector for an ET107 weather station, but they also include a special system mounting, which is often convenient when purchasing a replacement part.
    • –QD models terminate with the connector for a RAWS-F Quick Deployment Station.
    • –PW models terminate with the connector for a PWENC or pre-wired system.

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