Em50/Em50R Operator’s Manual9. Compatible Sensors

ture sensor in air, we strongly recommend that youuse it in a radiation shield. Decagon has a radiationshield that can be used with the ECT. If you wouldlike to purchase one, please contact us.Default Conversion EquationThe default conversion equation for the ECT firstcalculates an intermediate value with a log trans-form (natural log), then the temperature in °C from a3rd-order polynomial:

This equation offers 0.5 °C accuracy in the range of-40° C to + 60° C.

The ECT temperature sensor can be used with anyport on the Em50.

ECRN-50 and ECRN-100Rain GaugesThe ECRN-50 and ECRN-100 are simple self-emp-tying electronic rain gauges. They are made of dura-ble, weather-resistant plastic that is UV-resistant.

The ECRN-50 is best used for measuring irrigationevents. This sensor has a resolution of 1 mm. Youcan configure the Em50 to treat the data collected bythe ECRN-50 as standard precipitation or as volumedata. Configured as volume gauges, they are useful

x 4095RAW-------------

1∠ ln=

C 25.02 x 22.84∠ x 1.532 0.08372x∠( )+( )+( )+=°

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Em50/Em50R Operator’s Manual9. Compatible Sensors

for measuring the output of irrigation systems interms of gallons (or liters) per hour

The ECRN-100 is a high-resolution rain gauge witha 0.2 mm resolution.

NOTE: The older model ECRN Rain Gauge usedwith Em5 loggers is not compatible with the Em50.Please contact Decagon for an ECRN upgrade kitthat will allow you to use it with the Em50.

Default Conversion EquationsThe Em50 uses an accumulating counter for storingrain gauge tip events. To calculate the number of tipsfor one time interval (interval n), you compare it tothe previous interval (interval n-1).

tips = RAWn - RAWn-1 for RAWn > RAWn-1 tips = RAWn for RAWn-1 = 0

ECRN-50 precipitation is 1 mm per tip; volume is 5mL per tip.

ECRN-100 precipitation is 0.2 mm per tip.

The ECRN-50 and ECRN-100 can be used with anyport on the Em50.

G1 Drain GaugeDecagon’s Drain Gauge is an instrument that isdesigned for long-term monitoring of water move-ment and chemical leaching below the root zone.

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