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Em50/Em50R Operator’s Manual 9. Compatible Sensors

ture sensor in air, we strongly recommend that you use it in a radiation shield. Decagon has a radiation shield that can be used with the ECT. If you would like to purchase one, please contact us. Default Conversion Equation The default conversion equation for the ECT first calculates an intermediate value with a log transform (natural log), then the temperature in °C from a 3rd-order polynomial: 4095 x = ln   ------------- ∠ 1 RAW °C = 25.02 + x ( ∠ 22.84 + x ( 1.532 + ( ∠ 0.08372x ) ) ) This equation offers 0.5 °C accuracy in the range of -40° C to + 60° C. The ECT temperature sensor can be used with any port on the Em50.

ECRN-50 and ECRN-100 Rain Gauges The ECRN-50 and ECRN-100 are simple self-emptying electronic rain gauges. They are made of durable, weather-resistant plastic that is UV-resistant. The ECRN-50 is best used for measuring irrigation events. This sensor has a resolution of 1 mm. You can configure the Em50 to treat the data collected by the ECRN-50 as standard precipitation or as volume data. Configured as volume gauges, they are useful


Em50/Em50R Operator’s Manual 9. Compatible Sensors

for measuring the output of irrigation systems in terms of gallons (or liters) per hour The ECRN-100 is a high-resolution rain gauge with a 0.2 mm resolution. NOTE: The older model ECRN Rain Gauge used with Em5 loggers is not compatible with the Em50. Please contact Decagon for an ECRN upgrade kit that will allow you to use it with the Em50. Default Conversion Equations The Em50 uses an accumulating counter for storing rain gauge tip events. To calculate the number of tips for one time interval (interval n), you compare it to the previous interval (interval n-1). tips = RAWn - RAWn-1 tips = RAWn

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

ECRN-50 precipitation is 1 mm per tip; volume is 5 mL per tip. ECRN-100 precipitation is 0.2 mm per tip. The ECRN-50 and ECRN-100 can be used with any port on the Em50.

G1 Drain Gauge Decagon’s Drain Gauge is an instrument that is designed for long-term monitoring of water movement and chemical leaching below the root zone.


ECRN-100 & ECRN-50 Rain Gauges  
ECRN-100 & ECRN-50 Rain Gauges  

Rain Gauges Manual v6 taken from Em50 Manual v6