SR50A Sonic Ranging Sensor
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12 APPENDIX A: SR50AH Heater Option
12.1 Heater Introduction
The heater option on the SR50AH is intended for installations
where rime ice is problematic. The heater will help to prevent the
ice from forming on the transducer, which can impair proper
operation of the sensor.
The heater option is easily identifiable as the transducer housing
contains a cable port for the heater supply cable.
For battery operated solar powered sites it is recommended that the
power to the heater be turned off when icing conditions are not
occurring to reduce power requirements. The heater power must
be turned off when operating at temperatures of 25°C or more.
12.2 Specifications
Heater
Resistance: 75
Ohms
Nominal Operating Voltage
12 Volts (AC or DC)
Note1
Maximum Rated Wattage:
3 Watts
Maximum Rated Voltage:
15 Volts (AC or DC)
Maximum Operating Temperature: 25°C
Note2
12.2.1 Heating Cable Requirements
Type:
2
conductor
(twisted
pair),
Shielded
Diameter:
4-6mm (0.16 - 0.24 inches)
Recommended Gauge:
22 AWG for Lengths Less than 30
Meters
(100
feet)
Note 1: It is important to use a properly conditioned low noise power source. A
noisy power source will affect operation of the sensor.
Note 2: It is recommended that some form of control be used to turn the heater
power off at warmer temperatures. Damage to the sensor may result from
operation at elevated temperatures.
