Siemens HydroRanger 200 HMI, Operating Instructions Manual

Page: 46 / 404

Connecting
5.7 Temperature sensor
HydroRanger 200 HMI
44
Operating Instructions, 06/2018, A5E36281317-AC
5.7 Temperature sensor
Accurate temperature readings are critical to accurate level measurements because the
speed of sound changes, depending on air temperature, and all Siemens Echomax and ST-
H transducers have an internal temperature sensor.
Having a separate TS-3 temperature sensor will ensure optimum accuracy if the following
conditions apply:
● The transducer is exposed to direct sunlight (or other radiant heat source).
● The transducer face and monitored surface temperature differs.
● Faster response to temperature changes is required.
To achieve the best performance of temperature measurement in a typical open channel
flow application, the temperature sensor should be shielded from direct sunlight and
mounted halfway between the ultrasonic transducer face and the maximum head achievable
in the application. Care should be taken to avoid obstructing the direct sound path of the
ultrasonic transducer.
Note
Use a TS-3 Temperature Sensor only. Leave terminals open (unused) if TS-3 is not
deployed.
5.8 mA input
For more information, consult parameters Transducer (2.1.5.) (Page 164), mA input range
(2.6.1.) (Page 184), 0/4 mA level value (2.6.2.) (Page 184), and 20 mA level value (2.6.3.)
(Page 184).