TEMPERATURE COMPENSATION
In order to provide compensation for uniform temperature variances of the sound
medium, temperature compensation is provided. Temperature compensation consists
of on board circuitry in the MultiRanger Plus and the integal (transducer) temperature
sensor. The integral temperature sensor uses the transducer’s wiring and input
terminals (TB1 - 8/9) to interface with the on board circuitry. Note: board ‘B’ jumper
‘J2’ must be set to ‘TRANS’.
Optionally, the alternate TS-3 Temperature Sensor can be used to provide a
temperature input, rather than by using the integral temperature sensor.
In order to do this:
» set board ‘B’ jumper ‘J2’ to ‘TS / P65’
» optional TS-3 Temperature Sensor must be connected to TB1 - 5/6/7
If the temperature of the sound medium is to remain constant, compensation may be
programmed into the MultiRanger Plus instead of using the remote sensor input by
one of the following methods:
1. » set board ‘B’ jumper ‘J2’ to ‘TS / P65’
» insure that the temperature sensor input TB1 - 5/6 is left open/unconnected
» select P-65
» enter temperature in °C
2 » set board ‘B’ jumper ‘J2’ to ‘TS / P65’
» insure that the temperature sensor input TB1 - 5/6 is left open/unconnected
- select P-61
- perform an empty calibration
The following temperature functions (in °C) can be viewed:
P-65 air temperature » present temperature at sensor
or
» programmed temperature, if sensor not used
P-66 max. air temperature » highest temperature encountered during operation
P-67 min. air temperture » lowest temperature encountered during operation
SOUND VELOCITY
The MultiRanger Plus can be calibrated for transducer operation in homogeneous
vapours with sound velocities other than that of air.
The basis is to physically measure the level (measuring tape or sight glass) and enter
this value via P-61. The MultiRanger Plus then calculates the sound velocity by
comparing the entered physical measurement to its own ultrasonic measurement
(empty calibration, P-61)
PL-443 5 – 2
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