parameter, P-70 or by pressing the “7" calibrator key while in the RUN mode. The
amount of P-68 and P-69 damping should be equal to or greater than the rates of level
change encountered in P-70. The process rate averaging parameter P-71 selects the
method of averaging used to determine the process rate display, however it has no
bearing on the damping function.
Damping is often used to slow down the rate of response of the display especially
where liquid surfaces are in agitation or material falls into the sound path during filling.
When in the calibrate mode, the damping is automatically overridden to give fast
response when “MEAS” is pressed. In the RUN mode, the response can be further
increased by turning the fuzz filter (P-72) and agitator discriminator (P-73) OFF - ONLY
if they are not required.
If the transducer aiming is being adjusted while in the run mode, it is suggested that
damping be at its factory setting of 10 to start. The damping can later be changed to
suit prevailing conditions.
Upon a loss of echo condition and after the fail-safe timer (P-75) expires, the display will
go to fail-safe high at the fill damping rate if P-74 = 1 or to fail-safe low at the empty
damping rate if P-74 = 2.
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 HydroRanger I and the integral ST-H 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: 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 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 HydroRanger I instead of using the remote sensor input by one of
the following methods:
1. » set 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 jumper ‘J2’ to ‘TS/P65’
» insure that the temperature sensor input TB1 - 5/6 is left open/unconnected
PL-399 5 – 2
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