LEYBOLD THERMOVAC TTR 91 R, Руководство по эксплуатации

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14 300710168_002_C1 - 01/2018 - © Leybold
Set-point adjustment
When the ‘S/P’ button is pushed the gauge output will change. Do not push the ‘S/P’ button to adjust the set- point if
the change in output could cause a malfunction of your system.
Note: If you use a Leybold Controller the TTR 91 R set-point is not used.
To read the pressure at which the set-point output turns on, push the "S/P" button with an appropriate tool. The signal
output of the gauge will change to indicate the set-point threshold for three seconds after which the output will return
to normal.
The set-point has a fixed hysteresis of 500 mV. When the measured pressure falls below the set-point pressure the
transistor output changes to ON (closed). The transistor output will turn OFF when the measured pressure rises to
500 mV above the set-point pressure. An external relay connected as shown in section 4 will turn on when the
pressure falls below the set-point and turn of when the pressure rises to 500 mV above the set-point.
To adjust the set-point threshold push the "S/P" button and hold it down for more than three seconds. The threshold
value will increase steadily. Release the button when you reach the required value. To make finer adjustment release
the button just before the required value is reached and immediately push the button as many times as required.
Each time you push the button the threshold value will increase by 10 mV. If during adjustment the threshold reaches
the maximum value (10.0 V) it will jump to the minimum (1.4 V) and increase again.
If you do not need to use the set-point or if you require the set-point to be permanently off, you can adjust the
threshold to 1.4 V. This will ensure that the set-point does not operate. The TTR 91 R is shipped from the factory
with the threshold set to 1.4 V.
The set-point can also be used to indicate that the gauge is operating correctly. If you adjust the threshold to 10.0 V
then the set-point output will be ON as long as the gauge is operating correctly and will turn OFF if an error is detected
Adjusting the set-point
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Attention
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