Setting Process Purge Flow Using The Nsl (Noise Signal Level) - Mettler Toledo GPro 500 Guía De Instalación Rápida

Quick Setup Guide TDL GPro 500
4 Setting process purge flow using the NSL (Noise Signal Level)
Press the button for Temperature.
If External compensation is selected, then the minimum (4 mA) and maxi-
mum (20 mA) analog output signals from the temperature transducer must
be mapped to the corresponding Analog input of the TDL. Key in the minimum
and maximum values of the temperature in °C.
If Fixed compensation is selected, the fixed temperature value with which the
measurement signal will be calculated has to be keyed in manually. For the
fixed temperature, only °C can be used.
Last, select the initial optical path length corresponding to the probe length
installed:
– 290 mm probe: 200 mm
– 390 mm probe: 400 mm
– 590 mm probe: 800 mm
This initial value is valid when instrument purging on the instrument and on
the process side is running. Depending on the process conditions and after
the optimum of the process purging flow has been found (see Operation
Manual), this value may have to be slightly adapted.
1) Using M400 G2
PATH: H\Config\Measurement\TDL Quick Setup\
• Scroll down and click on the button marked Transmission.
• A window opens showing transmission and NSL values
• Adjust the process purge flowrate while observing the transmission and
NSL values, varying the flowrate up and down to achieve an NSL value
of 40 or lower, while maintaining a good transmission value (> 70%).
• This will achieve the optimal process purge flowrate and best signal
quality.
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