Swan Analytical Instruments AMI Turbiwell, Руководство оператора

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A-96.250.511 / 091120
AMI Turbiwell
Maintenance
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11 Wipe the sample degasser bottom plate with a soft tissue. Make
sure that the gasket is clean.
12 Put the acrylic glass tube onto the base plate.
13 Insert the degasser labyrinth into the acrylic glass tube.
14 Tighten the degasser labyrinth finger tight with the star knob
15 Open the sample flow.
16 Check for leakage.
6.4. Calibration
The AMI Turbiwell is calibrated at the factory using formazine and
the curve is permanently stored in the transmitter. In addition, the
emission intensity of the LED is monitored by an external photodi -
ode. This automatically compensates for an age-related loss of in -
tensity. A recalibration of the AMI Turbiwell is therefore not
necessary.
However, some state regulations require a periodic recalibration of
turbidity measuring instruments. Therefore, a calibration procedure
is described below. To find out whether a periodic recalibration is re -
quired, contact your local regulatory authority.
Note:
The zero point defined during factory calibration is not
changed, but only the slope of the calibration line.
The calibration is performed with a 20 FNU/NTU formazine standard.
To make the formazine standard, the following aids are required:

Deionized water with a turbidity < 0.1 FNU/NTU

Formazine standard 4000 NTU produced according to
EPA 180.1, ASTM 2130B or ISO 7027

The following laboratory equipment