Hach LANGE ULTRATURB sc, Руководство по эксплуатации

Страница: 58 / 73

Maintenance
53
6.4 Replacing desiccant
The ULTRATURB sc turbidity sensor is continuously subject to a wet
environment. To provide protection against the moisture, there are 2 generously
sized desiccant bags close to the optical and electronic components. To maintain
this protection, the manufacturer recommends replacement or regeneration every
2 years.
To replace the desiccant, open the housing and replace the two desiccant bags, 4
units (1) and 0.5 units (2) as per the figure.
6.5 Monitoring test equipment
As part of a quality assurance system for test equipment monitoring, it is
necessary to check the instrument calibration; this can be performed using a
formazine standard series in accordance with DIN EN ISO 7027.
You can either make up the formazine solution yourself as per the instructions
that follow in Sec. 6.5.1 or procure it from the manufacturer (LCW 813 or Stabl
Cal).
1. To check the instrument calibration, first thoroughly rinse out the measuring
chamber using distilled water.
2. Prepare a turbidity series using formazine reference solutions as per DIN EN
ISO 7027; the measuring series should correspond to the measuring range
selected. For example, in the measuring range FNU 0 - 5.0 chose reference
solutions with FNU 0.5 - 1.0 - 2.0 - 3.0 - 4.0.
客服：400 688 9809