Setra System Model 595 - Manual (Page 4)

● Exposed end of cable must be kept free from moisture
● Liquid must not be allowed to freeze in the pressure port.
5.0 Action on Receipt
● Check accessories supplied include Calibration Certificate
● Check details on Calibration Certificate agree with data etched on transducer.
6.0 Installation
The 595 can be put to use in various applications, for example, in tubes or
boreholes wider than one inch in diameter, in wells, open waters, and in non
permanent water carrying riverbeds. The optional sink weight prevents the probe
body from floating to the surface. The pressure probe can be easily fixated in
flowing waters or waters with waves. When designing the measurement location,
observe the hydrodynamic influence of strong currents (>0.5-1 m/s). Depending
on the version and the type of mounting of the individual components, under
pressure or over pressure may occur which may distort the measuring result.
Important: It is not recommended to install the pressure probe in the vicinity of
docks, industrial waste water discharges or areas with high chemical pollution.
The pressure probe is made of high-quality stainless steel and synthetic material.
Nevertheless damaging corrosion may occur, depending on the installation
location. For further information refer to the technical data of the wetted part
materials.
6.1 Lowering the Pressure Probe
6.1.1 First determine the minimum and maximum water levels at the measur-
ing point, for example, with a stuff gauge or contact gauge. Determine
the probe position from these two values. The following prerequisites
must be met:
* Position the probe below the minimal water level
* Difference between maximum water level and probe position <
measuring range of the probe.
6.1.2 Lower the pressure probe at the probe cable to the determined depth.
6.1.3 The cable should be suspended via a suitable cable suspension acces-
sory. The integral Kevlar core provides mechanical strength within the
cable, sufficient to suspend the probe.
6.1.4 Fine adjustment of the probe position may be performed via the probes
digital interface. If the measured value is to be referenced to a zero level,
this can be achieved by adding a user offset. Therefore, in most cases a
coarse positioning of the probe is sufficient. In non permanently water-
carrying riverbeds the pressure probe delivers a zero reading in a dry
condition.
1. Check mA Output Calibration
Acceptable?
2. Check Pressure
Measurement Calibration
Acceptable?
3. Check Temperature
Measurement Calibration
Acceptable?
4. Set Calibration Dates
5. Save Calibration Data
Note: mA output calibration not
necessary for SDI12 operation
Calculate and set
required gain and
slope value
Calculate and set
required gain and
slope value
Calculate and set
required gain and
slope value
N
N
N
Note: Temperature calibration
not necessary for mA output
operation
Y
Y
Y
Figure 1
Recommended Calibration Procedure