Hach Sigma 950, Инструкция по эксплуатации инструмента

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Sensor Installation
Figure 5 Remote Ultrasonic Sensor Option
6.1.3 Downlooking Ultrasonic Depth Sensor Calibration
Calibrate the current water level via one of two methods; Liquid Depth or Sensor Height.
An Invisible Range can also be set which allows the transducer to ignore reflections from
obstructions between the sensor and the water surface, such as ladder rungs, channel
side walls, etc. Each method has its own advantages and disadvantages; selecting the
proper method will depend upon the site conditions. Calibrate the ultrasonic sensor each
time the sensor is installed at a new site.
6.1.3.1 Liquid Depth
This method requires the depth of liquid in the channel that is contributing to flow. In a
round pipe, the entire depth typically contributes to flow. In a weir, only the depth that is
flowing over the weir plate contributes to flow. Many flumes have specific requirements,
refer to
Working with Primary Devices on page 105 . Level Depth calibration is primarily
used when:
Access is available to the primary device for a physical measurement of the liquid depth,
and when water is flowing during installation of the 950
Flow Meter (channel is not dry).
Note: Always re-check the Level Adjust when re-installing the flow meter.
1. From the Main Menu, select
OPTIONS>ADVANCED OPTIONS>
CALIBRATION>ULTRASONIC SENSOR.
2. Select Calibrate U-Sonic using the
UP
and
DOWN
soft keys. Press
SELECT
.
1 Enclosure 13.97 x 22.86 x 4.0 cm (5.5 x 9.0 x 4.0 in.) 3 To flow meter 5 Cable (P/N 2716)
2 Customer-supplied conduit to 950 flow meter. 4 Cable (P/N SE 818) 6 Ultrasonic Transducer
RED
BLK
GRN
BLK
RED
WHT
J5
J4
J2
J3
Shield
Clear
1
2
3
4
5
6