Справочник Пользователя для Hach 900 MAX

Скачать
Страница из 160
Section 4
Page 65
8990sensors.fm
Submerged Pressure Sensor
3.
Place the sensor face up in the bucket or liquid. Tap lightly to remove air 
bubbles. If these bubbles are not removed you can receive false readings 
from the sensor during calibration (
).
Note: Always check the Level 
Adjust when reinstalling the sampler 
following a calibration. (See 
4.
Place the sensor face down under at least 16 cm (6 in.) of water and wait 
20 seconds. Make sure the water surface is calm and the sensor is stable. 
5.
Press any key to continue.
6.
Measure the depth from the bottom of the bucket to the surface of the 
water and enter the value using the numeric keypad (
).   
7.
Press 
ACCEPT
.
Figure 17
Calibrating the Submerged Area/Velocity Sensor
4.3 Submerged Pressure Sensor
The submerged pressure sensor is a pressure transducer that contains a 
titanium diaphragm. As the water pressure increases, (with increasing level in 
the flow stream) the diaphragm is deflected, or pushed, against a solid state 
device called a strain gauge. The strain gauge converts the pressure against 
the diaphragm to a voltage. As the level in the flow stream increases, the 
voltage coming from the submerged pressure sensor increases. The voltage 
is read by the microprocessor in the Sampler at a regular interval and 
converted to a number which represents the level in the flow stream. The level 
reading can then be converted by the meter to a flow rate based on the 
mathematical formula for the selected primary device.
4.3.1 Submerged Pressure Sensor Connection
The submerged pressure sensor connection is located on the left side of the 
controller housing and is labeled submerged pressure sensor. The connector 
is keyed and can only be inserted in the proper orientation (key up).