Hach 900 MAX - Manual (Page 65)

Section 4
Page 63
8990sensors.fm Submerged Area/Velocity Sensor
4. Select either inches or centimeters using the CHANGE UNITS key. The
distance must be greater than the minimum deadband of 10 in. (25.4 cm)
for the 75 kHz sensor and 15 in. (38.1 cm) for the 50 kHz sensor.
5. Press ACCEPT when finished.
4.2 Submerged Area/Velocity Sensor
The Submerged area/velocity sensor simultaneously measures level
and velocity.
4.2.1 Submerged Area/Velocity Sensor Connection
Recommended Routing of Submerged Area/Velocity Cable
Proper routing of the cable serves two functions:
• Keeps the in-line desiccant assembly inside the cover and out of the way
when installing and removing the sampler from tight manholes.
• Keeps the desiccant out of direct contact with the elements. Also, keeps
water from dripping directly onto the desiccant assembly.
To secure the submerged area velocity cable, route the cable around the
battery and clip it under the battery hold downs.
4.2.2 Submerged Area/Velocity Sensor Programming
1. From the Main Menu, select OPTIONS>LEVEL SENSOR.
2. Select Submerged Xducer using the CHANGE CHOICE key. Press
ACCEPT .
3. From the MAIN MENU , select SETUP>MODIFY SELECTED ITEMS.
4. Highlight Velocity Direction using the UP and DOWN keys. Press SELECT .
5. Set the velocity direction (upstream, downstream, or always positive)
using the
CHANGE CHOICE key. Press ACCEPT to continue.
6. Highlight Velocity Units using the UP and DOWN keys. Press SELECT .
Table 5 Submerged/Area Velocity Sensor Connection
Pin Signal Description Wire Color Bare Leads
A +12 V dc Red Red
B ground Green Green
C Receive (ground) B/W Shield Yellow
D Receive (+) B/W Center Orange
E Transmit (ground) Black Shield Violet
F Transmit (+) Black Center Gray
G Depth (-) Black Black
H Depth (+) White White