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21
O&M Manual
Rev-H (8/11)
Part 5 - Configuration
The electronics for the Turbidity system are designed to be as flexible as possible. A number of
programming functions are provided in the CONFIGURATION menu and are protected by an access
number, which must be entered to allow changes in these settings. Some settings are for factory use
only, while others are used for customer selection of certain operating parameters.
Press the MODE key until the display reads CONFIGURATION and then press CAL. The display
will read "KB UNLOCKED (OR LOCKED)". Press ENTER twice and the display will read "ACCESS NR.:
0". To gain access to the configuration routines, the access number must be entered using the UP or
DOWN keys. The default access number is 0, so you can enter the configuration menu by simply
pressing ENTER. This number is programmable and can be set to any 3 digit number desired.
Remember to record any custom access number entered into the unit in a location where you can always
find it. Should you loose your access number, call ATI for assistance with a bypass sequence.
1. Measure U.: NTU This routine allows selection of the measurement units displayed on the
monitor. The default units are NTU (nephelometric turbidity units). For special applications, the
monitor can display values in terms of milligrams per liter SiO
2
or mg/l PSL (Polystyrene Latex
Spheres). When using these alternate units, the customer must provide a calibration media that
fits the application.
2. PSL (or SiO2)/NTU F: X.XXX This display will appear only if the measuring units selected in 1
above are either PSL or SiO2. For these measurement units, the turbidity sensor measurement is
converted into these units by applying a multiplier. For PSL measurement, this multiplier may be
adjusted from 1.000 to 1.200 and the default value is 1.164. For SiO2, the multiplier is adjustable
from 2.500 to 3.500 and the default value is 2.500.
3. Input: TU81XX ISO: This routine is used to select the type of sensor connected to the monitor.
The A15/76 is capable of operating with both EPA style sensors using tungsten filiment lamps or
ISO type sensors using an LED light source. TU81XX is the code for the ISO sensor version and
TU82XX is the code for the EPA sensor version.
4. Range: 4/400 NTU (Note: This display does not appear if the EPA style sensor is used.)
Selection of the overall operating range is done in this routine. For most low range applications,
the default values of 4/400 should be used. This allows for selection of ranges between 0-4 and
0-400 NTU. For high range applications, select 40/4000. This allows the unit to monitor in the 0-
4000 NTU range for high level applications. Select 9/999 or 99/9999 when using the mg/l or PPM
ranges.
5. Scale: 4.000 NTU This routine allows selection of the actual operating range to be used. Filter
effluent applications will normally use the 0-4.000 range while raw water or filter influent
monitoring will normally use either 0-40.00 or 0-400.0 ranges
6. AUTORANGING: OFF The monitor is capable of automatically switching the display range if
turbidity values exceed the range selected in #4 above. The default is OFF. If you want to see
values above the selected range, use the UP or DOWN keys to select ON.
7. Large S RT: 40s This routine allows for electronic damping of the display and analog output
signals. The A15/76 has a two-stage filter to eliminate rapid changes in the display. This routing
selects the damping used for large changes in turbidity. The default setting is 40 seconds, which
means that it takes about 40 seconds for the display and output to reach 95% of a large step
change in turbidity value. This value can be adjusted between 5 and 220 seconds for either faster
or slower response times.
- Model A15/76 1
- PRODUCT WARRANTY 2
- TABLE OF CONTENTS 3
- TABLE OF FIGURES 4
- Unpacking 5
- Part 1 - Introduction 6
- Specifications 7
- Electronics Unit 7
- SIDE VIEWFRONT VIEW 8
- DC Powered Monitor 17
- Part 4 – Start-Up 19
- Front Panel Lock 20
- Part 5 - Configuration 21
- Part 6 - Operation 24
- Setting Sensitivity (Span) 25
- Controls & Alarm Outputs 27
- Analog Output Adjustment 28
- Simulate Mode 29
- Check Signal Display 30
- Part 7 - Maintenance 31
- SPARE PARTS LIST 32
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