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Analytical Technology A15 Owner's Manual

Turbidity monitor
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Home Office
Analytical Technology, Inc.
6 Iron Bridge Drive
Collegeville, PA 19426
Ph:(800) 959-0299
(610) 917-0991
Fax: (610) 917-0992
Email: sales@analyticaltechnology.com
Model A15/76
Turbidity Monitor
European Office
ATI (UK) Limited
Bank Chambers, 33 Stamford St.
Mossley, Ashton-u-Lyne OL50LL
Ph: 0800-018-4020
+ 44 (0) 1457 832800
Fax:+ 44 (0) 1457 839500
Email:sales@atiuk.com

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  • Page 1 Model A15/76 Turbidity Monitor Home Office European Office Analytical Technology, Inc. ATI (UK) Limited 6 Iron Bridge Drive Bank Chambers, 33 Stamford St. Collegeville, PA 19426 Mossley, Ashton-u-Lyne OL50LL Ph:(800) 959-0299 Ph: 0800-018-4020 (610) 917-0991 + 44 (0) 1457 832800...
  • Page 2 PRODUCT WARRANTY Analytical Technology, Inc. (Manufacturer) warrants to the Customer that if any part(s) of the Manufacturer's products proves to be defective in materials or workmanship within the earlier of 18 months of the date of shipment or 12 months of the date of start-up, such defective parts will be repaired or replaced free of charge.

  • Page 3: Table Of Contents

    Setting Sensitivity (Span) ......................22 CONTROL & ALARM OUTPUTS ......................23 Control Relays..........................23 Alarm Relay..........................24 Auto/Manual Operating Mode ......................24 Check Signal Display ........................25 MAINTENANCE ............................26 Sensor Maintenance ........................26 SPARE PARTS LIST - MODEL A15/76....................27 O & M Manual Rev. E, 09/06 -3 -...

  • Page 4: Unpacking

    Compare the contents of the shipping container with the packing list. The items listed above are the standard components that are included with every standard A15/76 Turbidity monitor. Any other items will be listed separately on the packing list. Check the contents of the shipping container carefully to insure that nothing is overlooked.

  • Page 5: Introduction

    Model A15/76 Turbidity Monitor INTRODUCTION The Model A15/76 is an on-line monitoring system designed for the continuous measurement of the turbidity of an aqueous stream. It is primarily intended for monitoring turbidity in drinking water or wastewater effluent. The monitor provides display ranges from 0-4.000 NTU up to 0-4000 NTU. The display range used for a given application is user programmable, and an auto-ranging feature allows the display of high turbidity values, even when programmed for low range use.

  • Page 6: Specifications

    Model A15/76 Turbidity Monitor SPECIFICATIONS Electronics Unit Range: 4/400 NTU (0-4.000, 0-40.00, 0-400.0) 40/4000 NTU (0-40.00, 0-400.0, 0-4000) 9/999 mg/l (or PPM) SiO (0-9.999, 0-99.99, 0-999.9) 99/9999 mg/l (or PPM) SiO (0-99.99, 0-999.9, 0-9999) Auto-ranging over 3 decades of concentration Sensor Type: 90°...

  • Page 7: Installation

    Model A15/76 Turbidity Monitor INSTALLATION The main installation requirements for ATI’s Turbidity Monitor are mechanical installation, and connection of power to the monitor. Figure 1 on page 5 shows a schematic of a typical installation of a complete system. The monitor should be located near the sensor in order to use the standard 30 foot sensor cable supplied with the system.
  • Page 8 Model A15/76 Turbidity Monitor The optional NEMA 4X wall mount enclosure is a Molded Plastic ABS unit that bolts directly to a wall or other flat surface. The enclosure is supplied with special mounting bracket for convenience in mounting the enclosure.

  • Page 9: Figure 4 - Handrail Mounting Assembly For Nema 4X Enclosure (Ati-043)

    Model A15/76 Turbidity Monitor A special handrail mounting kit (part # 00-0930) is available from ATI for use on standard handrails found around many process tanks. The mounting kit consists of two vertical aluminum supports, which are clamped to the handrail with stainless steel u-bolts. The vertical supports are drilled for connection to horizontal handrails with 18"...

  • Page 10: Figure 5 Flowcell Dimensions (Ati-0435)

    Model A15/76 Turbidity Monitor The majority of turbidity applications require the use of a flowcell assembly. This method is best when monitoring very low turbidity values, such as filter effluent. The flowcell used with ATI’s turbidity system is designed to eliminate ambient light effects, and to allow sample pressure to be maintained through the flowcell minimizing air bubble formation that can cause erroneous turbidity measurements.
  • Page 11 Model A15/76 Turbidity Monitor Figure 7 below shows the recommended installation tubing arrangement for the turbidity system. A 3- way valve is supplied to facilitate calibration of the turbidity monitor. Install the valve as shown below so that turbidity standards can easily be introduced into the flowcell.
  • Page 12 Model A15/76 Turbidity Monitor Turbidity sensors may also be installed directly into a flowing pipe system provided that the water does not contain a lot of entrained air. It is best to install the sensor in a vertical pipe section with water flowing upward.
  • Page 13 Model A15/76 Turbidity Monitor FIGURE 9 – FLOW TEE ASSEMBLY (ATI-0542) O & M Manual Rev. E, 09/06 -13 -...

  • Page 14: Figure 10 - Submersible Sensor Mounting (Ati-0447)

    Model A15/76 Turbidity Monitor For applications where a submersible turbidity sensor is to be used, a special submersion holder is supplied. This holder is designed to mount on the end of a 1” mounting pipe, with the sensor cable coming up through the center of the pipe.

  • Page 15: Electrical Connections

    ELECTRICAL CONNECTIONS Wiring connections to the A15/73 are made to the back of the monitor. The terminal blocks on the back of the monitor are pluggable terminals for ease of wiring. Power and alarm relay connections are made to the lower terminal block while sensor and analog output connections are made to the upper block.
  • Page 16 Model A15/76 Turbidity Monitor FIGURE 12– TURBIDITY SYSTEM WITH JUNCTION BOX CONNECTIONS (ATI-0445) O & M Manual Rev. E, 09/06 -16 -...

  • Page 17: Start-Up

    Model A15/76 Turbidity Monitor START-UP Prior to operation, recheck electrical connections to be sure everything is in accordance with Figure 11 or 11 in the previous section. If everything is in order, power may be applied. When power is turned on, the display will come up with a program and version number, which will remain on the display for a few seconds.

  • Page 18: Front Panel Lock

    Model A15/76 Turbidity Monitor Front Panel Lock The key switches on the front panel of the monitor can be used for both changing the display and for calibrations and setpoint adjustments. When the monitor is shipped from ATI, all functions are accessible.

  • Page 19: Configuration

    5. 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.
  • Page 20 B as described above. 15. EXT LIGHT AL: OFF The A15/76 turbidity monitor can detect when external light conditions are too high to allow for accurate readings. This is especially important when measuring very low turbidity values. This routine activates or deactivates this alarm feature.

  • Page 21: Operation

    Model A15/76 Turbidity Monitor OPERATION Turbidity monitors will start to measure aqueous samples as soon as power is applied. Calibration of a turbidity system is normally required at start-up, but factory settings are likely to be fairly accurate, so it is often OK to start up the montor without adjustment.

  • Page 22: Setting Sensitivity (Span)

    Model A15/76 Turbidity Monitor Setting Sensitivity (Span) Adjusting the span of a turbidity system requires the use of either a mixed turbidity standard or comparison with a reliable portable meter. Formazin turbidity standards can be prepared using reagent solutions available from Fisher Scientific or other lab supply companies. The chemicals required are Turbidity Standard 1 (Formazin Sulfate, 1%, Fisher part #LC26300-7) and Turbidity Standard 2 (Hexamethylenetetramine, 10%, Fisher part # LC26320-7).

  • Page 23: Control & Alarm Outputs

    CONTROL & ALARM OUTPUTS The A15/76 Turbidity Monitor is equipped with three relay outputs. Two of these outputs are designated control relays and the third is designated as an alarm relay. These output relays may be used in a variety of ways, and the function of each relay is programmable by the operator.

  • Page 24: Alarm Relay

    Auto/Manual Operating Mode The A15/76 will normally operate in AUTO mode. In this mode, the monitor will display turbidity values and indicate any alarms as described previously. However, a “Manual Mode” of operation is selectable in order to allow the user to activate the A and B relays manually for test purposes.

  • Page 25: Check Signal Display

    Model A15/76 Turbidity Monitor Check Signal Display The check signal display (D3, page 16), is a display routine used to provide an indication of the condition of the sensor. The check signal value will decrease as any types of deposits foul the sensor. If the sensor becomes dry due to loss of sample flow, the check signal value will go to a high number.

  • Page 26: Maintenance

    Model A15/76 Turbidity Monitor MAINTENANCE The A15/76 Turbidity Monitor will generally provide unattended operation over long periods of time. With proper care, the system should continue to provide measurements indefinitely. For reliable operation, maintenance on the system must be done on a regular schedule. Keep in mind that preventive maintenance on a regular schedule is much less troublesome than emergency maintenance that always seems to come at the wrong time.

  • Page 27: Spare Parts List - Model A15/76

    Model A15/76 Turbidity Monitor SPARE PARTS LIST - MODEL A15/76 PART NO. DESCRIPTION 00-0804 Complete turbidity monitor electronics, panel mount 03-0181 NEMA 4X enclosure assembly 63-0036 Turbidity sensor 63-0037 Turbidity sensor cable, 30 ft. 63-0038 Turbidity sensor flowcell assembly 00-0726...

This manual is also suitable for:

A76A15/76

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