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Waltron AQUALERT mAI-9070 Series Instruction Manual

Water chemistry measurement & control hydrazine monitor
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Waltron LLC
AQUALERT
DIVISION
___________________________________________
Water Chemistry Measurement & Control
µAI-9070 SERIES
HYDRAZINE MONITOR
INSTRUCTION MANUAL

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Summary of Contents for Waltron AQUALERT mAI-9070 Series

  • Page 1 ® Waltron LLC AQUALERT DIVISION ___________________________________________ Water Chemistry Measurement & Control µAI-9070 SERIES HYDRAZINE MONITOR INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    Concentrated ammonia solution - 2 liters ................24 6.1-2 STANDARD SOLUTIONS......................24 6.1-3 NITRIC ACID CLEANING SOLUTION ................26 Note: Waltron L.L.C. offers Nitric Acid in a 2 ounce size part number H1234-556 ......26 6.1-4 HYDRAZINE SENSOR RECHARGE GEL................. 26 SCHEDULED SERVICING ......................26...
  • Page 3 TABLE OF CONTENT 6.2-1 BI- WEEKLY......................... 26 6.2-2 BI-MONTHLY........................27 6.2-3 QUARTERLY ........................27 6.2-4 REFURBISHING THE SENSOR ..................27 SHUT DOWN PROCEDURE ...................... 28 6.3.1 STORAGE OF THE SENSOR..................... 29 UNSCHEDULED SERVICING....................29 6.4.1 Display shows “CAL”: ......................29 6.4.2 Display flashes (reading) - “out”:..................

  • Page 4: Introduction

    1 INTRODUCTION 9070 1 INTRODUCTION 1.1 GENERAL The µAI-9070 Hydrazine Analyzer is a continuous on-line monitor for direct measurement of Hydrazine in boiler feedwater. The 9070 features low maintenance, semi-automatic process or standard calibration; and high accuracy, auto ranging and external (“grab”) sample analysis. DESCRIPTION 1.2.1 SENSOR UNIT...
  • Page 5 1 INTRODUCTION 9070 To interpret and to display a reading of hydrazine received from the sensor unit, To control the calibration sequence, To provide various outputs to the remote equipment. Displays are three-digit, seven-segment, light emitting diodes (l.e.d.), which show the level of hydrazine and operational information as well. The operator can see when the instrument is in the calibration mode, and when the calibration has not been successful.

  • Page 6: Installation

    2 INSTALLATION 9070 2 INSTALLATION 2.1 MOUNTING OF UNIT 2.1.1 LOCATION AND LAYOUT Mount the sensor and transmitter units in a clean, vibration-free area, avoiding direct radiant heat, sunlight and drafts. Avoid areas containing chlorinating equipment. Mount the sensor unit no more than 33 feet (10 meters) from its associated sample coolers.

  • Page 7: Transmitter Units

    2 INSTALLATION 9070 FIGURE 2.2 SENSOR UNIT DIMENSIONS AND INSTALLATION 2.1.2 TRANSMITTER UNITS Wall mount using four 5/16” or ¼” bolts on 9.06” by 9.06” centers. Sufficient access space, as detailed previously, must be left for making cable connections to the transmitters and for the mounting of standard solution containers.
  • Page 8 2 INSTALLATION 9070 FIGURE 2.3 TRANSMITTER UNIT DIMENSIONS AND INSTALLATION For access and fitting of the transmitter unit, proceed as follows: Unlock the door and open fully. To release the face panel, use a small coin or similar tool to turn the four plastic fasteners ¼...

  • Page 9: Sample Requirements

    2 INSTALLATION 9070 With the transmitter case secured to a wall or panel, open the chassis to the case and wire the main power connection. Fit the connection blocks onto the circuit boards. Fit the chassis unit, secure it with the captive screws and replace any ground (earth) bonding leads.

  • Page 10: Electrical Connections

    2 INSTALLATION 9070 2.4 ELECTRICAL CONNECTIONS WARNING: Although some instruments have internal fuse protection, you must use a suitably rated external protection device, such as a fuse or miniature circuit breaker (MCB). Switch off the power supply and any high-voltage operated control circuits before making any connections.

  • Page 11: Wiring Of Boards

    2 INSTALLATION 9070 Make sure the interconnect cable from the sensor unit is long enough to reach the transmitter easily. The cable should terminate on terminal block TB3 on the analog board. Push the end of the cable through a gland in the left-hand side of the transmitter case.
  • Page 12 2 INSTALLATION 9070 Analog Board TB1 Analog Board TB2 Analog Board TB3...

  • Page 13: Chassis

    2 INSTALLATION 9070 PSU Board TB3 Chassis A voltage selector is next to the power supply terminal block. Set this voltage selector to the correct voltage before connecting the instrument to the power supply. Make sure that all of the gland nuts are tightened. Warning: Connecting the power supply ground (earth) ensures the safety of your personnel, the reduction of the effects of Radio Frequency Interference (RFI), and the correct operation of the power supply interference...
  • Page 14 2 INSTALLATION 9070 Use a resistor network to achieve the suitable range recorder input. Connect the resistors as shown in the two examples in Fig. 2.5. (Our example consists of four ¼-watt resistors). A suitable resistor network kit is listed in Section 7. Your external equipment should be set up using the manufacturers’...

  • Page 15: Start Up

    3 START UP 9070 3 START UP Open the transmitter unit’s door and remove the face panel. Verify that the switch next to the battery is set to “ON”. Replace the face panel and secure it with the four plastic fasteners. Power up the monitor at the external source and set the Range Switch to “AUTO”.
  • Page 16 3 START UP 9070 Set up the transmitter as described in Section 4.2. Carry out a calibration as detailed in Section 5. The monitor is now in operation. The lamp adjacent to the number display indicates the hydrazine level (units of measurement in ppb) or the sample temperature (in degrees Celsius).

  • Page 17: Principle Of Operations

    4 PRINCIPLE OF OPERATIONS 9070 4 PRINCIPLE OF OPERATIONS 4.1 SENSOR UNIT 4.1.1 A flow schematic is shown in Fig. 4.1. The sample enters the compression fitting at the bottom of the case and passes through one half of a heat exchanger. This heat exchanger, used during the calibration sequence to bring the standard solution temperature close to the temperature of the sample solution, minimizes calibration time.

  • Page 18: Qa/Qc Junction Box Switch

    4 PRINCIPLE OF OPERATIONS 9070 A temperature sensor, fitted into the hydrazine sensor, detects the sample’s temperature. The sensor, connected to the transmitter unit, compensates for changes in output from the electrode pair over a range of 41 ° F to 131 ° F (5 ° C to 55 °...

  • Page 19: Transmitter Unit

    4 PRINCIPLE OF OPERATIONS 9070 4.3 TRANSMITTER UNIT 4.3.1 ELECTRONICS CHASSIS The chassis contains three circuit boards: Digital Board - Behind the faceplate, containing the central processor unit, front panel controls and the display. Analog Board - Middle board, containing the analog input and current output circuitry.

  • Page 20: Front Panel Controls

    4 PRINCIPLE OF OPERATIONS 9070 FIGURE 4.3 LOCATION OF ITEMS ON DIGITAL BOARD 4.3.3 FRONT PANEL CONTROLS The controls, mounted on the front circuit board in the chassis, protrude through holes in the faceplate. Four plastic fasteners secure the chassis to the faceplate. A three-digit, red, l.e.d.
  • Page 21 4 PRINCIPLE OF OPERATIONS 9070 FIGURE 4.4 TRANSMITTER UNIT FRONT PANEL 1. RANGE switch ← : Positions “1”and “2” are the manual ranges within the three-decade analyzer range. Position 3 (AUTO) automatically switches to a range suitable for the hydrazine level being measured within the overall instrument range.
  • Page 22 4 PRINCIPLE OF OPERATIONS 9070 4. STD ↓ : Use this control in conjunction with SET VALUE ( ⇑ and ⇓ arrows) buttons to set the value of the standard solution into the instrument. The minimum value that one can enter for a standard solution is 20ppb. 5.

  • Page 23: Alarms

    4.3-4 ALARMS Note . The alarms cannot be set during a calibration sequence. Waltron, L.L.C. has provided two hydrazine concentration alarm control relays, each having one pair of changeover contacts rated at 2A, 250Vac (non-inductive). Alarms 1 and 2 are designated as low and high alarms respectively. Display these values by pressing the appropriate buttons on the front panel, and adjust by pressing the “SET VALUE”...
  • Page 24 4 PRINCIPLE OF OPERATIONS 9070 The range selection only refers to the current output, as the digital display covers the full range capability of the monitor. If the concentration exceeds the selected range or instrument range, the digital display flashes - (reading) - “out” - (reading) - “out”. In every other way, the monitor functions normally.

  • Page 25: Calibration Procedure

    5 CALIBRATION PROCEDURE 9070 5 CALIBRATION PROCEDURE Before starting an automatic calibration sequence, rinse the solution containers with high-purity water and fill them with fresh standard solution. Perform a calibration weekly. In cases where a weekly calibration is not necessary, determine a suitable schedule to suit the operation conditions. 5.1 SINGLE POINT CALIBRATION USING STANDARD SOLUTION •...

  • Page 26: Calibration Using Process Sample As A Standard Solution

    5 CALIBRATION PROCEDURE 9070 5.2 CALIBRATION USING PROCESS SAMPLE AS A STANDARD SOLUTION Place junction box selector switch to “PROC. CAL” position.

  • Page 27: Maintenance

    . In warm weather, pressure increases in the bulk container of ammonia: Release the cap carefully . Waltron L.L.C. recommends a 35% w/v solution (0.88 s.g), but you can use concentrations to a minimum of 30% w/v (0.89 s.g.).
  • Page 28 6 MAINTENANCE 9070 Note: Waltron L.L.C. offers Hydrazine Standard 1000 ppm in a 1 liter size part number H1234-060 Dissolve 4.058( ± 0.001)g of analytical reagent grade Hydrazine Sulfate ) in approximately 800ml high purity water. Transfer this solution to a one-liter volumetric flask and make up to the 1-liter mark with more high purity water to give a stock solution of 1000ppm Hydrazine.

  • Page 29: Nitric Acid Cleaning Solution

    9070 6.1-3 NITRIC ACID CLEANING SOLUTION Note: Waltron L.L.C. offers Nitric Acid in a 2 ounce size part number H1234-556 Use this for refurbishing the sensor. This solution will clean the platinum anode and silver cathode. The cleaning solution is a 25% nitric acid aqueous solution.

  • Page 30: Bi-Monthly

    6 MAINTENANCE 9070 6.2-2 BI-MONTHLY Replace the bottle of Buffer solution. Do not allow the level of solution to fall below about three-quarters full. On low, ambient temperature, the solution may require replacement more frequently. 6.2-3 QUARTERLY Check the condition of all plastic tubing; replace as required. Refurbish the sensor.

  • Page 31: Shut Down Procedure

    6 MAINTENANCE 9070 Caution: Do not remove too much of the syringe tip. The syringe tip will no longer fit into the outer-jacket-filling hole. Slowly inject the filling gel through the bottom hole in the outer jacket of the sensor until the gel reaches to top hole. Remove the syringe and set it aside.

  • Page 32: Storage Of The Sensor

    6 MAINTENANCE 9070 Switch off the main power supply to the Transmitter Unit. FIGURE 6.1 HYDRAZINE SENSORS 6.3.1 STORAGE OF THE SENSOR Remove the sensor from the sample panel. Disassemble sensor outer jacket from center ceramic assembly. Clean the sensor of any gel. The sensor can be stored as a dry item.

  • Page 33: Display Flashes (Reading) - "Out

    6 MAINTENANCE 9070 6.4.2 Display flashes (reading) - “out”: Sample concentration exceeds the range group selected. 6.4.3 Display shows “CF”: “CF” stands for “Calibration Fail”: - the monitor was NOT able to calibrate. 6.4.4 Display flashes “reading” continuously. Cell output near calibration failure. System will require attention soon.

  • Page 34: Malfunctions Of The Monitor

    6 MAINTENANCE 9070 6.4.7 MALFUNCTIONS OF THE MONITOR These may produce many effects after calibration, some of which produce the following: Abnormal slope % values - see Section 4.2. Display alternates between (value) and “out”. A very large offset from the sensor takes the reading beyond the range of the monitor.
  • Page 35 6 MAINTENANCE 9070 FIGURE 6.2 PART NUMBERS OF PLASTIC TUBING...

  • Page 36: Sprare Parts

    7 SPARE PARTS 9070 7 SPRARE PARTS H3010-165 Hydrazine Detection Cell H3500-315A Refill Syringe of Gel H3500-341 Internal Retubing Kit K1092-025 Fuse, 2A Ceramic H3500-338 Hydrazine Expendable Kit K2014-419B Digital Circuit Board complete with controls & display K2014-401C Analog Circuit Board K2014-402B Pow er Supply Circuit Board K3500-201...

  • Page 37: Specifications

    8 SPECIFICATIONS 9070 8 SPECIFICATIONS Ranges 0 to 99.9ppb or 0 to 999 ppb. For concentrations under 500ppb: ±5% of reading or ±2ppb, whichever is Accuracy greater. For concentrations above 500ppb: Better than ±10% of reading. Sensor Response Time 90% of a step change in less than 1 minute. Stability 5% of reading or 2ppb per week, whichever is greater.
  • Page 38 8 SPECIFICATIONS 9070 Weight of Transmitter Unit 24¼ lb. (11 kg.) Electrical Conn. via access glands as required Power Supply 100-120/200-240Vac, Requirements 50/60 Hz, 100VA. Power Supply Voltage +10%/-20%; Tolerances Frequency min. 47Hz, max.65Hz. Case Protection Transmitter Unit IP55. Maximum Distance between Sensor &...

  • Page 39: Operator's Notes

    9 OPERATOR’S NOTES 9070 9 OPERATOR’S NOTES...

  • Page 40: Our Commitment To Our Customers

    Waltron’s technical expertise and extensive experience has enabled us to provide personalized solutions to the water quality industry. It is Waltron’s commitment to provide you with timely and accurate technical service and support. We know that you will be satisfied with the quality, performance and cost of ownership of our product. If you are not, please contact me directly in Whitehouse, NJ at (800) 242-7353.

  • Page 41: Observing Safety

    To obtain safety advice concerning the use of the analyzer and reagents in this manual or any relevant Material Safety Data Sheets (MSDS) please contact Waltron L.L.C. Please note that Waltron L.L.C. mailing and UPS shipping addresses differ. DIRECT ALL CORRESPONDENCE TO: Waltron L.L.C.

  • Page 42: Warranty Agreement

    If you experience any defects in materials or find fault in manufacture of the goods that you have received within one year from the date of shipment, Waltron L.L.C. will repair, or at its option, replace the defective part free of charge. This is providing that the part is returned to Waltron L.L.C. in Whitehouse, NJ.
  • Page 43 12 WARRANTY AGREEMENT 9070 Waltron L.L.C. does not assume responsibility for contingent liability through alleged failure or failures of any of its products or their accessories. International All international orders will have a warranty period of one year after installation or 18 months after...

  • Page 44: Check List Of Materials

    Waltron L.L.C. concern does not stop when your instrument leaves our loading dock. We want to thank you for your confidence in Waltron L.L.C., our product and the service that we provide. We want to make sure that your experience with us will be one of total satisfaction starting with the condition in which you have received your product.

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