Related Manuals for Hach 8450
Summary of Contents for Hach 8450
- Page 1 Catalog Number 16116 8450 Residual Free Chlorine Monitor INSTRUMENT MANUAL © Hach Company, 2003. All rights reserved. Printed in the U.S.A. ap/dk 07/03 2ed...
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Page 3: Table Of Contents
Specifications ................................7 Section 1 Introduction ............................9 1.1 Introducing the Sigma Residual Chlorine Monitor Model 8450 ................9 1.2 Overview of Chlorine Characteristics ........................9 1.2.1 Free Chlorine ............................. 9 1.2.2 Probe Response and Effects of pH ......................9 Section 2 Installation ............................ - Page 4 Table of Contents 3.7 Initial Power-Up and Self Test ........................... 31 3.7.1 *Check* Messages ..........................31 3.7.2 Inhibiting Messages..........................31 3.8 LCD Menu Descriptions ............................ 32 3.9 Setting Main Screen Time, Date, Temperature, and Concentration Units............33 3.10 Setting Maximum Range..........................33 3.11 System Calibration ............................
- Page 5 Table of Contents 4.2 Probe Maintenance and Poor Probe Output ..................... 51 4.2.1 Membrane Troubleshooting and Maintenance..................51 4.2.2 Quick Membrane Replacement Procedure....................51 4.2.3 Probe Electrode Maintenance ......................... 52 4.2.4 Testing Thermistor Output ........................53 4.2.5 Testing for Electrical Isolation ........................54 4.3 Resolving Calibration Problems ........................
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Page 6: Safety Precautions
Safety Precautions Please read this entire manual before unpacking, setting up, or operating this instrument. Pay particular attention to all danger and caution statements. Failure to do so could result in serious injury to the operator or damage to the equipment. To ensure the protection provided by this equipment is not impaired, do not use or install this equipment in any manner other than that which is specified in this manual. -
Page 7: Specifications
Specifications Specifications are subject to change without notice. Repeatability ±0.5% Linearity ±0.5% Output Range 0–20 ppm (selectable) Displayed Precision 0.01, 0.1, 1 Damping Time Constant 0–300 seconds Power 110/220 V ac (switchable) Monitor Enclosure NEMA-4X (wall), NEMA-12(panel) Monitor Temperature Limits -20 to 50 °C (-4 to 122°F) Alarm LEDs 3 (red) Concentration and temperature (°F and °C) - Page 8 Visit http: //www.hach.com...
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Page 9: Section 1 Introduction
1.2.2 Probe Response and Effects of pH The pH of the water has a definite effect on the response of Model 8450 Free Chlorine probes. In general, probes will begin to exhibit a reduced response as pH levels increase above 7.5. - Page 10 Section 1 The effect of pH on the Sigma Free Chlorine probe is illustrated in Figure The Sigma Free Chlorine probe has a response that goes beyond the HOCl – species, and that it has a usable response to the hypochlorite ion (OCl ).
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Page 11: Section 2 Installation
Section 2 Installation 2.1 Overview Installation of the residual chlorine monitor consists of mounting and wiring the monitor, pipe-mounting the probe (for submersion applications), and connecting sample and drain lines for applications requiring flow cell usage. Connect the probe to the electronics module by plugging the probe multi-pin plug into the receptacle at the bottom of the electronic module. -
Page 12: Panel Mounting The 8450
Section 2 Figure 4 Wall Mounted Monitor’s Depth 2.3 Panel Mounting the 8450 2.3.1 Panel Mounting Considerations To install the panel-mount enclosure, remove the monitor’s four front panel securing screws and the front-panel. Install the panel mount installation plate (Cat. No. 16411). Note that the probe receptacle in a panel-mount application may not be easily accessible behind the panel. - Page 13 Panel Mount Attaching Parts (Side View) Enclosure Plate Panel #10-32 x 0.75 stainless slotted hex washer-head 1/4-20 x 0.25 stainless steel machine screw machine screw 1/4-20 x 0.75 stainless slotted hex wahser-head machine Z-bracket screw Page 13 Panel Mounting the 8450 16116Install.fm...
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Page 14: Rail-Mount Mounting
Section 2 2.4 Rail-Mount Mounting The Rail-Mount kit (Cat. No. 16088) allows the meter to be clamped to a hand rail (that runs horizontally) or even to a pole (vertical pipe) if so desired (Figure 7). Brackets that attach to the back of the meter are in turn attached to the rail or pole with U-bolt type pipe clamps. - Page 15 Section 2 Figure 8 Submerged Probe Using Pipe Mount Kit Probe Cable to Monitor 1” (2.54 cm) FNPT 1.5” (3.8 cm) diam. Handrail Probe Adapter Cone 1” (2.54 cm) Schedule 80 PVC pipe (Customer-supplied, Probe length as required.) Probe Pipe Bracket Page 15 Probe Mounting 16116Install.fm...
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Page 16: Electrical Connections
Section 2 Figure 9 Flow Cell and Connections (Typical) 6.0” (15.2 cm) 5.5” (14.0 cm) Mounting Plate Flow Cell 0.25” Inlet 0.5” Outlet (Inlet Flow = 8 to 25 gph) Hand Valve Pressure Regulator (10–15 PSI Output) Water Line Mounting Plate Water Line Flow Cell Pressure Regulator (10–15 psi Output) -
Page 17: Ac Power
Section 2 panel-mount system, it is best to make all connections at the time of physical installation. 2.6.1 ac Power Wall mounted chlorine monitors are shipped with the power cord already connected. If no outputs or alarms are to be used, all that is necessary is to plug the probe cable into the receptacle at the bottom of the enclosure and plug the power cord into a standard wall receptacle. -
Page 18: Ma Surge Protector
Section 2 those cases where this extended cable is to be routed through a conduit. Figure 11 Table 1 depict the cable connections. Figure 11 Probe Connection Options Direct Connection Connection Using Screw-Teminal Junction Box Removable Face Plate Probe Connector Junction Box Connector Junction Box Cable... -
Page 19: Connections And Setup
Section 2 • Small straight-slot screw driver • Milliampmeter • Color-coded connection wire, 10 in. (25.4 cm)/test leads • 4-20 mA Surge Protector(s) (Cat. No. 16326) 2.7.1 Connections and Setup Warning: Remove ac power to the instrument before proceeding. 1. Remove electrical power to the meter. 2. -
Page 20: Test And Check Procedure
Section 2 2.7.2 Test and Check Procedure Activate Result From the Main screen brings up the Main menu. ↑ Several times to move to >VMA. Selection menu: CH1, CH2, ADJ. ↑ Several times to move to >ADJ. Channel selection screen: >---NONE---. Enter channel selection. -
Page 21: Data Communications
Figure 15 4-20 mA Device Adjustment Setup 2.8 Data Communications Data communication configurations for the 8450 monitor include: 1) No Communications option, 2) RS232 with data logging option, and 3) RS485 with data logging option. The default communications data format is 9600 baud, 8-bit word, 1 stop bit, and no parity. - Page 22 Section 2 Figure 16 Serial Cable Connections BLK 1 RED 2 WHT 3 GRN 4 Female DIN Plug attached to monitor’s case RS232 Personal Computer Cable (Cat. Number 16086) Table 2 Serial Communication Conductors Signal Name Color Mini-Din DB9M TB6-1 Busy Black TB6-2...
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Page 23: Rs485 Communications
Section 2 2.9 RS485 Communications Monitors with the RS485 and data logging option can communicate via this digital network standard. RS485 signals and typical connection strategy is indicated in Table Table 4, and Figure 18 below. Operation under the RS485 standard requires that the following conditions are met: •... -
Page 24: Probe Preparation
Section 2 Figure 17 RS485 Network (Typical) 4000 ft. (Max.) TB6 (Instrument #N) TB6 (Instrument #N – 1) TB6 (Instrument #1) 2.10 Probe Preparation Prior to operating the system, the chlorine probe must be prepared for use. Preparation includes disassembly of the probe to install a new membrane and to fill the probe with electrolyte. -
Page 25: Probe Preparation Procedure
Section 2 Note: A “good” membrane will noticeably absorb water like a sponge and change its color from white to almost clear. This should happen in less than a minute. A “bad” membrane will remain white. 2.12 Probe Preparation Procedure Warning: Appropriate care should be exercised when performing the following procedure because the electrolyte contained within the probe is an irritant! To prevent injury, eye, hand, and body protection should be worn. - Page 26 Section 2 10. Connect the probe to the monitor and apply power. Allow about 12 hours for the displayed reading to stabilize prior to attempting to calibrate the instrument (see section 3.13.1 on page 34). Page 26 Probe Preparation Procedure 16116Install.fm...
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Page 27: Section 3 Operation
Section 3 Operation 3.1 Overview Prior to startup and operation, you should become familiar with the control switches located on the front of the monitor. The illustrations that follow identify these switches and the display features. This chapter describes the operation of the meter, its display and controls, how to set it up, calibrate it, the security feature, use of the optional data logger, and other operational issues. -
Page 28: Menus And Parameters
Section 3 3.3 Menus and Parameters System parameters are data that can be changed to affect the operation of the instrument. Where possible in the display, a parameter label has been placed above the parameter to identify it. Parameter labels can be quickly identified as having only the first character capitalized. -
Page 29: Arrow Icons
Section 3 3.4.2 Arrow Icons These icons move the menu cursor (>) when it is visible. During parameter changes (menu cursor is not visible and parameter is blinking) the keys are used to scroll through the possible parameter values. Note that on the Main Screen, the menu cursor is not usually visible. -
Page 30: Factory Default Parameters
Section 3 3.5 Factory Default Parameters Version V1.3 Date 15 Jan 96 Time 08:00 Site Sigma, MEDINA, NY Range Conc Units Precision 0.01 Temp Units °F Damping 2 seconds Alarm 1 Sp 2.00 ppm Alarm 1 Rsp 1.00 ppm Alarm 1 Delay 10 seconds Alarm 1 Lfit 0000... -
Page 31: Initial Power-Up And Self Test
Section 3 2. Place another magnet over the arrow icon to increase the contrast or over the arrow icon to decrease it. Down 3. When the display has the desired contrast, remove the magnets in reverse order. 3.7 Initial Power-Up and Self Test Series 8400 monitors feature a convenient method of viewing and changing system parameters. -
Page 32: Lcd Menu Descriptions
Section 3 3.8 LCD Menu Descriptions Table 5 Main Menu Option Descriptions* ##ppm mg/L Prec 0.01 Damp #s (seconds) Zero Calibration Sequence Set #.## Reset #.## lfit 0000 (0 sec. or 1 sec.) Set #.## Reset #.## lfit 0000 (0 sec. or 1 sec.) CHECK lfit 0000 (0 sec. -
Page 33: Setting Main Screen Time, Date, Temperature, And Concentration Units
Section 3 Table 5 Main Menu Option Descriptions* MODEL 8450 Ver. #.##, ## ppm- Free Cl (display only) Change site (site information) SITE Change site (16 locations) Rate (# min.) SETTINGS Ctrl (off / on / Rst) day mo.yr.hr:min DATA... -
Page 34: Frequency Of Calibration
Section 3 3.12 Frequency of Calibration The frequency of calibration for Series 8400 Chlorine monitors depends upon the environmental conditions of the probe. It is recommended that the unit be monitored for reading fluctuations or erroneous outputs for the first several months of operation. -
Page 35: Stabilization Issues
Section 3 3.13.2 Stabilization Issues The meter will not accept calibration unless the probe signals are stable over time and in amplitude. It is also important that the probe and calibration water are in equilibrium. Following the procedural guidelines in this section will help ensure fast and accurate calibrations. -
Page 36: Operational Considerations
Section 3 3.13.5 Operational Considerations If the instrument software is password locked, you will not be permitted into the ZERO or SPAN calibration menu. Instead, you will be prompted by the instrument to first enter the password. In order to prevent false alarms, enter into the specific instrument calibration routine before subjecting the probe to the calibration concentration. -
Page 37: Zero Calibration Procedure
Section 3 In preparation for zero calibration, fill a beaker with approximately 2" of deionized water. Place the beaker into a tub (or sink) and permit the sample stream to flow around it until the temperature of the deionized water is same as the sample stream. -
Page 38: Preparation
Section 3 3.15.1 Preparation Span calibration can be performed using a flow cell, in the flow stream, or in a beaker with a stirring bar. Although all three of these methods are acceptable, the flow cell setup is generally recognized as providing optimal conditions for chlorine monitoring and thus, span calibration. -
Page 39: Span Calibration Procedure
Chlorine probes vary in their sensitivity to residual chlorine and, as probes age, their sensitivity will naturally decrease as internal components are consumed. Upon calibration, the Model 8450 determines a relative probe sensitivity (the percentage is derived from an average known output of all... -
Page 40: Alarm Setup
Section 3 manufacturer chlorine probes under ideal conditions) and makes appropriate internal adjustments. Probe sensitivity is displayed as a percentage in the lower right corner of the display during zero and span calibration procedures. The displayed probe sensitivity may range from 50% to over 500% (nominal is 100%) and is good indicator of the probe’s overall operating condition. -
Page 41: Selecting Alarm Relay Options (Lfit)
Section 3 Figure 27 Low Set Point Example >Set Reset lfit 5.00 10.0 0000 3.17.4 Selecting Alarm Relay Options (lfit) Defining alarm operation parameters is accomplished from the “lfit” (Latching, Fail-safe, Inhibit, and Test) selection located within either the “Al 1" or “Al 2" menus. -
Page 42: Alarm Time Delays
Section 3 3.17.6 Alarm Time Delays The alarm time delay feature has been included for applications where momentary swings in chlorine may occur but do not necessarily constitute an alarm condition. A time delay from 0 to 600 seconds may be specified. (Default value =10 seconds.) 3.18 VMA Output Setup The residual chlorine monitor has two independent output channels. -
Page 43: Changing Site Location Designation
Section 3 entered, the parameter for that menu can be changed, as can any other menu parameter until the meter is resecured in the SEC menu. When the correct password has been entered, the security must be manually re-enabled (locked) in the “SEC” menu after all parameter changes are complete, otherwise the meter will not be secured. -
Page 44: Optional Data Logger
Section 3 Figure 30 Damping Curve Response (Example) FINAL VALUE = 8.3 ppm 99% Final = 8.22 ppm 98% Final = 8.15 ppm 95% Final = 7.88 ppm 86% Final = 7.16 ppm 63% Final = 5.23 ppm Time (seconds) Time Constants For other examples, a Damping value of 1 second would cause the reading to reach 63% of its maximum value in 1 second;... -
Page 45: Settings Menu - Data Log Setup
Section 3 Figure 32 LOG Menu Screen SETTINGS DATA REPORT SETTINGS menu selections allow the operator to set the rate at which the samples are taken and turn the sampling on/off or clear the memory. The DATA menu allows for on-screen viewing of the logged data. The REPORT menu allows the operator to send the logged data to other devices such as a printer or terminal device and select a long or short format for the data sent. -
Page 46: Sampling Rate
Section 3 Figure 33 Logger’s SETTINGS Menu Rate Ctrl 1 Min 3.23.2 Sampling Rate From the “GEN” menu select “LOG” then “SETTINGS.” “Rate” has a factory default value of 1 minute (its minimum value) and a maximum value of 90 minutes. -
Page 47: Reports - Printing Trend Data
Section 3 more than one day if the instrument has been turned off, or if the on-off- reset control has been set to “Off” for more than 24 hours. Use the icon after the date has been selected. 3. Select the Time. The “time,”... -
Page 48: Other Data Logger Considerations
Section 3 Figure 35 Long and Short Report Formats 3.23.6 Other Data Logger Considerations When viewing records from the data logger, there may be more than one data series on a given date. The instrument is designed to preserve every data record in its memory and avoids the possibility of losing data. -
Page 49: Adc
Max Range Parameter (in RDG menu) 3.24.2 ADC The Model 8450 measures the amplified probe signal with a 12-bit analog-to-digital converter and then reports this as the ADC value. This value can range from 0 to 4095 and is provided for troubleshooting purposes. - Page 50 Section 3 Page 50 SYS Menu 16116Operation.fm...
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Page 51: Section 4 Maintenance And Troubleshooting
4.1 Maintenance Overview This chapter provides information on normal maintenance procedures and troubleshooting. Maintenance and troubleshooting for the 8450 Residual Free-Chlorine Meter comprises three major categories: 1) Issues related to calibration, 2) Issues related to probe maintenance, and 3) Handling of error messages. -
Page 52: Probe Electrode Maintenance
Section 4 When the membrane wets (changes color), you may install either side against the platinum electrode. 2. Unscrew the membrane cap and discard the old membrane. Place the new, prewetted membrane on top of the platinum electrode where the old one was removed. -
Page 53: Testing Thermistor Output
Section 4 Figure 36 Probe Tip and Anode Platinum Tip Probe Body Silver Anode Warning: The following procedures require the use of Nitric Acid. Only personnel experienced in the handling and use of acids should perform this procedure because serious injury could result if the solution is improperly handled. -
Page 54: Testing For Electrical Isolation
Section 4 There is a significant time lag before the thermistor reaches the temperature of its surroundings. Be certain the resistance reading is stable (not rising or falling) when it is recorded. Table 7 Thermistor Resistance by Temperature Temp (°C) Temp (°F) Resistance ±... -
Page 55: Timer Expires During Zero Calibration
Section 4 4.3.1 Timer Expires During Zero Calibration 4.3.1.1 Eliminate Possible Mechanical Causes Cause Solution Probe Temperature Considerations Probe temperature not settled. on page Clean probe and repeat conditioning. Probe output signal unstable. Replace membrane if damaged or dirty. Do procedure under Testing for Electrical Probe output is high. -
Page 56: Timer Expires During Span Calibration
Section 4 4.3.2 Timer Expires During Span Calibration 4.3.2.1 Eliminate Possible Mechanical Causes Cause Solution Probe Temperature Considerations Probe temperature not settled. on page Clean probe and repeat conditioning. Probe output signal unstable. Replace membrane if damaged or dirty. Do procedure under Testing for Electrical Isolation on page Probe output is low. -
Page 57: Reading Drifts After Span Calibration
Section 4 into the flow cell or flow stream and allow 30 minutes before starting the span calibration. d. Re-zero and re-span the instrument, allowing at least 30 minutes of stabilization time. 4.4 Reading Drifts After Span Calibration This condition may be caused when the instrument is span calibrated before it has settled to its final reading. - Page 58 10.0 ppm. Select and, after 15 seconds, verify the relative probe sensitivity value (displayed in lower right corner of display) is within 150% (±20). Figure 38 Simulated Input Calibration Setup 000.00 8450 Meter (not used) Precision 0 and 600 mV isolated power Volt meter...
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Page 59: Check* Messages (Alphabetical Listing)
Section 4 4.7 *CHECK* Messages (Alphabetical Listing) Alarm 1 and Alarm 2 are automatically cleared and inhibited in the presence of certain CHECK alarms. If Alarm 1 or Alarm 2 is already active during these alarms, its state is cleared. Table 9 Message Description... -
Page 60: Resetting Factory Defaults
Section 4 4.8 Resetting Factory Defaults Refer to section 3.5 on page 30 for a list of the instrument's factory default settings. Note: During this procedure the factory default parameters will be restored. Prior to performing this procedure, document the instrument's parameter setting so that they may be re-installed later. -
Page 61: Replacement Parts And Accessories
Replacement Parts and Accessories Probe Description Qty./pkg Cat. No. Free-Chlorine Electrolyte (use with 16979 membrane)..........16 oz. bottle ....16973 Membranes, Free Chlorine .....................15/pkg....16979 O-Ring........................5 sets of 3 each....16905 Probe Test Fixture (connector with leads, resistors) ..............each....16084 Free-Chlorine Probe........................each.... - Page 62 Visit http: //www.hach.com...
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Page 63: Contact Information For U.s.a. And Outside Europe
Brief description or model number • Quantity Ordering Information for Outside the U.S.A. and Europe Hach Company maintains a worldwide network of dealers and distributors. To locate the representative nearest you, send E-mail to intl@hach.com or visit www.hach.com. Technical Support Technical and Customer Service Department personnel are eager to answer questions about our products and their use. -
Page 64: Contact Information For Europe
Contact Information for Europe For technical support, repair service, and ordering information please refer to the contact information below for your specific country. Austria Germany (Ordering) Spain Dr. Bruno Lange Ges.m.b.H. Dr. Bruno Lange GmbH & CO. KG NEURTEK. M.A-LANGE GROUP Industriestraße 12 Königsweg 10 c/ Araba, 45. -
Page 65: Warranty
In the event that a defect is discovered during the warranty period, Hach Company agrees that, at its option, it will repair or replace the defective product or refund the purchase price, excluding original shipping and handling charges.