Alpha DO 500 Transmitter Dissolved Oxygen
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Preface This manual serves to explain the use of the Alpha DO 500 transmitter. It functions in two ways, firstly as a step by step guide to help you to operate the transmitter. Secondly, it serves as a handy reference guide. It is written to cover as many anticipated applications of the transmitter as possible. If there are doubts in the use of the transmitter, please do not hesitate to contact the nearest Authorized Distributor.
Table of Contents 1. Introduction ...........................................................................................................1 1.1 1.2 1.3 1.4 Before You Begin ................................................................................................................... 1 Intended Use .......................................................................................................................... 1 Safety Instructions............................................................
8. Troubleshooting ..................................................................................................37 9. General Information ............................................................................................38 9.1 9.2 9.3 9.4 Warranty............................................................................................................................... 38 Return of Goods ......................................................................................................
Instruction Manual Alpha DO 500 1. Introduction 1.1 Before You Begin We thank you for purchasing the Alpha DO 500 Transmitter. The construction of the Alpha DO 500 Transmitter employs leading edge technology and complies with safety regulations currently in force. Notwithstanding this, improper use could lead to hazards for the user or a third-party, and/or adverse effects on the plant or other equipment.
Instruction Manual Alpha DO 500 1.3 Safety Instructions - The Alpha DO 500 Transmitter should be installed and operated only by personnel familiar with the instrument and who are qualified for such work. - A defective Transmitter must neither be installed nor put into service. - The Alpha DO 500 Transmitter must only be operated under the specified operating conditions (see section 5.9). - The Alpha DO 500 Transmitter must not be repaired by the customer.
Instruction Manual Alpha DO 500 2. Getting Started 2.1 Description of Instrument The Thermo Scientific Alpha DO 500 Transmitter is used for measuring dissolved oxygen and temperature values. The dissolved oxygen values can be measured using industrial dissolved oxygen sensors. The temperature values can be measured using 2-wire or 3-wire Pt100 sensors.
Instruction Manual Alpha DO 500 2.
Instruction Manual Alpha DO 500 2.3 Connecting Peripherals 2.3.1 Connection Terminals Remove Back Cover: Remove the screws from the four corners at the back of the DO Transmitter. Remove the back cover. The connectors are exposed on the back PCBA as shown in the Figure 1 below.
Instruction Manual Alpha DO 500 2.3.2 Connecting Dissolved Oxygen Electrode Refer the instruction sheet that comes with your Dissolve Oxygen electrode to identify polarity (+ve and –ve) of DO wires. 1. Connect DO +ve wire to Pin 1 of SL1 connector 2. Connect DO -ve wire to Pin 2 of SL1 connector 2.3.3 Connecting Temperature Probe For Automatic Temperature Compensated (ATC) readings, a 100: Pt RTD temperature probe (2-wire or 3-wire) can be connected to the Transmitter. 3-Wire Probe: 1.
Instruction Manual Alpha DO 500 2.4 Installation 2.4.1 Mechanical Dimensions Alpha DO 500 ESC CAL ENT 2-wire Dissolved Oxygen Transmitter 2.4.
Instruction Manual Alpha DO 500 2.4.3 Panel Mount 1 Prepare panel cut-out of 92.0 mm X 92.
Instruction Manual Alpha DO 500 2.5 Display & Keypad 2.5.1 Display Overview The Liquid Crystal Display (LCD) of the Alpha DO 500 Transmitter has two alpha-numerical displays (Upper and a Lower). x Upper display: Measured dissolved oxygen reading (in % saturation or ppm or mg/l) is displayed when the Transmitter is in normal operation (measurement) mode. x Lower display: Measured temperature value is displayed when the Transmitter is in normal operation (measurement) mode.
Instruction Manual Alpha DO 500 Units of Measurement Indicators % Dissolved Oxygen in Percentage Saturation ppm Dissolved Oxygen in Parts Per Million mg/l Dissolved Oxygen in milligram per liter ºC Temperature in Celsius (Refer Section5.4) 2.5.2 Key Functions lpha DO500 ESC CAL ENT 2-wire Dissolved Oxygen Transmitter Key CAL Description Enter Calibration mode Enter Setup mode. ENT Access sub screens (parameters) within a group of settings in Setup mode.
Instruction Manual Alpha DO 500 3. Normal Operation 3.1 Measurement mode When the DO Transmitter is powered on, the display shows all the LCD segments briefly, and then automatically enters into the Measurement mode. MEAS READY 99.0 25.0 % °C ATC The mode indicator ‘MEAS’ at the top of the display indicates that the Transmitter is in Measurement mode. The upper alpha-numerical display shows the measured dissolved oxygen value, while the lower display shows the temperature value.
Instruction Manual Alpha DO 500 3.
Instruction Manual Alpha DO 500 4. Calibration Mode 4.1 Entering Calibration Mode While in measurement mode, press CAL key to access calibration mode. LCD indicates ‘CAL dO’. MEAS CAL % READY CAL ENT HOLD °C ATC To quit Calibration Mode Calibration Mode Calibration in mg/l or ppm - See Section 4.3 Calibration in % saturation - See Section 4.4 & NOTES: x To exit calibration mode at any time during calibration, press and keys simultaneously (escape).
Instruction Manual Alpha DO 500 4.2 Calibration in mg/l or ppm of Oxygen The DO Transmitter is capable of calibration of up to 2 points for dissolved oxygen. All new calibration values will automatically override existing calibration data. Make sure the unit of measurement is set to mg/l or ppm. (Refer Section 5.2 for switching unit of measurements). If you wish to abort the DO calibration, press and keys simultaneously and the DO Transmitter reverts to measurement mode. 4.2.
Instruction Manual Alpha DO 500 NOTES: x If the displayed value is more than r10% of the high-point value, the Transmitter indicates a calibration error by showing ‘ERR’ and blinking electrode annunciator. If this happens, press and keys together to return to measurement mode. Restart the calibration from Step1. x x To exit from calibration mode without confirming calibration, press and keys together.
Instruction Manual Alpha DO 500 NOTE: The transmitter proceeds to the second point of calibration if the displayed reading is less than 10% of the high-point value. NOTE: The transmitter does not accept the calibration and shows calibration error if the displayed (measured) value is more than 10% of the high-point value. If the low-point calibration is successful, the Transmitter proceeds to the second point. The lower display shows ‘HI’.
Instruction Manual Alpha DO 500 4.3 Calibration in% Saturation of Oxygen The DO Transmitter is capable of calibrating up to 2 points for dissolved oxygen. All new calibration values will automatically override existing calibration data. Make sure the unit of measurement is set to %. (Refer Section 5.2 for switching unit of measurements). If you wish to abort the operation during DO calibration, press and keys simultaneously and the DO Transmitter reverts to measurement mode. 4.3.
Instruction Manual Alpha DO 500 NOTES: x If the displayed value is not within 50% to 150%, the Transmitter indicates a calibration error by showing ‘ERR’ and blinking electrode annunciator. If this happens, press and keys together to return to measurement mode. Restart the calibration from Step1. x x To exit from calibration mode without confirming calibration, press and keys together.
Instruction Manual Alpha DO 500 Press ENT key to confirm the reading. NOTES: x The transmitter proceeds to the second point of calibration if the displayed reading is less than 10% x The transmitter does not accept the calibration and shows calibration error if the displayed (measured) value is more than 10% If the 0% calibration is successful, the Transmitter proceeds to the second point. The lower display shows ‘100.0’.
Instruction Manual Alpha DO 500 5. Setup Mode 5.1 Enter Setup mode The setup mode allows you to customize the settings of the DO Transmitter to suite your requirements. While in measurement mode, press the ENT key to access setup mode. LCD shows ‘SETUP’ mode indicator and the first page of setup (OFS – offset settings). Press or key to access other pages of the setup mode. To exit from setup mode any time press and keys simultaneously (escape). The Transmitter returns to measurement mode.
Instruction Manual Alpha DO 500 5.2 Configuration Settings Configuration settings let you configure the DO Transmitter to different units of measurements (%, mg/l or ppm) set salinity and pressure values.
Instruction Manual Alpha DO 500 display shows the unit measurement selected in the step 4. Press or key to set the required pressure value. Press ENT key to confirm the value. The Transmitter reverts to COF screen. Press or key to access other setup screens or press and key simultaneously (escape) to return to measurement mode.
Instruction Manual Alpha DO 500 5.3 Offset Settings In applications where continuous DO measurement is required, it may not be convenient to remove the electrode for calibration. In such cases, an on-line offset adjustment is recommended. The DO Transmitter allows you set an offset of up to ± 2.00ppm or ± 2.00 mg/l or ± 10.0% to compensate for errors in the electrode. The DO Transmitter adds or subtracts the offset value from the measured DO value and displays the corrected value.
Instruction Manual Alpha DO 500 If ‘nO’ was selected: The existing offset value (if any) is unaffected and the Transmitter reverts to OFS screen. Press or key to access other setup screens or press and key simultaneously (escape) to return to measurement mode.
Instruction Manual Alpha DO 500 5.4 Temperature Settings Temperature settings allow you to enable or disable Automatic Temperature Compensation (ATC) of the Transmitter. Set the Transmitter to manual temperature compensation (disable ATC) when the temperature of sample or process liquid is constant and a temperature probe is not available. When you disable ATC, the Transmitter allows you to set your process temperature (PºC) and calibration temperature (CºC).
Instruction Manual 4 Alpha DO 500 As the lower display value changes, the Transmitter adjusts the upper display reading automatically to suit the new offset value. Up to ± 10 ºCF offset is allowed. Press ENT key to confirm the value. The Transmitter reverts to SET ºC screen. If ATC disabled (AtC OFF): 5 Setting process temperature: The lower display shows ‘PºC’ and the upper display shows the last configured process temperature.
Instruction Manual Alpha DO 500 5.5 Range Settings The range settings allow you to map the Transmitter output current range (4-20 mA) to dissolve oxygen reading range (Zoom window). You can define the lowest DO reading of the Transmitter to 4mA (LO) and the highest DO reading to 20mA (HI). The current output can then be connected to a chart recorder to plot the DO variations. Zoom Window Default Default Lower Limit (LO) Upper Limit (HI) 0.00 199.9 0.00 19.9 0.00 19.
Instruction Manual Alpha DO 500 5.6 Hold Settings When you switch the Transmitter to calibration mode or setup mode, the transmitter goes to the ‘HOLD’ status (indicating ‘HOLD’ in the display) and freezes the current output at a specific value. Hold setting allows you to define the output current of the Transmitter when the Transmitter is in ‘HOLD’ status. 1 2 SETUP SETUP ENT ENT HOLD HOLD 2 SETUP ENT HOLD 1 From measurement mode press ENT key to enter setup mode as described in section 5.1.
Instruction Manual Alpha DO 500 5.7 Out of Range Settings When the Transmitter measures a dissolved oxygen value which does not fall within the DO range (Zoom window) defined in the ‘Range Settings’, the reading is said to be ‘out of range’. Out of range setting allows you to define the output current of the Transmitter when the Transmitter measures an ‘out of range’ DO reading.
Instruction Manual Alpha DO 500 5.8 Viewing Calibration Point Calibration setting lets you view the high-point at which the calibration has been performed in the Transmitter. 1 2 SETUP SETUP ENT 1 % ENT HOLD HOLD From measurement mode press ENT key to enter setup mode as described in section 5.1. The LCD shows the first screen of setup mode (COF). Press or key to select viewing calibration settings screen (CAL). Press ENT key to view calibration settings (CAL). 2 appears in the LCD.
Instruction Manual Alpha DO 500 5.9 Viewing Electrode Condition The electrode condition (correction factor=K) is an indication of its current working condition with respect to its original condition. The correction factor is calculated and stored in the Transmitter each time calibration is done.
Instruction Manual Alpha DO 500 5.10 Resetting Resetting restores the Transmitter to its factory default settings. It resets the calibration to factory defaults without resetting other parameters of the Transmitter. 1 2 SETUP SETUP ENT ENT HOLD HOLD 2 SETUP ENT HOLD 1 From measurement mode press ENT key to enter setup mode as described in section 5.1. The LCD shows the first screen of setup mode (COF). Press or key to select resetting screen (rSt). Press ENT key to access resetting (rSt).
Instruction Manual Alpha DO 500 6.
Instruction Manual Alpha DO 500 Other Power Input Dimensions (W x H x D) Weight (Estimated) Ambient Temp.
Instruction Manual Alpha DO 500 7. List of Accessories 7.1 Thermo Scientific Transmitter Replacement and Accessories Item Description Alpha DO 500 Transmitter General Purpose Epoxy-body Dissolved Oxygen Electrode with PT100, range: 0.50 - 20 ppm, 5m cable length, tinned open-ended Special Purpose Epoxy-body Low Dissolved Oxygen Electrode with PT100, range: 0.03 -20 ppm, 5m cable length, tinned open-ended.
Instruction Manual Alpha DO 500 7.2 Eutech Instruments Controller Replacement and Controller Accessories Item Description Alpha DO 500 Transmitter General purpose epoxy-body dissolved oxygen electrode with Pt100 temperature sensor, 0-20 ppm, 10 foot cable length, tinned open-ended.
Instruction Manual Alpha DO 500 8.
Instruction Manual Alpha DO 500 9. General Information 9.1 Warranty This transmitter is supplied with a one-year warranty against significant deviations in material and workmanship from date of purchase and a six-month warranty for probe. Each instrument will have a warranty card with a specific serial number. The warranty card must be endorsed by the Authorized Distributor at the point of sale.
Instruction Manual Alpha DO 500 10. Appendices 10.1 Appendix 1 – Salinity vs. Temperature (@ 760mmHg) The following table shows the Dissolved Oxygen values at different salinity values, at different temperatures, at barometric pressure of 760 mmHg. For other pressure levels, the Transmitter automatically corrects the value based on the pressure value input.
Instruction Manual Alpha DO 500 10.
Water Analysis Instruments North America 166 Cummings Center Beverly, MA 01915 USA Toll Free: 1-800-225-1480 Tel: 1-978-232-6000 Dom. Fax: 1-978-232-6015 Int’l Fax: 978-232-6031 Europe P.O. Box 254, 3860 AG Nijkerk Wallerstraat 125K, 3862 CN Nijkerk, Netherlands Tel: (31) 033-2463887 Fax: (31) 033-2460832 Asia Pacific Blk 55, Ayer Rajah Crescent #04-16/24, Singapore 139949 Tel: 65-6778-6876 Fax: 65-6773-0836 www.thermo.com/process © 2009 Thermo Fisher Scientific Inc. All rights reserved.
