Instruction Manual pH 500 LCD Transmitter pH/ORP Transmitter with Display 68X216829 Rev 2 05/04 Technology Made Easy ...
Preface This manual serves to explain the use of the pH 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 2 PREPARATION 2 2.1 2.2 3 3.1 3.2 4 4.1 4.2 5 5.1 5.2 5.3 5.4 6 6.1 6.2 6.3 6.4 6.5 6.
Instruction Manual 1 pH 500 INTRODUCTION Thank you for selecting a pH 500 pH/ORP Transmitter. This transmitter is a microprocessor-based instrument that is designed to be sturdy and user-friendly. It is capable of measuring pH, mV and temperature. This transmitter has many user-friendly features – all of which are completely accessible through the water-resistant membrane keypad. Your transmitter includes an instruction manual and a warranty card.
Instruction Manual 2 pH 500 PREPARATION Remove screws from the four corners at the back of the Transmitter, and remove back cover. Connectors should be exposed as follows: Figure 1 – Connection Guide All wiring is done on 2 detachable connectors: – 1. 9-pin connector (located on SL1 position) for pH electrode, temperature sensor and potential matching pin (PMP); & 2. 3-pin connector (located on SL2 position) for power supply. Using a suitable screwdriver, loosen screws from top of connector.
Instruction Manual 2.1 pH 500 Power Supply Requirements (SL2 Position) This transmitter requires a 12 to 24V DC power supply. Other Transmitters and/or a chart recorder may be connected in series. 1. Insert positive loop wire from power supply to pin 1, tighten screw. 2. Insert negative loop wire to pin 2, tighten screw. This wire may be linked to a chart recorder or to negative terminal of power supply. 1 Power Supply Alpha pH500 2 Chart recorder 2.
Instruction Manual 2.2.2 pH 500 To connect temperature probe: For Automatic Temperature Compensated (ATC) pH readings, a 100Ω Pt RTD temperature probes can be used. Industrial pH electrodes are often offered with ATC, which will typically be bare wires. 3-wire probe 1. Insert Pt 100 sense wire to pin 5 of connector. Tighten screw. 2. Insert Pt 100 input wire to pin 6 of connector. Tighten screw. 3. Insert Pt 100 return wire to pin 7 of connector. Tighten screw. 2-wire probe: 1.
Instruction Manual 3 3.
Instruction Manual 3.2 pH 500 Panel Mount 1. Prepare panel cut-out of 92.0 mm by 92.0 mm Panel (side) 2. Remove back cover of transmitter and slide it through panel cut-out 4. Thread rods through lugs until transmitter is held in place against panel 3.
Instruction Manual 4 4.1 pH 500 DISPLAY AND KEYPAD FUNCTIONS Display The LCD has a primary and secondary display. • The primary display shows the measured pH, mV or Relative mV value. • The secondary display shows the measured temperature. In Calibration mode, pH buffer values are displayed here; while measured mV values are displayed in the ORP Calibration mode. 15 14 1 2 SETUP MEAS CAL -.8.8.8 READY HOLD ERR 13 3 12 -1.8.8.8 11 mV pH 4 5 6 7 °C pH 8 ATC 9 10 1.
Instruction Manual 4.2 pH 500 Keypad The four-button keypad allows easy and quick operations of the Transmitter. Key CAL Function Brings you directly into the Calibration mode. If you were in pH Measurement mode, press CAL to enter pH Calibration mode. If you were in mV Measurement mode, press CAL to enter mV Calibration mode.
Instruction Manual 5 pH 500 CALIBRATION 5.1 Preparing the Transmitter for Calibration Before starting calibration, make sure you are in the correct measurement mode. When you switch on the transmitter, the transmitter starts up in the units last used. For example, if you shut the transmitter off in “mV” units, the transmitter will read “mV” units when you switch the transmitter on.
Instruction Manual 5.2 pH 500 pH Calibration A complete 2-point CAL is required for this Transmitter. If Calibration is aborted after 1st calibration point, transmitter reverts to previous Calibration data. 1. Rinse probe thoroughly with de-ionized water or a rinse solution. Blot excess liquid. 2. Dip probe into calibration buffer. End of probe must be completely immersed into buffer. Stir probe gently to create a homogeneous sample. 3. From pH MEAS mode, press CAL to enter pH calibration mode.
Instruction Manual 5.3 Relative mV Calibration 1. 2. From the ORP MEAS mode, press CAL key. CAL indicator appears at top of LCD. Primary display shows relative mV reading and secondary display shows absolute mV value. NOTE: If you have never calibrated relative mV or if the transmitter has been reset, the value shown in the primary display is the same as the absolute mV value. 3.
Instruction Manual 6 pH 500 ADVANCED SETUP FUNCTIONS The advanced setup mode lets you customize your transmitter’s preferences and defaults. This transmitter features different sub groups that organize all setup parameters. The sub-groups are: 6.1 Offset Setting (Unavailable in ORP mode) As a result of the continuous measurement and the application concerned, it may not be convenient to remove the electrode for calibration. In such cases, an on-line Offset adjustment is offered. SETUP 1.
Instruction Manual 6.2 pH 500 Output Range Setting Output of pH 500 transmitter is via the 2-wire power supply loop. Both the 4 mA and 20 mA output can be assigned to specific pH or ORP values, for a more refined output. SETUP HOLD 1. Press ENT key and use ▲ or ▼ keys to scroll till LCD displays ‘r n g ’. Press ENT again. Upper display shows pH value, ‘0.00 pH’ (or – 1000 mV) while lower display shows ‘r 4.0’. This is the set up page for the pH or ORP output range setting for the 4mA output current.
Instruction Manual 6.3 pH 500 Temperature Compensation Setting (Unavailable in ORP mode) pH values other than pH 7.00 are affected by temperature. Under varying temperature conditions, use ATC to compensate pH values. If temperature of bath is constant, and a temperature probe is not available, Manual Temperature Compensation can be utilized. 6.3.1 Automatic Temperature Compensation For automatic temperature compensation (ATC), connect ATC probe to transmitter, as described in Section 2.2.2. 1.
Instruction Manual pH 500 2. Press ENT key. Primary display shows ‘ATC’ and secondary display shows ‘On’ or ‘OFF’. Use ▲ or ▼ keys to select ‘ATC Off’. Press ENT. 3. Primary display shows temperature (default is 25.0), and secondary display shows ‘P °C’’. This is the set up page for setting the temperature of your transmitter to the temperature of your process or sample by using an accurate thermometer as reference. 4.
Instruction Manual pH 500 SETUP HOLD SETUP SETUP HOLD HOLD SETUP SETUP HOLD . . HOLD °C . ATC SETUP HOLD .
Instruction Manual 6.4 pH 500 HOLD Current Setting When Transmitter is in CAL or SETUP modes, it automatically goes into a ‘HOLD’ mode. SETUP HOLD To indicate Transmitter is in ‘HOLD’ mode, output current can be set to 22 mA output by activating the ‘HLD On’. 1. 2. 3. Press ENT key and use ▲ or ▼ keys to scroll till LCD displays ‘SEt’ in the upper display; and ‘HLd’ in the lower display. Press ENT again. Upper display now shows ‘HLd’. Lower display will show either ‘OFF’ or ‘On’.
Instruction Manual 6.6 pH 500 Configuration 6.6.1 Selecting pH or ORP Mode of Operation The alpha pH 500 transmitter is not only a pH transmitter, but also an ORP transmitter. When configured to measure ORP, electrode must be changed and calibrated (see Section 5.3 for calibration procedure). ORP values are measured and displayed in mV only. SETUP HOLD SETUP 1. Press ENT key and use ▲ or ▼ keys to scroll till LCD displays ‘COF’ (Configuration). Press ENT again. 2. LCD displays ‘PH’.
Instruction Manual pH 500 3. LCD displays ‘ASY’ (asymmetrical operation). Use ▲ or ▼ keys to select for ‘SYS’ (symmetrical mode of operation). Press ENT key again. 4. Press S and T keys together, to return to MEAS mode.
Instruction Manual 7 pH 500 PROBE CARE AND MAINTENANCE Since your pH electrode is susceptible to dirt and contamination, clean it every one to three months depending on the extent and condition of use. NOTE: For specialty electrode care, consult the instruction manual included with your electrode. pH electrode storage For best results, always keep the pH bulb wet. Use the protective electrode storage bottle or rubber cap filled with electrode storage solution to store your electrode.
Instruction Manual pH 500 Reactivating the pH electrode If stored and cleaned properly, your pH electrode should be ready for immediate use. However, a dehydrated bulb may cause sluggish response. To rehydrate the bulb, immerse electrode in a pH 4 buffer solution for 10 to 30 minutes. If this fails, the electrode requires activation.
Instruction Manual 8 pH 500 TROUBLE SHOOTING GUIDE Problem Cause Solution Power on but no display a). Loose connections a). Check cables are making good contact. Unstable readings b). Cables not in correct polarity (+ and – position). a). Air bubbles in probe. a). Tap probe to remove bubbles. b). Dirty probe. b). Clean the probe and recalibrate. c). Probe not deep enough in sample. d). External noise pickup or induction caused by nearby electric motor. Slow response b).
Instruction Manual 9 pH 500 SPECIFICATIONS SPECIFICATIONS pH Range DESCRIPTIONS 0.00 to 14.00 pH Resolution / Accuracy Temperature Range Resolution / Accuracy Millivolt Range Resolution / Accuracy 0.01 pH / ± 0.01 pH -10.0 to 110.0 °C 0.1 °C / ± 0.5 for °C -1000 to +1000 mV 1 mV / ± 2 mV Temperature Compensation Auto (Pt 100) / Manual (from 0 to 100 °C) Number of calibration points 2 Number of calibration buffers USA: 4.01, 7.00, 10.01; NIST: 4.01, 6.86, 9.
Instruction Manual pH 500 10 TECHNICAL DIMENSIONS - 24 -
Instruction Manual pH 500 11 ACCESSORIES EUTECH INSTRUMENTS Replacement Transmitter and Transmitter accessories Ordering Code No.
Instruction Manual pH 500 OAKTON INSTRUMENTS Replacement Transmitter and Transmitter accessories Ordering Code No. Item 56717-20 pH 500 pH/ORP 2-wire LCD Transmitter with display 35807-20 pH/Temp electrode with PMP and 10-ft cable 35801-21 Platinum ORP electrode with 10-ft cable 05994-90 BNC to spade lug adapter Calibration Solutions Ordering Code No. Item 00654-00 pH 4.01 calibration buffer, 1 pint 00654-04 pH 7.01 calibration buffer, 1 pint 00654-08 pH 10.
Instruction Manual pH 500 12 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.
For more information on our products, contact your nearest distributor or visit our website listed below: Oakton Instruments Eutech Instruments Pte Ltd. P.O Box 5136, Blk 55, Ayer Rajah Crescent, Vernon Hills, IL 60061, USA #04-16/24 Singapore 139949 Tel: (1) 888-462-5866 Tel: (65) 6778 6876 Fax: (1) 847-247-2984 Fax: (65) 6773 0836 E-mail: info@4oakton.com E-mail: marketing@eutechinst.com Web-sites: www.4oakton.com www.oaktoninstruments.com Web-site: www.eutechinst.
