Alpha pH 500 2-Wire Transmitter pH / ORP
AQUAfast, Cahn, ionplus, KNIpHE, No Cal, ORION, perpHect, PerpHecT, PerpHecTion, pHISA, pHuture, Pure Water, Sage, Sensing the Future, SensorLink, ROSS, ROSS Ultra, Sure-Flow, Titrator PLUS and TURBO2 are registered trademarks of Thermo Fisher.
Preface This manual serves to explain the use of the Alpha 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 Power Supply Requirements (SL2 Position) 3 Connecting the Electrode & Temperature Probe (SL1 Position) 3 3 INSTALLATION 3.1 3.2 Wall Mount Panel Mount 4 DISPLAY AND KEYPAD FUNCTIONS 4.1 4.2 Display Keypad 5 CALIBRATION 5.1 5.2 5.3 5.4 Preparing the Transmitter for Calibration pH Calibration Relative mV Calibration Temperature Calibration 6 ADVANCED SETUP FUNCTIONS 6.1 6.2 6.3 6.4 6.5 6.
1 INTRODUCTION Thank you for selecting an Alpha 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. Please read this manual thoroughly before operating your transmitter.
2 PREPAR ATION 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.
2.1 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 2.2 Connecting the Electrode and Temperature Probe (SL1 Position) 2.2.
2.2.2 To connect temperature probe: For Automatic Temperature Compensated (ATC) pH readings, a 100 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.
3 3.
3.2 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.
4 4.1 DISPL AY AND KEYPAD F UNCTIONS 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. 1. SETup mode indicator 6. Primary display 11. ERRor indicator 2. MEASurement mode indicator 7. Temperature indicator 12. Probe indicator 3.
4.2 Keypad The four-button keypad allows easy and quick operations of the Transmitter. Key Function CAL 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.
5 C ALIBR AT ION 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. Be sure to remove the protective electrode storage bottle or rubber cap of the electrode before calibration or measurement.
5.2 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. CAL 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.
5.3 Relative mV Calibration 1. 2. 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. Press ▲ or ▼ keys to enter the relative mV value that matches your desired reading (only the readings in the primary display changes). 4. Press ENTER key to confirm. Transmitter will now display the offset in the readings. 5. 5.4 From the ORP MEAS mode, press CAL key.
6 ADVANCED SETUP FUNCT IONS 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. Press ENT key.
6.2 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. 2.
6.3 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.
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. Use ▲ or ▼ keys to set the transmitter to the temperature of your process or sample. Press ENT key. 5.
SETUP HOLD SETUP SETUP HOLD HOLD SETUP SETUP HOLD HOLD °C ATC SETUP HOLD Temperature Compensation Setting Chart – alpha pH 500 Transmitter 16
6.4 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‟.
6.6 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‟.
3. LCD displays „ASY‟ (asymmetrical operation). Use ▲ or ▼ keys to select for „SYS‟ (symmetrical mode of operation). Press ENT key again. 4. Press and keys together, to return to MEAS mode.
7 PROBE C ARE AND M AINT EN ANCE 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.
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. pH electrode activation (for glass body electrodes only) WARNING: Only qualified persons proficient with the safe handling of dangerous chemicals should perform the procedure below.
8 TROUBLE SHOOTING GU I DE 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). Re-wire loop cables with correct polarity.
9 SPECIFIC ATIO NS SPECIFICATIONS DESCRIPTIONS pH Range 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, 9.18 Inputs Asymmetrical / Symmetrical Output 4.0 to 20.
10 TECHNIC AL DIM ENSIONS 24
11 ACCESSORIES THERMO SCIENTIFIC Replacement Transmitter and Transmitter accessories Ordering Code No.
EUTECH 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 10.01 calibration buffer, 1 pint 35653-01 pH 4.
12 WARR ANTY 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.
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.
