User manual EUTECH INSTRUMENTS ALPHA PH 500 PHORP 2-WIRE TRANSMITTER (REVISION 2)

[. . . ] 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. 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. [. . . ] 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 HOLD 1. Press ENT key. Upper display shows amount of offset, in terms of pH; lower display shows current measured pH value. Allow time for temperature probe to acclimatize with surrounding bath temperature. If temperature readings are inaccurate, calibrate temperature probe as described in steps 4 and 5. Press and keys together, to return to MEAS mode. If temperature readings are correct, press ENT key and go to step 6. NOTE: If you are using a temperature probe, the probe must be submersed in the liquid you are measuring. 6. 3. 2 1. Manual Temperature Compensation Make sure the transmitter is on. Press ENT key and use or keys to o select `SET C'. - 14 - Instruction Manual pH 500 2. Primary display shows `ATC' and secondary display shows `On' or `OFF'. 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. Use or keys to set the transmitter to the temperature of your process or sample. Primary display shows temperature (default is 25. 0), and secondary display shows `C °C'. This is the set up page to input to your transmitter the temperature of your calibration solutions. Use or keys to set the transmitter to the temperature of your calibration solutions. 7. The transmitter will now compensate pH readings for the manually set temperature (values taken from P °C'). - 15 - Instruction Manual pH 500 SETUP HOLD SETUP HOLD SETUP HOLD SETUP HOLD SETUP . . HOLD °C ATC . SETUP HOLD . Temperature Compensation Setting Chart ­ alpha pH 500 Transmitter - 16 - Instruction Manual pH 500 6. 4 HOLD Current Setting SETUP HOLD When Transmitter is in CAL or SETUP modes, it automatically goes into a `HOLD' mode. To indicate Transmitter is in `HOLD' mode, output current can be set to 22 mA output by activating the `HLD On'. Press ENT key and use or keys to scroll till LCD displays `SEt' in the upper display; and `HLd' in the lower display. and keys together, to return to MEAS SETUP HOLD 2. SETUP HOLD 3. NOTE: If `HLd' is set to `OFF', then current output will be equivalent to last measured value. 6. 5 SETUP HOLD Out-of-Range Current Setting If pH or ORP readings exceed the scale, LCD displays `Or' (overrange), or `Ur' (under-range). Transmitter current output can be set to 3. 8 mA to indicate Out-of Range situation. Press ENT key and use or keys to scroll till LCD displays `SEt' in the upper display; and `org' in the lower display. [. . . ] Replace with new electrode ­ call your distributor for information. - 21 - Instruction Manual pH 500 8 TROUBLE SHOOTING GUIDE Cause a). See "Probe Care & Maintenance", Section 7. Problem Power on but no display Unstable readings Slow response a). Dirty / Oily probe. - 22 - Instruction Manual pH 500 9 SPECIFICATIONS DESCRIPTIONS 0. 00 to 14. 00 pH 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 Auto (Pt 100) / Manual (from 0 to 100 °C) 2 USA: 4. 01, 7. 00, 10. 01; NIST: 4. 01, 6. 86, 9. 18 Asymmetrical / Symmetrical 4. 0 to 20. 0 mA 3. 8 mA 4 mA (under-range) & 20 mA (over-range) 22 mA Last measured current value Custom Dual LCD 12 to 24 VDC Max. 600 96 x 96 x 66 mm / 210 g SPECIFICATIONS pH Range Temperature Range Resolution / Accuracy Millivolt Range Resolution / Accuracy Temperature Compensation Number of calibration points Number of calibration buffers Inputs Output Over- / Under range current output `ON' Select `OFF' Select HOLD current output `ON' Select `OFF' Select Display Power Requirements Load Resistance Dimension / Weight - 23 - Instruction Manual pH 500 10 TECHNICAL DIMENSIONS - 24 - Instruction Manual pH 500 11 ACCESSORIES EUTECH INSTRUMENTS Replacement Transmitter and Transmitter accessories Ordering Code No. [. . . ]