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Input Calibration
January 2009 UDA2182 Universal Dual Analyzer Product Manual 151
8.6 ORP Calibration
8.6.1 Introduction
ORP calibration consists of adjusting the reading of the analyzer to match a known value.
There are two types of ORP calibration supported:
• To calibrate the system to compensate for changes in electrode potentials over time,
the ORP electrode is placed in a reference solution of known ORP value, and the
analyzer reading is adjusted to match this value, as described in Section 8.6.
Instructions for preparing standard solutions are also provided below. These solutions
are stable for only short periods of time (less than 8 hours) and are only
approximations of ORP potentials.
• To calibrate the UDA2182 only, not the whole system including electrodes, apply a
known millivolt signal to the Analyzer instead of input from the electrode, then adjust
the UDA2182 reading to match the actual millivolt input, as described in Table 8-7.
8.6.2 ORP Calibration Using Reference Solution
Recommended to adjust for changes in electrode potential over time
An ORP measuring system can be checked by measuring a solution having a known
oxidation-reduction potential, then adjusting the UDA2182 to match. Although a
reference solution provides only an approximation of ORP potential, the system can be
adjusted periodically to compensate for changes in electrode potential over time.
Materials
The materials required to use the ORP standardization method are:
• A solution with a known oxidation-reduction potential. (See “Instructions for
preparing solution” below.
• A container for the solution, large enough to immerse the electrode to measuring
depth.
• Distilled or de-ionized water to rinse the electrode.
Instructions for preparing solution
To prepare an ORP standardization solution, dissolve 0.1 g of quinhydrone powder in
5 cc of acetone or methyl alcohol (methanol). Add this to not more than 500 cc of a
standard pH reference solution (buffer), about 1 part saturated quinhydrone to 100 parts
buffer solution. The oxidation potential of this solution is listed below for several
temperatures. The polarity sign shown is that of the measuring element with respect to the
reference element.
These solutions are unstable and should be used within eight hours of preparation.
All mV values in Table 8-5 have a
± 30 mV tolerance.
- 70-82-25-119 1
- January 2009 1
- Notices and Trademarks 2
- About This Document 3
- Symbol Definitions 4
- Contents 5
- Figures 11
- 1 Introduction 13
- Introduction 14
- 1.2 Features 15
- 2 Specifications 17
- Specifications 18
- 2.2 CE Conformity (Europe) 19
- 3.1 Overview 21
- 3.2 Unpacking and Preparing 22
- 3.3 Mounting 22
- Panel Mounting Dimensions 23
- Panel Mounting Procedure 23
- Unpacking 24
- Unpacking 25
- Wall Mounting Dimensions 26
- 4 Power Wiring 27
- Power Wiring 28
- 4.4 Installing Power Wiring 29
- Figure 4-1 Power Wiring 31
- 5 Operating the Analyzer 32
- 5.2 Analyzer Overview 33
- 5.3 Key Navigation 34
- 5.4 Displays Overview 35
- Online Functions 36
- 5.5 Input Displays 37
- 5.6 PID Displays 38
- PID LOOP 1 39
- AUTO CYCLE 1 40
- Operating the Analyzer 41
- Operating the Analyzer 42
- 5.8 Pharma Display 45
- Stage 1Pharma Test 47
- 80.00PCT Warn 47
- 5.9 Cation Calc Display 49
- CATION CALC 51
- 5.10 Status Display 53
- between the 57
- 5.11 Event History 58
- 5.13 Modbus Communications 62
- 6 Configuration 63
- 6.2 UDA2182 Block Diagram 64
- 6.3 Main Setup Menu 65
- 6.6 Inputs Configuration 75
- Wire Size Sq mm 83
- 6.7 Outputs Configuration 86
- 6.8 Relays Configuration 88
- to display the 89
- Any Analog Signal 90
- See Table 6-3 90
- 6.9 Alarms Configuration 93
- 6.10 Monitors Configuration 95
- 6.11 Math Configuration 97
- (Linear Only) 98
- 6.12 Logic Configuration 99
- Configuration 101
- Select B 102
- Configuration 104
- ATTENTION 105
- Table 6-14 PID Tuning 109
- Table 6-15 PID Alarms 110
- – an adjustable overlap of 111
- “AUTOCYCLE FAIL ALARM” 116
- On-Line mode 116
- 2 Labels 123
- Label/Time 123
- Date/Time 123
- *ATTENTION 125
- 7 Inputs and Outputs Wiring 126
- 7.3 Inputs and Outputs 129
- Inside case with door open 130
- HPW7000 136
- HB Series pH or ORP 137
- 7.6 Conductivity 142
- 7.7 Dissolved Oxygen 143
- 7.8 Communications Card 145
- 7.9 Outputs 146
- 7.10 Option Card 147
- 8 Input Calibration 148
- 8.2 Calibration Menu 149
- Conductivity 150
- 8.5 pH Calibration 152
- Input Calibration 153
- Input Calibration 154
- Refer to Section 6.4.1 – 155
- Error Messages: 157
- Calibrate 158
- Percent Theoretical Slope 159
- Adjustment 159
- • Put the unit in “Hold” 161
- • DO NOT Remove the 161
- 8.6 ORP Calibration 163
- – Table 164
- Step Action Screen 166
- 8.7 Conductivity Calibration 169
- Procedure 172
- In the same screen as “ 174
- 8.7.7 Cation pH Calibration 175
- Overview 178
- Running a Probe Bias Scan 184
- Test initiation 184
- Display Graph 185
- “IN1 DO CAL” 188
- Reset Bias Volts” 189
- 9 Outputs Calibration 190
- 9.2 Output Calibration 191
- WARNING 192
- • Use the keys to 194
- • Use the keys to move 194
- • Repeat as required to 194
- • When all digits have been 194
- Outputs Calibration 195
- 20mA Offset 196
- Reset 4mA Offset” 196
- 10.1 Overview 197
- ” Input Temp Cal” 198
- (Read only) 199
- 11 Calibration History 201
- Overview 201
- • Press 202
- 12 Diagnostics and Messages 203
- Table 12-1 Status Messages 204
- Status Message Definition 205
- Fail Message Reason 206
- 12.5 Pharma Fail Messages 207
- Condition 207
- 13.1 Overview 208
- 14.1 Overview 209
- 14.2 Part Numbers 210
- 15 Appendices 211
- Appendices 213
- [Titanium Cells] 214
- Raise pH and oxidize cyanide 217
- Titration curve 217
- Appendices 218
- Batch Treatment 219
- Use of Chromates 220
- Ion Exchange 224
- Reverse Osmosis 224
- Parts Rinsing 225
- Steam Power Measurements 226
- Softener Monitor 226
- (For Conductivity) 228
- Cell Constant 229
- Hints for Reducing Noise 230
- Measurement 234
- Measured DO Currents 235
- Faradaic Interferences 236
- Sulfite Based Zero Testing 236
- Temperature 237
- Solubility 237
- (ppm, mg/L) 237
- Equipment Needed 239
- Oxygen Measurement Procedure 239
- To Calculate True Value 240
- Example Calculation 240
- Recommendations 241
- Cleaning 243
- Figure 15-9 243
- Calibration 243
- Low Dissolved Oxygen 243
- Figure 15-9 Auto Clean Setup 244
- Figure 15-10 Auto Cal Setup 245
- Index 248
- Two-Point AutoCal Operation* 249
- Two-Point Calibration 249
- W, X, Y, Z 255
- SE Asia Countries 258
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