Hach Sension 156 User manual

Cat. No. 54650-18
Portable Multiparameter
Meter Manual
© Hach Company, 2000, 2001. All rights reserved. Printed in the U.S.A. te/dk 5/01 2ed

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TABLE OF CONTENTS
SAFETY PRECAUTIONS ....................................................................................................... 7
SPECIFICATIONS.................................................................................................................... 9
OPERATION........................................................................................................................13
SECTION 1 INTRODUCTION...................................................................................... 15
1.1 Unpacking the Instrument................................................................................................. 15
1.1.1 Standard Accessories............................................................................................... 15
1.1.2 Optional Accessories............................................................................................... 16
1.2 Keypad Description........................................................................................................... 16
1.3 Screen Description and Layout......................................................................................... 18
1.4 Maintenance...................................................................................................................... 20
1.5 Audible Signals................................................................................................................. 20
SECTION 2 INSTRUMENT SETUP............................................................................ 21
2.1 Instrument Description...................................................................................................... 21
2.2 Power Connection ............................................................................................................. 21
2.2.1 Using the Docking Station as a Power Source ........................................................ 21
2.2.2 Docking Station Connections.................................................................................. 23
2.2.3 Using Batteries as a Power Source.......................................................................... 23
2.3 Probe Connections............................................................................................................. 24
2.3.1 Switching Between Conductivity and Dissolved Oxygen Modes........................... 24
2.3.2 Attaching the Probe Holder to the Instrument......................................................... 25
2.4 Turning the Meter On........................................................................................................ 25
2.5 Setup Menu Features Common to All Parameters............................................................ 25
2.6 Printer and Computer Connections................................................................................... 26
2.7 Automatic Shut-off Function ............................................................................................ 26
2.8 Display Backlight.............................................................................................................. 26
SECTION 3 pH OPERATION MODE......................................................................... 27
3.1 pH Setup Menu Options.................................................................................................... 27
3.2 How to Change the pH Menu Options.............................................................................. 28
3.3 pH Calibration................................................................................................................... 30
3.3.1 Performing a Calibration Using Automatically Recognized Buffers...................... 30
3.3.2 Performing a Manual Calibration............................................................................ 31
3.3.3 Reviewing the Calibration....................................................................................... 32
3.4 Measuring Samples........................................................................................................... 33
3.5 Millivolt Measurement...................................................................................................... 33

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TABLE OF CONTENTS, continued
SECTION 4 CONDUCTIVITY OPERATION MODE............................................ 35
4.1 Conductivity Setup Menu Options ................................................................................... 35
4.2 How to Change the Conductivity Menu Options.............................................................. 38
4.3 Conductivity Calibration................................................................................................... 39
4.3.1 Calibrating with a Known NaCl Standard............................................................... 40
4.3.2 Calibrating with a Known KCl Standard ................................................................ 41
4.3.3 Calibrating by Adjusting the Cell Constant ............................................................ 41
4.3.4 Reviewing Calibrations........................................................................................... 42
4.4 Measuring Conductivity ................................................................................................... 43
4.4.1 Measuring Low Levels of Conductivity.................................................................. 43
4.5 Measuring Total Dissolved Solids.................................................................................... 44
4.6 Measuring Salinity............................................................................................................ 44
4.7 Substances that May Affect Measurement ....................................................................... 45
4.8 Common Conversion Factors............................................................................................ 45
4.9 Theory of Conductivity Measurement.............................................................................. 46
SECTION 5 DISSOLVED OXYGEN OPERATION MODE.................................. 49
5.1 Dissolved Oxygen Setup Menu Options........................................................................... 49
5.2 How to Change the Dissolved Oxygen Menu Options..................................................... 49
5.3 DO Probe .......................................................................................................................... 50
5.3.1 Probe Assembly....................................................................................................... 50
5.4 Dissolved Oxygen Calibration.......................................................................................... 52
5.4.1 Probe Polarization................................................................................................... 52
5.4.2 Zeroing the Probe.................................................................................................... 53
5.4.3 Calibration in Water Saturated Air.......................................................................... 54
5.4.4 Calibration to a Known Dissolved Oxygen Concentration..................................... 55
5.4.5 Calibrating a Sample to Read 100% Saturation...................................................... 56
5.4.6 Calibration Review.................................................................................................. 57
5.5 Measuring Dissolved Oxygen........................................................................................... 58
5.5.1 General Probe Operation......................................................................................... 58
5.5.2 Dissolved Oxygen Measurement ............................................................................ 58
5.5.3 Probe Storage .......................................................................................................... 59
5.5.4 Maintenance............................................................................................................ 60
5.6 Using the BOD Accessory Kit.......................................................................................... 60
5.7 Making BOD Determinations........................................................................................... 61
5.8 Measuring Dissolved Oxygen in Water (0 to 20 mg/L).................................................... 61
5.9 Salinity Correction Factors............................................................................................... 66
5.10 Pressure Conversions...................................................................................................... 67

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TABLE OF CONTENTS, continued
SECTION 6 STORING AND RECALLING DATA.................................................. 69
6.1 Storing Measurements....................................................................................................... 69
6.2 Recalling Stored Data........................................................................................................ 70
6.2.1 pH Data.................................................................................................................... 71
6.2.2 Conductivity Data.................................................................................................... 71
6.2.3 Dissolved Oxygen Data........................................................................................... 72
6.3 Erasing Data...................................................................................................................... 72
6.3.1 Erasing Single Data Points ...................................................................................... 72
6.3.2 Erasing Multiple Data Points................................................................................... 73
SECTION 7 PRINTING AND DATA TRANSFER................................................... 75
7.1 Connecting to Printers/Computers.................................................................................... 75
7.1.1 RS232 Cable Description ........................................................................................ 75
7.1.2 Connecting to a Printer............................................................................................ 75
7.1.3 Connecting to a Personal Computer........................................................................ 77
7.1.4 Using HachLink™ Communications Software with a PC ...................................... 78
7.2 Sending Data to Printers/Computers................................................................................. 78
7.2.1 Sending Currently Displayed Data.......................................................................... 78
7.2.2 Sending Recalled Data Points.................................................................................. 78
7.2.3 Sending Multiple Data Points.................................................................................. 79
7.3 Printed Data Formats......................................................................................................... 80
7.3.1 pH Printed Data Format........................................................................................... 80
7.3.2 Conductivity Printed Data Format........................................................................... 80
7.3.3 Dissolved Oxygen Printed Data Format.................................................................. 80
SECTION 8 TROUBLESHOOTING............................................................................ 81
8.1 Error Codes ....................................................................................................................... 81
8.2 Meter Service Request Questionnaire............................................................................... 82
GENERAL INFORMATION...........................................................................................83
REPLACEMENT PARTS AND ACCESSORIES.................................................................. 85
HOW TO ORDER................................................................................................................... 89
REPAIR SERVICE.................................................................................................................. 90
WARRANTY .......................................................................................................................... 91
CERTIFICATION ................................................................................................................... 93

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SAFETY PRECAUTIONS
Section 2.2 Power Connection
Section 2.3 Probe Connections
Section 2.6 Printer and Computer Connections
Section 7.1 Connecting to Printers/Computers

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SPECIFICATIONS
Specifications subject to change without notice.
General Specifications
Display: Custom LCD
Inputs:
(1) 5-pin Hach pH/mV/temperature probe connector
(1) 5-pin Hach conductivity or dissolved oxygen probe connector
Outputs: RS232 via Docking Station
Power requirements:
Meter: 4 AA alkaline batteries or via Docking Station
Docking Station: 6–12 V dc; use either Hach-supplied 115
or 230 V, 50/60 Hz external power supply or a
customer-provided supply with 50 mA output, 5.5-mm power
plug with a 2.5 mm center post (positive).
Input impedance: >10l2 ohms
Installation Category: II (for 115V and 230V external
power supplies)
Environmental Requirements: 0–50 °C at 85% non-condensing
relative humidity
Meter dimensions: 21.2 x 8.7 x 4.2 cm (8.35 x 3.43 x 1.65 inches)
Enclosure:Waterproof (designed to meet IP67), chemical-
resistant, dust proof; meter will float. Docking station is water-
resistant to IP40.

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SPECIFICATIONS, continued
pH Mode
Range:-2.00–19.99
Resolution (selectable): 0.001/0.01/0.1
Slope (meter allowable): 48–65 mV/decade
Instrument Drift: <40 µV/°C
Input Bias Current: -1 pico amp ≤input bias ≤1 pico amp at
25 °C; ±4 picoamp over full range
Millivolt Mode Range: -2000–2000 mV
Resolution: 0.1 mV
Accuracy (meter only): ±0.2 mV or ±0.15% of the reading,
whichever is greater
Temperature Range: -10.0–110 °C
Resolution: 0.1 °C
Accuracy: ±0.3 °C from 0–70 °C; ±1.0 °C from 70–110 °C
Conductivity Mode Range: 0–19.99 µS; 20–199.9 µS/cm; 200–1999 µS/cm;
2–19.99 mS/cm; 20–199.9 mS/cm
TDS: 0–50,000 mg/L as NaCl
Salinity: 0–42 ppt (‰)
Temperature: -10–105 °C
Resolution:
Conductivity:
0.00–19.99 µS/cm 0.01 µS/cm
20.0–199.9 µS/cm 0.1 µS/cm
200–1999 µS/cm 1 µS/cm
2.00–19.99 mS/cm 0.01 mS/cm
20.0–199.9 mS/cm 0.1 mS/cm