Hach 5740sc User manual

Visit http://www.hach.com
客服：400 688 9809

Catalog Number 6120018
Model 5740sc Galvanic Membrane
Dissolved Oxygen Sensor
USER MANUAL
May 2005, Edition 2
©Hach Company, 2004–2005. All rights reserved. Printed in the U.S.A.
eac/dp
客服：400 688 9809

3
Table of Contents
Section 1 Specifications......................................................................................................................................... 5
Section 2 General Information............................................................................................................................... 7
2.1 Safety Information............................................................................................................................................... 7
2.1.1 Use of Hazard Information......................................................................................................................... 7
2.1.2 Precautionary Labels................................................................................................................................. 7
2.2 General Sensor Information................................................................................................................................ 7
2.3 Theory of Operation............................................................................................................................................ 8
Section 3 Installation.............................................................................................................................................. 9
3.1 Connecting/Wiring the Sensor to the sc100........................................................................................................ 9
3.1.1 Hard-wiring the Sensor to the sc100 Controller......................................................................................... 9
3.2 Connecting the Sensor to the sc1000............................................................................................................... 10
3.3 Installing the Sensor in the Sample Stream...................................................................................................... 11
3.3.1 Sensor Installation Requirements............................................................................................................ 11
Section 4 sc100 Operation ................................................................................................................................... 13
4.1 Using the sc100 Controller................................................................................................................................ 13
4.1.1 sc100 Display Features ........................................................................................................................... 14
4.1.2 Important Key Presses ............................................................................................................................ 14
4.2 Sensor Setup .................................................................................................................................................... 15
4.2.1 Changing the Sensor Name .................................................................................................................... 15
4.2.2 Sensor Data Log...................................................................................................................................... 15
4.2.2.1 Sensor Data Logging ..................................................................................................................... 15
4.2.3 Pressure and Elevation............................................................................................................................ 16
4.2.4 Selecting Atmospheric Pressure Units.................................................................................................... 16
4.2.4.1 Atmospheric Pressure Units Procedure......................................................................................... 16
4.3 Sensor Diagnostics Menu................................................................................................................................. 17
4.4 Sensor Setup Menu .......................................................................................................................................... 17
4.5 Calibration......................................................................................................................................................... 19
4.5.1 Calibration in Air ...................................................................................................................................... 19
4.5.2 Sample Calibration .................................................................................................................................. 20
4.5.3 Concurrent Calibration of Two Sensors................................................................................................... 21
Section 5 sc1000 Operation................................................................................................................................. 23
5.1 Using the sc1000 Controller.............................................................................................................................. 23
5.1.1 Display Features...................................................................................................................................... 23
5.1.1.1 Using the Pop-up Toolbar.............................................................................................................. 23
5.1.1.2 Using the Menu Windows .............................................................................................................. 23
5.1.1.3 Navigating the Menu Windows....................................................................................................... 24
5.2 Sensor Setup .................................................................................................................................................... 26
5.3 Sensor Data Logging ........................................................................................................................................ 27
5.4 Pressure and Elevation..................................................................................................................................... 27
5.4.1 Selecting Atmospheric Pressure ............................................................................................................. 28
5.5 Sensor Status Menu.......................................................................................................................................... 28
5.6 Sensor Setup Menu .......................................................................................................................................... 28
5.7 Calibration......................................................................................................................................................... 30
5.7.1 Calibration in Air ...................................................................................................................................... 30
5.7.2 Sample Cal—Calibration by Comparison to a Winkler Titration.............................................................. 31
5.7.3 Sample Cal—Calibration by Comparison to a Hand-held DO Analyzer.................................................. 32
5.7.4 Concurrent Calibration of Two Sensors................................................................................................... 32
客服：400 688 9809

4
Table of Contents
Section 6 Maintenance..........................................................................................................................................35
6.1 Maintenance Schedule......................................................................................................................................35
6.2 Cleaning the Sensor..........................................................................................................................................35
6.2.1 Cleaning the Galvanic Sensor..................................................................................................................35
6.3 Preventing the Sensor Membrane from Drying Out...........................................................................................35
6.4 Replacing the Sensor Assembly........................................................................................................................36
Section 7 Troubleshooting....................................................................................................................................37
7.1 Error Codes.......................................................................................................................................................37
7.2 Warnings ...........................................................................................................................................................37
7.3 Sensor Troubleshooting.....................................................................................................................................37
Section 8 Replacement Parts ...............................................................................................................................39
8.1 Replacement Items............................................................................................................................................39
8.2 Accessories.......................................................................................................................................................39
Section 9 How to Order.........................................................................................................................................41
Section 10 Repair Service.....................................................................................................................................42
Section 11 Limited Warranty ................................................................................................................................43
Section 12 Compliance Information ....................................................................................................................45
客服：400 688 9809

5
Section 1 Specifications
Specifications are subject to change without notice.
Components Corrosion-resistant materials, fully-immersible probe with 10 m (30 ft) cable
Measuring Range (Dissolved Oxygen) 0 to 40 ppm (0 to 40 mg/L) or 200% saturation
Measuring Range (Temperature) –5 to 50 °C (23–120 °F)
Probe Operating Temperature –5 to 50 °C (23–120 °F)
Probe Storage Temperature –5 to 70 °C (23–158 °F); 95% relative humidity, non-condensing
Response Time at 20 °C 120 seconds to 90% of value upon step change
Measurement Accuracy ±2% of span
Temperature Accuracy ±0.2 °C
Temperature Compensator 30K NTC Thermistor
Repeatability ±0.5% of span
Sensitivity ±0.5% of span
Calibration Air/Sample
Maximum Pressure 10 bar (145 psi)
Sensor Interface ModBUS; ProfiBus
Probe Cable Length Integral 33 ft (10 m)
Probe Weight 0.26 kg (9.1 oz)
Probe Dimensions See Figure 3 Probe Dimensions on page 11.
Wetted Materials Noryl, PVC, Viton, Polypropylene, Nylon
Electrode Materials Nickel-chrome and lead
Minimum Flow Rate 0.5 cm/s (0.016 ft/s)
Measuring Principle Galvanic
客服：400 688 9809

Visit us at www.hach.com
客服：400 688 9809

7
Section 2 General Information
2.1 Safety Information
Please read this entire manual before unpacking, setting up, or operating this equipment.
Pay attention to all danger and caution statements. Failure to do so could result in serious
injury to the operator or damage to the equipment.
Do not use or install this equipment in any manner other than that specified in this manual.
2.1.1 Use of Hazard Information
DANGER
Indicates a potentially or imminently hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate
injury.
Important Note: Information that requires special emphasis.
Note: Information that supplements points in the main text.
2.1.2 Precautionary Labels
Read all labels and tags attached to the instrument. Personal injury or damage to the
instrument could occur if not observed
2.2 General Sensor Information
The Galvanic Membrane Dissolved Oxygen Sensor allows aqueous samples to be easily
and accurately analyzed for dissolved oxygen concentration. The system consists of a
controller with an integrated display and a sensor for in-situ measurement.
The sensor can be using the sc100 (Section 4 on page 13) or sc1000 controller.
Optional equipment, such as mounting hardware for the probe, is supplied with
instructions for all user installation tasks. Several mounting options are available, allowing
the probe to be adapted for use in many different applications.
Typical applications include aeration basins, nutrient removal in equalization basins,
aerobic and anaerobic digesters, effluent streams, rivers, lakes, and fish ponds.
This symbol, if noted on the instrument, references the instruction manual for operation and/or safety information.
This symbol, when noted on a product enclosure or barrier, indicates that a risk of electrical shock and/or
electrocution exists.
This symbol, if noted on the product, indicates the need for protective eye wear.
This symbol, when noted on the product, identifies the location of the connection for Protective Earth (ground).
This symbol, when noted on the product, identifies the location of a fuse or current limiting device.
客服：400 688 9809

8
General Information
2.3 Theory of Operation
This galvanic oxygen sensor operates as a battery generating a voltage. The resulting
voltage is directly proportional to the dissolved oxygen concentration. The cell is
constructed with a fine wire coil cathode wrapped around a lead anode. A salt solution fills
the void between the anode and cathode. The sensor is contained by a cylindrical
membrane held in close proximity to the wire coil.
Oxygen from the solution to be tested enters the cell by diffusion through the membrane
and then across the thin electrolyte layer to the cathode. The oxygen is reduced at the
cathode as shown in reaction 1.
1.
The cathode is at such a negative potential that it reduces all the oxygen that diffuses to its
surface. The lead anode is oxidized to give an overall reaction that produces lead
hydroxide as shown in reaction 2.
2.
The overall result of this reaction is the consumption of the lead anode as current flows,
yielding a very sensitive electrode that can detect changes at the microvolt level.
O22H2O4e
–
++ 4OH– →
2Pb 4OH– +2Pb OH()
24e–
+→
客服：400 688 9809

9
Section 3 Installation
DANGER
Only qualified personnel should conduct the installation tasks described in this
section of the manual.
3.1 Connecting/Wiring the Sensor to the sc100
The sensor cable is supplied with a keyed quick-connect fitting for easy attachment to the
controller, see Figure 1. Retain the connector cap to seal the connector opening in case
the sensor must be removed. Optional extension cables may be purchased to extend the
sensor cable length. If the total cable length exceeds 100 m (300 ft), a termination box
must be installed. See Replacement Parts on page 39.
Figure 1 Attaching the Sensor using the Quick-connect Fittings
3.1.1 Hard-wiring the Sensor to the sc100 Controller
1. Open the controller cover.
2. Disconnect and remove the existing wires between the quick connect and terminal
strip J5, see Figure 2.
3. Remove the quick-connect fitting and wires and install the threaded plug on the
opening to maintain the environmental rating.
4. Cut the connector from the sensor cable.
5. Strip the insulation on the cable back 1-inch. Strip ¼-inch of each individual wire end.
6. Pass the cable through conduit and a conduit hub or a strain relief fitting and an
available access hole in the controller enclosure. Tighten the fitting.
7. Reinstall the plug on the sensor access opening to maintain the environmental rating.
8. Wire as shown in Table 1.
9. Close and secure the controller cover.
NCNCNC COMCOMCOM NO
F1
F2
NONO
RELAY CRELAY BRELAY A
J1
J2
J4
S1
NETWORK
INTERFACE
CARD
J3
J5
J6
U5
U9
1
1
+ DATA
+ DATA
+ OUT 2
+ OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+ V
+ V
+ OUT 1
+ OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANALOG OUTPUTS
ANALOG OUTPUTS
PCB
CONNECTOR
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
DANGER - EXPLOSION HAZARD
DANGER - RISQUE D'EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
NCNCNC COMCOMCOM NO
F1
F2
NONO
RELAY CRELAY BRELAY A
J1
J2
J4
S1
NETWORK
INTERFACE
CARD
J3
J5
J6
U5
U9
1
1
+ DATA
+ DATA
+ OUT 2
+ OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+ V
+ V
+ OUT 1
+ OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANALOG OUTPUTS
ANALOG OUTPUTS
PCB
CONNECTOR
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
DANGER - EXPLOSION HAZARD
DANGER - RISQUE D'EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
J5J5
客服：400 688 9809

10
Installation
Figure 2 Hard-wiring the Sensor
3.2 Connecting the Sensor to the sc1000
1. Unscrew the protective cover on the controller socket. Retain the protective cover for
the sensor. When the sensor is removed, re-fit the protective cover.
2. Push the connector into the socket. During this process pay attention to the lugs on
the connector.
3. Hand-tighten the union nut.
Note: Do not use the middle connection for the sensors, which is reserved for the display module.
Table 1 Wiring the Sensor at Terminal Block J5
Terminal Number Terminal Designation Wire Color
J5-1 Data (+) Blue
J5-2 Data (–) White
J5-3 Service Request No Connection
J5-4 +12 V dc Brown
J5-5 Circuit Common Black
J5-6 Shield Shield (grey wire in existing quick-disconnect fitting)
1
1
+ DATA
+ DATA
+ OUT 2
+ OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+ V
+ V
+ OUT 1
+ OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANALOG OUTPUTS
ANALOG OUTPUTS
PCB
CONNECTOR
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
DANGER - EXPLOSION HAZARD
DANGER - RISQUE D'EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
NCNCNC COMCOMCOM NO
F1
F2
NONO
RELAY 3RELAY 2RELAY 1
1
1
+ DATA
+ DATA
+ OUT 2
+ OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+ V
+ V
+ OUT 1
+ OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANALOG OUTPUTS
ANALOG OUTPUTS
PCB
CONNECTOR
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
J1
J2
J4
NETWORK
INTERFACE
CARD
J3
U5
U9
S1
DANGER - EXPLOSION HAZARD
DANGER - RISQUE D'EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
1
1
+ DATA + DATA
+ OUT 2 + OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+ V + V
+ OUT 1 + OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANALOG OUTPUTSANALOG OUTPUTS
PCB
CONNECTOR
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
DANGER - EXPLOSION HAZARD
DANGER - RISQUE D'EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
NCNCNC COMCOMCOM NO
F1
F2
NONO
RELAY 3RELAY 2RELAY 1
1
1
+ DATA + DATA
+ OUT 2 + OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+ V + V
+ OUT 1 + OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANALOG OUTPUTSANALOG OUTPUTS
PCB
CONNECTOR
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
J1
J2
J4
NETWORK
INTERFACE
CARD
J3
U5
U9
S1
DANGER - EXPLOSION HAZARD
DANGER - RISQUE D'EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
J6
J5
J5J5
J5
Disconnect
Power
From Probe
客服：400 688 9809

11
Installation
3.3 Installing the Sensor in the Sample Stream
Each sensor is supplied with a sensor lockring for use with flow tee installations. Replace
the sensor protector with the lockring for those applications.
3.3.1 Sensor Installation Requirements
•Install the sensor so that the sample contacting it is representative of the entire
process.
•Mount the sensor at least 508 mm (20 inches) from the aeration basin wall, and
immerse it at least 508 mm (20 inches) into the process.
•Install the sensor so that its membrane will not be exposed to the atmosphere for more
than 24 hours.
•Do not install the sensor directly over aerators or air diffusers when located in an
aeration basin.
•Install the sensor near the outfall from an aeration basin for most effective aeration
process monitoring and control.
Install the sensor using the instructions supplied with the installation apparatus.
See Figure 3 for sensor dimensions and Figure 4 for suggested mounting configurations.
Figure 3 Probe Dimensions
37.8 mm (1.49 inches)
43.7 mm (1.72 inches)1-inch NPT
172.7 mm (6.80 inches)
203.2 mm (8.00 inches)
客服：400 688 9809

12
Installation
Figure 4 Sensor Installation Examples
客服：400 688 9809

13
Section 4 sc100 Operation
4.1 Using the sc100 Controller
The front of the controller is shown in Figure 5. The keypad consists of the eight keys
described in Table 2.
Figure 5 sc100 Display Features
1. Instrument display 5. IrDA Port
2. BACK key 6. HOME key
3. MENU key 7. ENTER key
4. RIGHT, LEFT, UP, and DOWN keys
Table 2 Controller Key Functions/Features
Number Key Function
2Moves back one level in the menu structure.
3Moves to the main menu from other menus. This key is not active in menus where a selection or
other input must be made.
4Navigates through the menus, changes settings, and increments and decrements digits.
6Moves to the Main Measurement screen from any other screen. This key is not active in menus
where a selection or other input must be made.
7Accepts an input value, updates, or accepts displayed menu options.
sc100
1
26
5
37
4
客服：400 688 9809

14
sc100 Operation
4.1.1 sc100 Display Features
When a sensor is connected and the controller is in measurement mode, the controller
display will show the current dissolved oxygen reading plus the sample temperature.
The display will flash on startup, when a sensor error has occurred and when a sensor is
calibrated.
An active system warning will cause the warning icon (a triangle with an exclamation point
inside) to be displayed on the right side of the display.
Figure 6 Display
4.1.2 Important Key Presses
•Press HOME then the RIGHT or LEFT key to display two readings when two sensors
are connected. Continue to press the RIGHT or LEFT key to toggle through the
available display options.
•Press the UP and DOWN keys to toggle the status bar at the bottom of the
measurement display to display the secondary measurement (temperature) and
output information.
•When in Menu mode, an arrow may appear on the right side of the display to indicate
that more menus are available. Press the UP or DOWN key (corresponding to the arrow
direction) to display additional menus.
1. Status bar. Indicates the sensor name and status of
relays. The relay letter is displayed when the relay is
energized.
4. Parameter
2. Main measurement 5. Warning icon area
3. Secondary measurement 6. Measurement units
8.44
SENSOR NAME:
TEMP:23.0°C ppm
O2
1
2
3
6
5
4
SENSOR NAME 1:
8.44 02 ppm
SENSOR NAME 2:
7.15 02 ppm
MAIN MEASURE
DO:
8.44 02 ppm
TEMP:
22.9°C
SENSOR NAME 1:
DO:
7.15 02 ppm
TEMP:
22.9°C
SENSOR NAME 2:
ppm
02
24:00:00
RTC:MM/DD/YY
OUTPUT1: 11.23 mA
8.44
SENSOR NAME 1:
TEMP: 22.9°C
ppm
02
7.15
SENSOR NAME 2:
TEMP: 22.9°C
ppm
02
8.44
SENSOR NAME:
TEMP:23.0°C
8.44
SENSOR NAME:
OUTPUT1: 11.19mA ppm
02
8.44
SENSOR NAME:
OUTPUT2: 9.70 mA ppm
02
ppm
02
SENSOR DIAG
SENSOR SETUP
TEST/MAINT
MAIN MENU
SYSTEM SETUP
OUTPUT SETUP
SYSTEM SETUP
NETWORK SETUP
RELAY SETUP
DISPLAY SETUP
DISPLAY SETUP
SYSTEM SETUP
LOG SETUP
SECURITY SETUP
CALCULATION
SECURITY SETUP
SYSTEM SETUP
CALCULATION
LOG SETUP
ERROR HOLD MODE
客服：400 688 9809

15
sc100 Operation
4.2 Sensor Setup
When a sensor is initially installed, the serial number of the sensor will be displayed as the
sensor name. To change the sensor name refer to the following instructions:
4.2.2 Sensor Data Log
The data logs store the measurement data at selected intervals. The data logs are stored
in a packed binary format and the event logs are stored in a CSV format. The logs can be
downloaded through the digital network port, service port, or the IrDA port. DataCom is
needed for downloading logs to a computer.
4.2.1 Changing the Sensor Name
Step Select Menu Level/Instructions Confirm
1MAIN MENU —
2SENSOR SETUP
3Highlight the appropriate sensor if more than one sensor is attached.
4CONFIGURE
5EDIT NAME
6
Select character to edit (shown in brackets). —
Scroll to appropriate character.
4.2.2.1 Sensor Data Logging
Step Select Menu Level/Instructions Confirm
1 MAIN MENU —
2 SENSOR SETUP
3 CONFIGURE
2 LOG SETUP
4 SENSOR INTERVAL
2 Scroll through the displayed options.
4 TEMP INTERVAL
2 Scroll through the displayed options.
5 SET INTERVAL
客服：400 688 9809

16
sc100 Operation
4.2.3 Pressure and Elevation
Table 3 can be used to estimate the true barometric pressure at certain elevations. The
correspondence is based on the assumption that at sea level the barometric pressure is
760 mmHg. After determining the barometric pressure from the table or obtaining it from a
local weather service, enter this value into the instrument, see section 4.2.4 on page 16.
Note: If the barometric pressure from Table 3 is entered in the meter, the altitude entered in
combination with this value must be 0 feet.
4.2.4 Selecting Atmospheric Pressure Units
Note: The SET PRESSURE setting must be correct for proper measurement of percent saturation
and proper operation of air calibration.
Table 3 Elevation Barometric Pressure
Elevation (Feet) Barometric pressure (mmHg) Elevation (Feet) Barometric pressure (mmHg)
0 760 6000 613
500 746 6500 601
1000 733 7000 590
1500 720 7500 579
2000 708 8000 568
2500 695 8500 559
3000 683 9000 548
3500 671 9500 538
4000 659 10000 527
4500 647 10500 517
5000 635 11000 506
5500 624 — —
4.2.4.1 Atmospheric Pressure Units Procedure
Step Select Menu Level/Instructions Confirm
1MAIN MENU —
2SENSOR SETUP
3Highlight appropriate sensor if more than one sensor is attached.
4CONFIGURE
5PRESSURE UNITS
6Select from the displayed options (mmHg or altitude in feet or meters).
7Main Menu or Main Measurement Screen —
客服：400 688 9809

17
sc100 Operation
4.3 Sensor Diagnostics Menu
SELECT SENSOR
ERROR LIST–See section 7.1 on page 37.
WARNING LIST–See section 7.2 on page 37.
4.4 Sensor Setup Menu
SELECT SENSOR (if more than one sensor is attached)
CALIBRATE
AIR CAL
Perform an air calibration of the sensor (slope calibration). See section 4.5.1 on page 19.
SAMPLE CAL
Enter a value for the DO concentration as determined by another sensor or independent method. The instrument
performs an offset calibration based on the entered value. See section 4.5.2 on page 20.
TEMP ADJUST
Displays the measured temperature and allows the user to adjust the temperature by ±15 °C.
DEFAULT SETUP
Restores the gain and offset values to 1.0 and 0.0, respectively, and restores the sensor code to default.
CONFIGURE
EDIT NAME
Enter up to a 10-digit name in any combination of symbols and alpha or numeric characters.
MEAS UNITS
Select the appropriate measurement units to display. Choose from: mg/L, ppm, or percent. Default: ppm
TEMP UNITS
Select Celsius (°C) or Fahrenheit (°F); Default: °C
AC FREQUENCY
Choose 50 or 60 Hz depending on the power line frequency for optimal noise rejection. Default is 60 Hz.
FILTER
Specify the number of seconds for signal averaging (0–60). Default: 0 seconds.
PRESSURE UNITS
Choose pressure units in mmHg, feet, meters. Default: mmHg
SET PRESSURE
Enter either altitude or air pressure. Correlates to the pressure units setting. Range: –5000 to 15000. Default: 760 mmHg
SALINITY UNITS
Choose from mS/cm, mMol/L, ppt, or mg/L. Default: mS/cm
SET SALINITY
User-entered value. Default: 0.00 µS/cm
LOG SETUP
Disable or choose the datalogging interval for sensor and temperature measurements. Use the arrow keys to move
through the available choices for each. Default: Disabled
客服：400 688 9809

18
sc100 Operation
CONFIGURE (continued)
TEMP ELEMENT
Choose SELECT TYPE to specify the temperature sensor that is integrated into the sensor or choose SET MANUAL to
disable automatic temperature compensation. Default temperature sensor: NTC 30K
CAL DAYS
Shows the number of days since the last calibration. Default reminder at 60 days.
SENSOR DAYS
Shows the number of days the sensor has been in service. Automatically reminds the user to replace the sensor after a
set period of time. Default reminder at 365 days. Reset counter in DIAG/TEST/RESET SENSOR menu.
DEFAULT SETUP
Resets the sensor software to default settings.
DIAG/TEST
PROBE INFO
SENSOR NAME–Displays the entered name of the sensor. Default is the sensor serial number.
SERIAL NUMBER–Serial number of the sensor.
SOFTWARE VERS–Displays the software version number.
DRIVER VERS–Displays the sensor driver version number.
CAL DATA
CAL Q VALUE–Display for service diagnostics only.
OFFSET CORR–User editable—to change the calibration offset.
LAST CAL DATE–Shows the date of the last calibration. Default: 1-1-00
SIGNALS
SENSOR SIGNAL–Displays the sensor output in mV.
SENSOR ADC COUNTS–Raw data for sensor ADC counts. Comparable to A/D counts.
TEMP ADC CNTS–Raw data for temperature ADC counts. Comparable to A/D counts.
COUNTERS
SENSOR DAYS–Cumulative days the sensor has been in use.
RESET SENSOR–Resets sensor counter.
4.4 Sensor Setup Menu
客服：400 688 9809

19
sc100 Operation
4.5 Calibration
The dissolved oxygen sensor has been calibrated at the factory (Specifications on
page 5). The calibration procedures that follow will result in an instrument offset or gain
correction and may be performed if required by your regulatory agency. The air calibration
is the most accurate method.
4.5.1 Calibration in Air
Step Select Menu Level/Instructions Confirm
1—Remove the probe from the process stream and wipe with a wet cloth to remove
debris and biological growth. —
2—Place the probe in the supplied Calibration Bag, add a small amount of water (25–50
mL) and secure the bag to the probe body. —
3— Remove the bagged probe from any heat source. . —
4MAIN MENU —
5SENSOR SETUP
6Highlight the appropriate sensor if more than one sensor is attached.
7CALIBRATE
8AIR CAL
9Choose from the available Output Mode options (Active, Hold, or Transfer).
10 — “Move the sensor to air”. The probe has been moved to air (in the calibration bag).
11 —The Air Calibration procedure will begin and “Press Enter When Stable”, the current
DO and temperature readings will be displayed.
12 —The calibration will automatically be performed when the reading stabilizes (maximum 45 minute time-out) or press ENTER to accept the currently displayed value. One of the
responses from Table 4 will be displayed:
13 Follow the prompts to return the probe to the process —
客服：400 688 9809

20
sc100 Operation
4.5.2 Sample Calibration
Step Select Menu Level/Instructions Confirm
1— Remove the probe from the process and clean it —
2— Obtain a sample solution with a known value. —
3MAIN MENU —
4SENSOR Setup
5Highlight the appropriate sensor if more than one sensor is attached.
6CALIBRATE
7SAMPLE CAL
8Choose from the available Output Mode options (Active, Hold, or Transfer). An output that has been placed in Hold or Transfer status will be automatically released when the
calibration is complete.
9— Move the clean probe to the sample.
10 The display will prompt for entry of a salinity value. Use the UP and DOWN keys to
change the digit that is flashing. Press the LEFT key to move to another digit.
11 —
The display will show “Press Enter When Stable” and the current DO and temperature
readings. When ENTER is pressed or when the reading has been accepted as stable,
the display will change to an entry screen. If ENTER is not pressed, the sensor will
determine when the reading is stable. If it is not stable within 45 minutes, the display
will show “Unable to Calibrate”.
12 When a stable reading has been accepted, the display will show “Sample Value” and
an area for entry of the sample value. Edit the displayed reading.
13 — The display will show a response from Table 4.
14 — Return the probe to the process. —
15
The display will show “Press Enter when Stabilized” and the current DO and
temperature readings. When ENTER is pressed or when the reading has been
accepted as stable, the display will change to an entry screen. If ENTER is not pressed,
the sensor will determine when the reading is stable. Two to three minutes for the
reading to stabalize is typical, however, if it has not stabilized after 45 minutes, the
display will show
“Unable to Calibrate”.
16 —When a stable reading has been accepted, the display will show “Sample Cal” and an
area for entry of the value obtained from the Winkler Titration. —
17 Main Menu or Main Measurement Screen —
客服：400 688 9809