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1720E
User Manual
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Hach 1720E User Manual

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Catalog Number 6010018
1720E Low Range Turbidimeter
USER MANUAL
04/2016, Edition 8
1
Table of Contents
Section 2 General Information ............................................................................................................................... 5
2.1 Safety Information ............................................................................................................................................... 5
2.1.1 Use of Hazard Information......................................................................................................................... 5
2.1.2 Precautionary Labels................................................................................................................................. 5
2.1.3 General Product Information ..................................................................................................................... 5
2.2 Theory of Operation............................................................................................................................................ 6
3.1 Connecting/Wiring the Sensor to the sc100 Controller ....................................................................................... 7
3.1.1 Attaching a sc Sensor with a Quick-connect Fitting .................................................................................. 7
3.1.2 Hard-wiring a sc Sensor to the sc100 Controller....................................................................................... 8
3.2 Connecting the Sensor to the sc1000 Controller ................................................................................................ 9
3.2.1 Connecting the Sensor using the Quick-connect Fittings.......................................................................... 9
3.3 Turbidimeter Installation Information ................................................................................................................... 9
3.3.1 Mounting the Turbidimeter Body.............................................................................................................. 11
3.3.2 Installing the Head Assembly .................................................................................................................. 11
3.4 Installing a Sample Line.................................................................................................................................... 11
3.5 Sample Connections ......................................................................................................................................... 12
Section 4 System Startup..................................................................................................................................... 13
4.1 General Operation............................................................................................................................................. 13
4.2 Starting Sample Flow........................................................................................................................................ 13
Section 5 Operation .............................................................................................................................................. 15
5.1 Sensor Setup .................................................................................................................................................... 15
5.2 Sensor Data Logging ........................................................................................................................................ 15
5.3 Sensor Diagnostics Menu ................................................................................................................................. 15
5.4 Sensor Setup Menu .......................................................................................................................................... 16
5.5 Sensor Calibration and Verification................................................................................................................... 16
5.5.1 User-prepared Calibration ....................................................................................................................... 17
5.5.2 Calibration with StablCal
® .......................................................................................................................................................18
5.5.3 Instrument Verification ............................................................................................................................. 19
5.5.3.1 Dry Verification............................................................................................................................... 19
5.5.3.2 Wet Verification .............................................................................................................................. 19
5.6 Calibration and Verification History ................................................................................................................... 20
5.7 Offset Feature ................................................................................................................................................... 20
5.7.1 Setting the Offset..................................................................................................................................... 21
Section 6 Maintenance ......................................................................................................................................... 23
6.1 Maintenance Schedule ..................................................................................................................................... 23
6.2 Removing a Sensor from the System ............................................................................................................... 23
6.3 Reinstalling a Sensor on the System ................................................................................................................ 23
6.4 Cleaning............................................................................................................................................................ 24
6.4.1 Cleaning the Photocell Window............................................................................................................... 24
6.4.2 Cleaning the Turbidimeter Body and Bubble Trap ................................................................................... 24
6.4.3 Replacing the Lamp Assembly................................................................................................................ 25
Section 7 Troubleshooting ................................................................................................................................... 27
7.1 Error Codes....................................................................................................................................................... 27
7.2 Warnings........................................................................................................................................................... 27
7.3 Event Codes...................................................................................................................................................... 29
2
Table of Contents
Section 8 Replacement Parts and Accessories..................................................................................................31
8.1 Replacement Items............................................................................................................................................31
8.2 Optional Accessories.........................................................................................................................................31
8.3 Calibration and Verification Standards and Accessories ................................................................................... 32
Section 9 Compliance Information ...................................................................................................................... 33
Appendix A Modbus Register Information..........................................................................................................35
3
Section 1 Specifications
Specifications are subject to change without notice.
Table 1 1720E Low Range Specifications
Range 0–100 nephelometric turbidity units (NTU)
Measurement Units mg/L, NTU, TE/F, FTU, Degree
Accuracy
1
± 2% of reading or ± 0.02 NTU (whichever is greater) from 0 to 40 NTU; ± 5% of reading from 40 to 100 NTU (when calibration is performed at 20.0 NTU with the offset turned off).
Linearity
1
Better than 1% 0–40 NTU on formazin. Allows for accurate calibration at high turbidity values.
Resolution (Displayed)
0.0001 NTU up to 9.9999 NTU; 0.001 NTU from 10.000 to 99.999 NTU; 0.01 NTU at 100.00 NTU
Repeatability Better than ±1.0% of reading or ±0.002 NTU, whichever is greater
Response Time
For a full-scale step change, initial response in 1 minute, 15 seconds. Varies with flow rate, see the table below. The response time is also dependent on the signal averaging time, which is user selectable.
Sample Flow Required 250 to 750 mL/minute
Storage Temperature –20 to 60 °C (–4 to 140 °F)
Operating Temperature 0 to 50 °C (32–122 °F) for single sensor system, 0 to 40 °C (32–104 °F) for two sensor system
Sample Temperature Range
0 to 50 °C
Operating Humidity 5 to 95% non-condensing
Power Requirements 12 VDC ± 5%, 12.5 Watts maximum
Sample Inlet Fitting
1
/8 barb fitting to ¼-inch NPT male adapter
Signal Average Time no averaging, 6, 30, 60, and 90 seconds, user selectable. Default is 30 seconds.
Dimensions Turbidimeter body and cap: 25.4 x 30.5 x 40.6 cm (10 x 12 x 16 inches)
Sensor Cable Length 1.8 m (5.9 ft); optional 7.62 m (25 ft)
Mounting Options Turbidimeter Body and Head Assembly: Wall; floor stand
Shipping Weight
1720E Series 2 Turbidimeter and Controller: 6.31 kg (13.5 lb); 1720E Turbidimeter only: 4.71 kg (10 lb)
Calibration Methods
1. StablCal
®
(stabilized formazin) – primary or wet calibration of the instrument.
Recommended at 20.0 NTU.
2. Formazin – user-prepared primary or wet calibration of the instrument. Recommended at
20.0 NTU.
3. Multi-sensor calibration – Performed with a specialized calibration procedure for up to eight sensors on a single set of fresh StablCal® standards.
% Step Change
Flow Rate
750 500 250
10 1¼ minutes 1½ minutes 2½ minutes 50 2 minutes 2½ minutes 6 minutes 90 3½ minutes 3½ minutes 9 minutes 99 4 minutes 5 minutes 12 minutes
4
Specifications
Verification (Wet) Method
1. StablCal
®
(stabilized formazin) – recommended for verification in the appropriate application range of measurement. For regulatory verification, standards of 0.1 to 50 NTU.
2. Formazin – fresh user-prepared standard
Verification (Dry) Method
1. ICE-PIC™ Verification Module with factory-set values of 20.0 or 1.0 ±25%. Unique value
is assigned when dry verification is done immediately after calibration and is used as pass/fail criteria for subsequent verifications.
Recommended Maintenance
1. Lamp replacement: once per year.
2. Cleaning: mandatory before calibration, optional before calibration, and mandatory upon
verification failure.
Installation Environment Indoor
Primary Compliance Method
USEPA 180.1; Hach Method 8195; ASTM D 6698; Standard Methods 2130B
Limit of Detection
1
0.0032 NTU (according to criteria specified by ISO 15839)
1
All specifications are based on a calibration with 20.0 NTU formazin and with the offset turned off.
Table 1 1720E Low Range Specifications (continued)
5
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.
To ensure that the protection provided by this equipment is not impaired, 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 the 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.
2.1.3 General Product Information
The 1720E Turbidimeter is a continuous-reading nephelometric turbidimeter designed for low-range turbidity monitoring. This process turbidimeter is capable of measuring turbidity from 0.001 to 100.0 NTU. Calibration is based on formazin, the primary turbidity reference standard adopted by the APHA Standard Methods for the Examination of Water and Wastewater and the U.S. Environmental Protection Agency (EPA) and on StablCal
®
which
is also recognized as a primary standard.
The 1720E Turbidimeter can be operated using an sc controller. Refer to the Operation section (Section 5 on page 15) for more information.
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).
6
General Information
2.2 Theory of Operation
The 1720E Turbidimeter measures turbidity by directing a strong beam of collimated light from the sensor head assembly down into the sample in the turbidimeter body. Light scattered at 90° relative to the center line of incident light by suspended particles in the sample is detected by the submerged photocell (Figure 1).
The amount of light scattered is proportional to the turbidity of the sample. If the turbidity of the sample is negligible, little light will be scattered and detected by the photocell and the turbidity reading will be low. High turbidity, on the other hand, will cause a high level of light scattering and result in a high reading.
Sample enters the turbidimeter body and flows through the baffle network of the bubble trap. The flow allows bubbles to either cling to surfaces of the baffle system or rise to the surface and vent to atmosphere. After traveling through the bubble trap, sample enters the center column of the turbidimeter body, rises into the measuring chamber and spills over the weir into the drain port. A reading is taken once per second.
Figure 1 90 Degree Detector
1. Lamp 3. Aperture 5. 90° Detector
2. Lens 4. Water Level
7
Section 3 Installation
DANGER Only qualified personnel should conduct the tasks described in this section of the manual. The 1720E/sc100 product configuration is not intended for installation in hazardous locations.
3.1 Connecting/Wiring the Sensor to the sc100 Controller
3.1.1 Attaching a sc Sensor with a Quick-connect Fitting
The sensor cable is supplied with a keyed quick-connect fitting for easy attachment to the controller, see Figure 2. Retain the connector cap to seal the connector opening in case the sensor must be removed. The 1720E sensor cable may be extended by a maximum of
7.62 m (25 ft), see Replacement Parts and Accessories on page 31.
Figure 2 Attaching the Sensor using the Quick-connect Fitting
8
Installation
3.1.2 Hard-wiring a sc Sensor to the sc100 Controller
1. Disconnect power to the controller if powered.
2. Open the controller cover.
3. Disconnect and remove the existing wires between the quick-connect and terminal
strip J5, see Figure 3.
4. Remove the quick-connect fitting and wires and install the threaded plug on the opening to maintain the environmental rating.
5. Cut the connector from the sensor cable.
6. Strip the insulation on the cable back 1-inch. Strip ¼-inch of each individual wire end.
7. Pass the cable through conduit and a conduit hub or a strain relief fitting
(Cat. No. 16664) and an available access hole in the controller enclosure. Tighten the fitting.
Note: Use of strain relief fitting other than Cat. No. 16664 may result in a hazard. Use only the recommended strain relief fitting.
8. Reinstall the plug on the sensor access opening to maintain the environmental rating.
9. Wire as shown in Table 2 and Figure 3.
10. Close and secure the cover.
Table 2 Wiring the Sensor at Terminal Block J5
Terminal Number Terminal Designation Wire Color
1 Data (+) Blue 2 Data (–) White 3 Service Request No Connection 4 +12 V dc Brown 5 Circuit Common Black 6 Shield Shield (grey wire in existing quick disconnect fitting)
9
Installation
Figure 3 Hard-wiring the Sensor
3.2 Connecting the Sensor to the sc1000 Controller
3.2.1 Connecting the Sensor using the Quick-connect Fittings
1. Unscrew the connector cap from the controller. Retain the connector cap to seal the
connector opening in case the sensor must be removed.
2. Push the connector into the socket.
3. Hand-tighten the union nut.
Note: Do not use the middle connection for the sensors as this is reserved for the display module.
3.3 Turbidimeter Installation Information
The turbidimeter body is designed for wall-mounting (although it may be mounted on the optional floor stand). The turbidimeter sensor must be mounted within six feet of the controller unless an extension cable is used. Maximum cable length is 9.6 m (31 feet).
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
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
RELAY3RELAY2RELAY1
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
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 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
RELAY3RELAY2RELAY1
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
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
10
Installation
Figure 4 1720E Dimensions
11
Installation
3.3.1 Mounting the Turbidimeter Body
Locate the turbidimeter as close to the sampling point as possible. A shorter distance for the sample to travel results in a faster response time.
Clean the turbidimeter body and bubble trap before installation using the instructions supplied in section 6.4.2 on page 24. Slotted mounting brackets are integral parts of the turbidimeter body. Install customer-supplied hardware appropriate for the installation environment using the criteria detailed below:
• Install in a location that is isolated from vibration.
• Allow at least 22 cm (approximately 10 inches) clearance for removal of the head
assembly and bubble trap cover from the top of the turbidimeter body.
• Leave enough room below the turbidimeter body to remove the bottom plug and to
place a container under the drain when calibrating or cleaning.
Note: Make sure the top of the turbidimeter body is level.
• Install two ¼-20 bolts 10-3/4 inches apart (on center). Leave at least ¼-inch of the bolt
head exposed.
• Make sure the bolts are installed level. Slide the slotted mounting brackets of the turbidimeter body onto the bolts.
3.3.2 Installing the Head Assembly
After the turbidimeter body has been mounted, install the bubble trap cover, then place the head assembly on the turbidimeter body with the label facing the front. Move the head assembly back and forth slightly to ensure it is properly seated on the body of the instrument. Failure to properly seat the head will result in light leakage and erroneous readings.
The rear portion of the head assembly has a molded “lip” which may be used to hang the head assembly on the turbidimeter body edge for routine maintenance.
3.4 Installing a Sample Line
DANGER This turbidimeter is not designed for use in hazardous locations or with samples that are flammable or explosive in nature. If any sample solution other than water is used in this product, test the sample/product compatibility to ensure user safety and proper product performance.
One-fourth inch OD rigid or semi-rigid tubing is recommended for sample lines. Run them as directly as possible between the turbidimeter body and the sampling point to minimize sample flow lag time.
Install sample line taps into larger process pipes to minimize interference from air bubbles or pipeline bottom sediment. A tap projecting into the center of the pipe is ideal. Figure 5 shows examples of sample tap installations.
Note: When setting the flow rate, take care to avoid sweeping air “micro-bubbles” through the internal bubble trap. Observe the sample flow inside the turbidimeter body. If small air bubbles can be seen flowing up through the center, reduce the flow rate.
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