WQ730 - Portable device YSI - Free user manual and instructions

Product Type	Portable Water Quality Meter
Brand	YSI
Model	WQ730
Dimensions (H x W x D)	19.1 cm x 8.9 cm x 3.8 cm (7.5 in x 3.5 in x 1.5 in)
Weight	0.45 kg (1.0 lb)
Power Supply	4 AA alkaline batteries (not included) or rechargeable NiMH
Battery Life	Approximately 50 hours of continuous use
Display	Backlit LCD, multi-parameter readout
Measurement Parameters	pH, Conductivity, Dissolved Oxygen (DO), Temperature
pH Range	0 to 14 pH
Conductivity Range	0 to 200 mS/cm
DO Range	0 to 20 mg/L
Temperature Range	-5 to 50 °C (23 to 122 °F)
Accuracy (pH)	±0.1 pH
Accuracy (Conductivity)	±1% of reading
Accuracy (DO)	±0.2 mg/L
Memory	Up to 500 data logs
Data Logging	Manual or automatic interval logging
Waterproof Rating	IP67 (protected against temporary immersion)
Sensor Connection	Waterproof connector for optional probes
Calibration	Auto-calibration for pH and conductivity; manual DO calibration
Warranty	1 year limited warranty
Cleaning and Maintenance	Rinse sensors with clean water after use; store in humid environment
Included Accessories	User manual, calibration screwdriver, neck strap

Frequently Asked Questions - WQ730 YSI

How do I calibrate the pH sensor on the YSI WQ730?

To calibrate the pH sensor, rinse the probe with distilled water, then immerse it in pH 7 buffer solution. Press the CAL button and wait for the reading to stabilize. Repeat with pH 4 or pH 10 buffers for a two-point calibration.

What type of batteries does the WQ730 use and how long do they last?

The WQ730 requires 4 AA alkaline or rechargeable NiMH batteries. Alkaline batteries typically last about 50 hours of continuous use. Rechargeable batteries may have shorter life depending on capacity.

Can the WQ730 measure dissolved oxygen (DO) in both mg/L and % saturation?

Yes, the meter can display DO in mg/L and % saturation. Press the UNITS button to toggle between them during measurement.

How do I replace the DO sensor cap?

First, remove the old cap by unscrewing it counterclockwise. Rinse the new cap with distilled water. Screw on the new cap hand-tight. Re-calibrate the DO sensor after replacement.

What is the maximum depth the WQ730 can be submerged?

The meter has an IP67 rating, meaning it can withstand immersion up to 1 meter for 30 minutes. Do not exceed this depth or time.

How do I transfer data logs to a computer?

Connect the WQ730 to a computer via the optional USB adapter (not included). Use the YSI Data Manager software to download and export logs to CSV or Excel.

Why does my conductivity reading show an error?

Common causes: the conductivity cell is dirty or dry, the probe is not fully immersed, or the calibration is expired. Clean the cell with a soft brush and recalibrate using a standard solution.

Can I measure temperature in Fahrenheit?

Yes, you can switch between Celsius and Fahrenheit. Press and hold the MENU key for 3 seconds, then navigate to the temperature unit setting.

How often should I replace the sensor probes?

Probe life depends on usage and maintenance. pH probes typically last 6-12 months, DO sensor caps every 6 months, and conductivity cells can last years if properly cleaned.

What do I do if the display shows 'Low Battery'?

Replace all four AA batteries immediately. If using rechargeables, ensure they are fully charged. The meter may give inaccurate readings if battery voltage is too low.

USER MANUAL WQ730 YSI

Simple black-and-white icon of a stylized storefront with wavy roof lines (no text or symbols)

Global Water

Instrumentation, Inc.

11390 Amalgam Way

Gold River, CA 95670

T: 800-876-1172

Int'l: [phone], F: [phone]

Turbidity Sensor: WQ730

Global Water

800-876-1172 • globalw.com

Congratulations on your purchase of the Global Water WQ730 Turbidity Sensor. This instrument has been quality tested and approved for providing accurate and reliable turbidity measurements. We are confident that you will find this product to be a valuable asset for your application. Should you require assistance, our technical staff will be happy to help.

Table of Contents

I.	Use and Maintenance	●	●	●	●	●	Page	3
II.	Sensor Specifications	●	●	●	●	●		4
III.	Troubleshooting	●	●	●	●	●		5
IV.	Warranty	●	●	●	●	●		6
V.	Appendix A: Turbidity Sensor Calibration				●	●		7
VI.	Appendix B: Turbidity Standard Solutions				●	●		10
VII.	Appendix C: Sensor Measurement Diagram				●	●		11
VIII.	CE Certification	●	●	●	●	●		12

Global Water

800-876-1172 • globalw.com

I. Use and Maintenance

a. The WQ730 Turbidity Sensor is a sensitive optical device and should be handled and used carefully. Avoid hitting or dropping the sensor. Avoid exposure to shock, vibration, extreme hot or cold temperatures, or sudden wide temperature changes. Transport the sensor in a safe and dry enclosure.
b. Normal maintenance requires the sensor to be checked on a regular basis. Harsh environments can permanently damage the optics of the sensor if it is left untended for long periods of time.
c. Deposits will develop on the optics over time and should be cleaned every 2-3 days for best operation. The windows can be cleaned using lint free cotton swabs and rubbing alcohol. Do not use any abrasive cleaners on the lenses or permanent damage will occur. Cleaner water requires cleaning less often, in other applications the sensor may need to be cleaned once each day.
d. The calibration of the sensor should be checked every 6 months.
e. Always turn off the power when making circuit connections.
f. Air bubbles on the lenses can greatly affect the readings. When installing, make sure that any bubbles are clear of the lenses or allow them dissipate before taking readings.
g. Under no circumstances should the sensor be disassembled. There are no internal adjustments or user serviceable parts inside. Opening the housing will permanently damage the seals and can cause serious damage to the optics. Opening the sensor will void any warrantee.
h. The stainless steel body of the WQ730 Sensor is connected to the circuit ground. When taking measurements, the body of the sensor must be in contact with the test solution or noise problems may occur.

Global Water

800-876-1172 • globalw.com

II. Sensor Specifications

a. Specifications.

Outputs: Two, 4-20mA

Ranges: 0-50 NTU (Green Wire) 0-1000 NTU (White Wire)

Accuracy: 1% of full scale

Pressure: 30 psi maximum

Power Requirements: 10-36 VDC

20ma plus sum of both 4-20

Warm Up Time: 3 seconds minimum

8 seconds recommended

Operating Temperature: 0°C to +50°C

Storage Temperature: -10^ to +60^

Dimensions: 1-1/2" diameter x 7-1/2"" long

Weight: 1 lb plus cable

b. Connections:

Red: 10-36 VDC

Black: Ground

Green: 4-20 mA low range output (50 NTU)

White: 4-20 mA high range output (1000 NTU)

Note: The stainless steel body of the sensor is connected to

the circuit ground and must be in contact v s o l u t i o n .

Warning: Always turn off the power when connecting or disconnecting the sensor or it could be damaged.

Global Water

800-876-1172 • globalw.com

III. Trouble Shooting

There are no user serviceable parts inside this sensor

Issue: Sensor reading incorrectly

a. Clean the sensor windows using a lint free cotton swab and rubbing alcohol.
b. Verify there are no air bubbles blocking the lenses.
c. Check the sensor's calibration, see appendix A.

Other issues

d. Refer to the manual for proper set-up; check all connections and batteries.
e. Call us for tech support: 800-876-1172 or 916-638-3429 (many problems can be solved over the phone). Fax: [phone] or Email: [e-mail].

f. In the event that the equipment needs to be returned to the factory for any reason, please call to obtain a RMA # (Return Material Authorization). Do not return items without a RMA # displayed on the outside of the package.

Clean and decontaminate the WQ730 when necessary.

Include a written statement describing the problems.

Send the package with shipping prepaid to Global Water's factory address. Insure the shipment, as the warranty does not cover damage incurred during transit.

g. When calling for tech support, please have as much of the following information as possible;

1. Model #.
2. Unit serial number.
3. P.O.# the equipment was purchased on.
4. Global Water's sales number or the invoice number.
5. Repair instructions and/or specific problems relating to the product.

Global Water

800-876-1172 • globalw.com

IV. Warranty

a. Global Water Instrumentation, Inc. warrants that its products are free from defects in material and workmanship under normal use and service for a period of one year from date of shipment from factory. Global Water's obligations under this warranty are limited to, at Global Water's option: (I) replacing or (II) repairing; any products determined to be defective. In no case shall Global Water's liability exceed the products original purchase price. This warranty does not apply to any equipment that has been repaired or altered, except by Global Water Instrumentation, Inc., or which has been subject to misuse, negligence or accident.

b. The warranty begins on the date of the product's invoice.

Global Water

800-876-1172 • globalw.com

V. Appendix A: Turbidity Sensor Calibration

Note: The following steps show how to calibrate the WQ730 Turbidity Sensor using suspended polymer turbidity standards only.

General

a. The Turbidity Sensor is measuring turbidity in liquids by using a 90 degrees scatter nephelometer where a focused beam is directed into the monitored water. The principle is based on recommendations of the international guideline ISO 7027. Two detectors receive light from a source emitting 880 nm infrared light in a pulsed mode. One detector is placed opposite the source, receiving the transmitted light, and the other detector is placed at an angle of 90 degrees to the incident light beam measuring side-scattered light. The detected light intensity is directly proportional to the turbidity of the water.

b. The following supplies are required:

Stand with rod and clamp Beakers, 500 or 1000 ml 1000 NTU Turbidity Standard 50 NTU Turbidity Standard 0.0 NTU Turbidity Standard Distilled Water Power Supply Current Meter Test leads as necessary

The preferred and recommended turbidity standards are suspended polymer solutions. These are EPA approved, non-toxic, and require no mixing or stirring. Other types of standards such as Formazin can also be used, but these require thorough mixing and must be used with low speed stirring plates during the calibration process.

All the necessary turbidity standard solutions are available from Global Water, contact the sales department for more information. See Appendix B.

Global Water

800-876-1172 • globalw.com

Preparation:

a. Set up a test stand with a rod and clamp to hold the sensor. Beakers will be placed underneath the clamp so the sensor can be inserted into the liquid.
b. The sensor must have the stainless steel section of the body in contact with the test solution. Install the sensor so that the end of the sensor is at least 3 inches from the bottom. If the sensor is too close to the bottom, infrared light may be reflected from the glass and effect the measurements.
c. The lenses must be gently cleaned with a cotton swab and isopropyl alcohol before each calibration step.
d. Fill a large beaker with distilled water. This will be used to rinse solution from the sensor in between steps.
e. Fill three more beakers with 0.0 NTU Standard, 50 NTU Standard and 1000 NTU Standard. These beakers must be at least 500 ml in size or the end of the sensor will be too close to the bottom for accurate calibration. This generally requires solution volumes of at least 500ml.
f. The calibration process should not be done in bright light if possible. While not generally required, the extra step of covering the outside of the beakers with a non-transparent material may help to prevent stray light from the outside affecting the readings.

Note: The sensor is factory calibrated and will provide output currents of 20mA at the maximum turbidity values; however, some small drift in this output current can occur over time. These adjustments are done internally, access to these settings are not available to the user. The sensors should never be disassembled. The following process describes how to re-check these output currents. A full recalibration can only be done by returning the sensor to Global Water.

Global Water

800-876-1172 • globalw.com

Checking Calibration

Step 1) Connect the sensor to the power supply and current meter in the following way. Attach the black wire to the ground terminal of the power supply. Attach the white wire to the positive current input of the meter. Connect the ground terminal of the power supply to the ground input of the current meter. Check that the power supply is set between 10 and 30 volts DC. Attach the red wire to the positive terminal of the power supply. Warning: Always hook up the red wire last or the sensor may be damaged.

Step 2) Place the turbidity sensor in the distilled water beaker, rinse and dry. Clean the lenses with alcohol.

Step 3) Place the sensor in the clamp above the 0.0 NTU standard. Turn on the power supply and the current meter. Let the sensor stabilize for several seconds before taking any measurements. If necessary, use a lint free cotton swab bent at 90^ to remove any air bubbles from underneath the detector window. Air bubbles will cause large errors in the current output, especially at low turbidity values.

Step 3) Record the output current of the sensor, Zero (1000) = _____. Disconnect the white wire and connect the green wire to the positive input of the current meter. Let the sensor stabilize. Record the output current of the sensor, Zero (50) = _____.

Step 4) Remove the sensor and rinse in distilled water. Dry the sensor and clean the lenses with alcohol.

Step 5) Place the sensor in the clamp above the 50 NTU solution. If necessary, use a lint free cotton swab bent at 90^ to remove any air bubbles from underneath the detector window.

Step 6) Record the output current of the sensor, 50NTU = ____.

Global Water

800-876-1172 • globalw.com

Step 7) Remove the sensor and rinse in distilled water. Dry the sensor and clean the lenses with alcohol.

Step 8) Disconnect the green wire and connect the white wire to the positive input of the current meter.

Step 9) Place the sensor in the clamp above the 1000 NTU solution. If necessary, use a lint free cotton swab bent at 90^ to remove any air bubbles from underneath the detector window.

Step 10) Record the output current of the sensor, 1000NTU = ____.

Step 11) Remove the sensor and rinse in distilled water. Dry the sensor.

VI. Appendix B: Turbidity Standard Solutions

The following turbidity standards are available from Global Water, contact the Sales Department or Technical Support for more information.

These are EPA approved primary standards that are safe, non-toxic and disposable. They are easy-to-use with no dilution or re-suspension needed. Their inherent stability means they do not settle from suspension and require no stirring. The convenient submicron polymer suspensions are non-toxic primary calibration standards approved by the US EPA for drinking water analysis for turbidity, and preferred by the U. S. Geological Survey for turbidity and sediment transport analysis.

Part Number Description

02-003	0.0 NTU Turbidity Standard
02-004	50	NTU	Turbidity	Standard
02-005	100	NTU	Turbidity	Standard
02-006	1000	NTU	Turbidity	Standard

Global Water

800-876-1172 • globalw.com

Appendix C: Sensor Measurement Diagram

Global Water

800-876-1172 • globalw.com

Declaration of CE Conformity

Global Water Instrumentation, Inc.

11390 Amalgam Way

Gold River, CA 95670 USA

FAX: [phone]

Phone: [phone]

declares that the Product:

Product Name: Turbidity Sensor and Turbidity Meter

Model Number: WQ730, WQ770

conforms to the following European Council directives:

Low Voltage Directives: 2006/95/EC; Requirements covering all health and safety risks of electrical equipment operating within certain voltage ranges.

According to the following standards:

EN61010-1: 2001

Electro-Magnetic Directives: 2004/108/EC; Requirements to prevent electrical and electronic equipment from generating or being affected by electromagnetic disturbances.

According to the following standard:

EN 61326-1: 2006

Batteries Directive: 2006/66/EC ; Requirements regarding the

proper handling and disposal of batteries and accumulators.

Global Water hereby certifies that the product stated above conforms to all directives and standards required for it to bear the CE mark.

Dale Daniel

Engineering Manager

Global Water Instrumentation, Inc.