Xylem WS750 User Manual

Global Water

800-876-1172 • globalw.com

Global Water

Instrumentation, Inc.

151 Graham Road

P. O. Box 9010

College Station, TX 77842-9010

T: 800-876-1172

Int’l: [phone], F: [phone]

E-mail : [e-mail]

WS750 Sampler

01-457
Publication N umber 38560512

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Global Water

800-876-1172 • globalw.com

Table of Contents

I. WS750 Checklist • • • • • Page 3
II. Inspection • • • • • • 3
III. Description • • • • • • • 4
IV. Installing the Water Sampler • • • • 5
V. Installing the Pickup Hose • • • • • 5
VI. The Control Panel • • • • • • 6
VII. Composite Sampling • • • • • 8
VIII. Discrete Sampling • • • • • • 8
IX. Mixed Sampling • • • • • • 9
X. External Trigger mode • • • • • 9
XI. Specifications • • • • • • 11
XII. Maintenance • • • • • • 12
XIII. Troubleshooting • • • • • • 13
XIV. Warranty • • • • • • • 14
XV. Appendix A: Sample Size vs. Head Height • • • 15
XVI. Appendix B: Battery Li fe • • • • 16
XVII. Appendix C: Input and Output Connection • • • 16
XVIII. Appendix D: Accessories • • • • • 17

XIX. CE Certificatio n • • • • • • 18

* Copyright  Global Water Instrumentation, Inc. 2012

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Global Water

800-876-1172 • globalw.com

Congratulations on your purchase of the Global Water WS750
Water Sampler. This instrument has been quality tested and approved for
accurate and reliable operation. We are confident that you will find the
WS750 to be a valuable asset for your applications. Should you require
assistance, our technical st aff will be happy to help.

I. WS750 Checklist

a. WS750 Water Sampler
b. 12V Battery (Inside Enclosure)
c. Bat tery Cable
d. Battery Charger
e. Two Shorting Plugs
f. WS750 Manual

II. Inspection

The WS750 unit was carefully inspected and certified by Global Water’s Quality Assurance Team before shipping. If any damage has occurred during shipping, please notify Global Water Ins trum entation, Inc. and file a claim with the carrier involved.

Use the checklist to ensure that ever y thing needed to operate the WS750 was
received.

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III. Description

The Global Water WS750 Sampler is designed s pec ifically to meet a wide variety
of sampling requirements including industrial discharge, process contr ol, wat er
and wastewater treatment plants, sewers, rivers and streams.

The 750 Sampler can take two individual “time weight ed” composite samples, or
the sampler can be set to take full-bottle disc r ete or “G r ab” samples . Each pump
has its own sample bottle and control for s ett ing the size of individual samples.
This allows each pump to be set as either a composite or dis c r ete sampler
independently of the other or, in the case of two composite samplers, have
different size settings for each pump.

A delay timer can be set to start sampling after a preset time. This allows
multiple samplers to be deployed in the field and have them turn on at the same
time. The delay can also be used to hold off sampling to let the water source
flush out debris or other contaminants .

After each sample, the pumps will reverse for 15 seconds. This c lear s any debris
from the strainer at the end of the pickup hose and also empties water from the
hose so the next sample is not contaminat ed by the pr ev ious one.

Inputs are provided for triggering the sampler based on water level, a rain gauge
sensor or signals from an external process c ontroller or other monitoring device.
Individual outputs are also available f or m onitoring when each of the pumps has
taken a sample, using a data logger or similar recording dev ic e.

The WS750 Sampler is easily set up near industr ial dis c har ges or s treams. It
can also be suspended in a manhole for sewer flow sampling.
The Sampler consists of a rugged, rainproof and lockable carrying enclosure.
The enclosure houses two peristalt ic s ampling pumps, two sample bottles, a
control panel, and a rechargeable batt er y . A battery charger and sample pickup
hoses are also provided.

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Global Water

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IV. Installing the Water Sampler

a. The sampler should be placed upright (it will no t work if placed on its back or

side).

b. Open the sampler and remove the battery charger from the unit. Store the

charger for later use.

c. To s ec ur e the sample bottles:

1. Screw the bottle cap/float swit c h onto the sample bottle

2. Place the bottles into the sampler enclosure

3. Insert the end of the peristaltic pum p’s hose in the hole at the top of the
bottle cap

4. Plug the float switch lead into the jack on t he front of the control panel

d. The sampling unit can be secured from vandalis m and s trong winds by one of

the following methods:

1. Mount unit on post and lock closed

2. Lock closed and chain handles to a solid str uc ture ( s uc h as a tree, post, or
building)

3. Enclose and lock unit in a steel electrical box

e. Avoid drilling holes in the enclosure if poss ible. If holes must be drilled in the

enclosure avoid drilling through t he c ontrol panel enclosure. Any holes drilled
through the enclosure must be sealed with s ome t y pe of silic one glue to
prevent water from entering the case and causing equipm ent failure.

f. The unit is water resistant, not water proof. The unit must be located w ell

above the expected water level to cont inue to provide reliable service.

V. Installing the Pickup Hose

The pickup hose should be installed in a wastewater discharge channel or stream. The
pickup strainer should be submerged under w ater and should be situated to avoid
contact with the channel bottom.

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VI. The Control Panel

1. Pump One.

2. Pump Two.

3. Start Delay: This setting delays sampling by a preset amount of time. If
no delay is desired, set the control to zero. Only the first sam ple taken by
each pump is delayed, except as described lat er in the section titled
“External Trigger Mode”.

4. Sample Interval: Sets the time interval between composite samples. The
“External Trigger” position is res er v ed for using the Trigger and Rain
Sensor inputs to initiate sampling as described later in the section titled
“External Trigger Mode”.

5. Pump 1 Sample Size: Sets the siz e for a single com pos ite sample with
pump one. The sample size settings are approximat e and apply to a head
height of four feet. The switch position mark ed “Full ” causes the pump to
work as a discrete sampler, filling the bot tle full in one sample. Note: In
the “Full” position, the sampler will shut off the pump after one hour, even
if the bottle is not full.

6. Pump 2 Sample Size: Sets the sample siz e for pump two and works the
same as Pump 1 Sample Size described above.

7. Trigger In: These inputs work in “Ex ternal Trigger” mode only, when
selected by the Sample Interval cont r ol. A signal from an external device
will cause a single sample to be taken by the corresponding pump
according to its Size control. The Ext er nal Trigger m ode is des c r ibed in

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