Global Water WS750 Instruction Manual

Global Water

800-876-1172 • globalw.com

Global Water

Instrumentation, Inc.

11390 Amalgam Way

Gold River, CA 95670

T: 800-876-1172

Int’l: [phone], F: [phone]

globalw.com

WS750 Sampler

01-457 11/30/09

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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
XV. Appendix A: Sample Size vs. Head Height • • • 15
XVI. Appendix B: Battery Life • • • • 16
XVII. Appendix C: Input and Output Connection • • • 16
XVIII. Appendix D: Accessories • • • • • 17

XIX. CE Certification • • • • • • 18

* Copyright © Global Water Instr umentation, Inc. 2006

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Global Water

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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 staff will be happy to help.

I. WS750 Checklist

a. WS750 Water Sampler
b. 12V Battery (Inside Enclosure)
c. Battery 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 Instrumentation, Inc. and file a claim with the carrier
involved.

Use the checklist to ensure that everything needed to operate the WS750 was
received.

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III. Description

The Global Water WS750 Sampler is designed specifically to meet a wide variety
of sampling requirements including industrial discharge, process control, water
and wastewater treatment plants, sewers, rivers and streams.

The 750 Sampler can take two individual “time weighted” composite samples, or
the sampler can be set to take full-bottle discrete or “Grab” samples. Each pump
has its own sample bottle and control for setting the size of individual samples.
This allows each pump to be set as either a composite or discrete 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 clears 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 contaminated by the previous one.

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

The WS750 Sampler is easily set up near industrial discharges or streams. 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 peristaltic sampling pumps, two sample bottles, a
control panel, and a rechargeable battery. A battery charger and sample pickup
hoses are also provided.

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IV. Installing the Water Sampler

a. The sampler should be placed upright (it will not 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 secure the sample bottles:

1. Screw the bottle cap/float switch onto the sample bottle

2. Place the bottles into the sampler enclosure

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

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

d. The sampling unit can be secured from vandalism and strong winds by one of

the following methods:

1. Mount unit on post and lock closed

2. Lock closed and chain handles to a solid structure (such as a tree, post, or
building)

3. Enclose and lock unit in a steel electrical box

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

enclosure avoid drilling through the control panel enclosure. Any holes drilled
through the enclosure must be sealed with some type of silicone glue to
prevent water from entering the case and causing equipment failure.

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

above the expected water level to continue 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 water 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:
no delay is desired, set the control to zero. Only the first sample taken by
each pump is delayed, except as described later in the section titled
“External Trigger Mode”.

4. Sample Interval:
“External Trigger” position is reserved 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:
pump one. The sample size settings are approximate and apply to a head
height of four feet. The switch position marked “Full” causes the pump to
work as a discrete sampler, filling the bottle 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:
same as Pump 1 Sample Size described above.

7. Trigger In:
selected by the Sample Interval control. A signal from an external device
will cause a single sample to be taken by the corresponding pump
according to its Size control. The External Trigger mode is described in

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This setting delays sampling by a preset amount of time. If

Sets the time interval between composite samples. The

Sets the size for a single composite sample with

Sets the sample size for pump two and works the

These inputs work in “External Trigger” mode only, when

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