Global Water
800-876-1172 • globalw.com
Global Water
Instrumentation, Inc.
11390 Amalgam Way
Gold River, CA 95670
T: 800-876-1172
Int’l: (916) 638-3429, F: (916) 638-3270
globalw.com
WS755 Water Sampler
01-957 11/30/2009
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Global Water
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Table of Contents
I. WS755 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 • • • • • • 12
XIV. Warranty
XV. Appendix A: Sample Size vs. Head Height • • • 15
XVI. Appendix B: Battery Life • • • • 16
XVII. Appendix C: Input and Output Connections • • • 16
XVIII. Appendix D: Accessories • • • • • 17
XIX. CE Certification • • • • • • 18
* Copyright © Global Water Instr umentation, Inc. 2009
• • • • • • • 14
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Global Water
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Congratulations on your purchase of the Global Water WS755
Water Sampler. This instrument has been quality tested and approved for
accurate and reliable operation. We are confident that you will find the
WS755 to be a valuable asset for your applications. Should you require
assistance, our technical staff will be happy to help.
I. WS755 Checklist
1. WS755 Water Sampler with Transport Case
2. Two 20-Mesh Pickup Strainers w/ 15’ of Hose
3. 12V Battery in Battery Enclosure
4. 3-Stage Charge Controller
5. 18 Volt Regulated Battery Charger
6. Battery Cable
7. Two Water Sensor Shorting Plugs
8. Two Quick-Disconnect Fitting Caps and Plugs
9. WS755 Manual
II. Inspection
The WS755 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 WS755 Water
Sampler was received.
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III. Description
The Global Water WS755 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 sampler consists of a rugged, rainproof and lockable wheeled transport case
with a comfort grip handle on top and retractable handle on the back. The
enclosure houses a control panel with two peristaltic sampling pumps, two
sample bottles, two pickup hoses and strainers with quick-disconnect fittings, a
rechargeable battery with 3-stage charge controller in a self contained battery
box, and a energy efficient regulated battery charger.
The WS755 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.
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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. Remove the pickup hoses and connect to the sampler using the quick-
disconnect fittings on the side of the enclosure. Place the protective caps
over the protective quick-disconnect plugs and save for future use.
d. 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
e. 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
f. 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 sealant to prevent
water from entering the case and causing equipment failure.
g. 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
Remove the pickup hoses from the enclosure and connect to the sampler using the
quick-disconnect fittings. Place the protective caps over the protective plugs and save
for future use. When storing the hoses inside the enclosure, replace the protective caps
and plugs to keep the fittings clean of dirt and contamination. The pickup hoses should
be installed in a wastewater discharge channel or stream. The pickup strainers should
be submerged under water and should be situated to avoid contact with the channel
bottom.
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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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more detail later in the section titled “External Trigger Mode”. Refer to the
Specifications section for details about the input pulse requirements.
8. Pulse Out:
These outputs send a pulse to an optional recording or
monitoring device each time the corresponding pump starts, allowing the
time of the sample event to be recorded. Refer to the Specifications
section for details about the output pulse.
9. Status:
This red LED indicates the status of the sampler. While the
sampler is waiting to be triggered, the light remains off. Once triggered,
the LED will blink once every two seconds while the Delay or Interval
timers are running and while the pumps are operating. The LED remains
lit constantly when both sample bottles are full or if the switches are not
plugged in.
10. Power:
This turns the power to the sampler on and off. Turning the
switch off for one second resets all functions and timers.
11. Battery:
12. Water Sensor:
Connect the battery here using the supplied battery cable.
When an optional water sensor is plugged into this jack,
sampling will not begin until the presence of water is detected (the Rain
Sensor must also detect water). If this sensor input is not being used,
plug one of the two shorting plugs supplied with the sampler into this jack.
This input has no affect when triggering the sampler with the Trigger
Inputs in External Trigger mode.
13. Rain Sensor:
When an optional water sensor is plugged into this jack,
sampling will not begin until the presence of water is detected, usually in a
rain gauge (the Water Sensor must also detect water). If this sensor input
is not being used, plug one of the two shorting plugs supplied with the
sampler into this jack. This input has no affect when triggering the
sampler with the Trigger Inputs in External Trigger mode. This input can
also be used to take individual composite samples and is described in
detail later in the section titled “External Trigger Mode”.
14. Bottle Switches:
The sample bottle float switches plug into the control
panel here. For sampling to occur, a float switch must be plugged in and
the bottle must not be full. If the Status LED remains lit all the time, check
these connections.
15. Test Pump:
Pressing one of these buttons tests the operation of the
corresponding pump. These buttons will test the pumps operation
regardless of whether a bottle switch is plugged in or not. The pump runs
forward for as long as the button is held down, then reverses for an equal
amount of time, or 15 seconds, which ever is less.
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VI. Composite Sampling
A composite sample is a series of smaller samples put into the same bottle, thus showing
an “average” sample over time. Set the Interval control to the desired time between
samples (do not select the External Trigger position). Set the Size control for the
corresponding pump to the desired sample size. Note that the sample size settings are
approximate and apply to a head height of four feet. For heights other than four feet, refer
to the chart inside the front of the sampler. Each pump can have different size settings but
will share the same Sample Interval setting.
The sampler starts timing when both of the optional Rain and Water Sensors detect
moisture. If you do not have the optional water sensors or do not need them for your
application, defeat them by plugging one of the two shorting plugs supplied with the sampler
into their jack. If both inputs are defeated, the sampler starts up triggered when the power
switch is turned on. The Status LED starts blinking every 2 seconds once the sampler is
triggered.
The Start Delay timer begins running when the sampler is triggered by the Rain and Water
Sensors and the first sample is taken when the timer expires. If the Delay control is set to
zero, sampling begins immediately. The delay timer only applies to the first sample taken
by each pump. At the end of each sample, the pumps reverse for 15 seconds.
Sampling continues as Trigger-Delay-Sample-Reverse-Interval-Sample-Reverse-IntervalSample-Reverse … until the sample bottles are full. For each pump, the same amount of
Interval time is placed between samples, even if the size settings are different. When both
bottles are full, the Status LED remains lit constantly.
VII. Discrete Sampling
A discrete sample is a single sample put into the same bottle, thus being a sample at one
point in time. Set the Size control for the corresponding pump to “Full”. Once started, the
pump will continue to run until the sample bottle if full.
As with composite sampling, the Start Delay timer begins when the sampler is trigger by the
Rain and Water Sensors and the first sample is taken when the timer expires. If the Delay
control is set to zero, sampling begins immediately. The Status LED blinks every 2 seconds
while the delay timer or the pumps are running and remains lit constantly once both of the
sample bottles have been filled. At the end of sampling, the pumps reverse for 15 seconds.
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VIII. Mixed Sampling, Composite and Discrete Sampler
The WS755 Sampler can be configured as both a composite and discrete sampler at the
same time since each pump has a separate Size control. Set one pump’s size setting to the
desired composite sample size and the other to “Full”.
Again, the Start Delay timer begins when the sampler is trigger by the Rain and Water
Sensors and the first sample is taken when the timer expires. If the Delay control is set to
zero, sampling begins immediately. The Status LED blinks every 2 seconds while the delay
timer and the pumps are running and remains lit constantly once both of the sample bottles
have been filled. At the end of each sample, the pumps reverse for 15 seconds.
X. External Trigger Mode
When the Sample Interval control is set to the “External Trigger” position, the sampler can
be triggered externally by inputs from either the Trigger In jacks or the Rain Sensor input.
This mode is useful in applications where sampling occurs based on readings from a
process controller, SCADA system, flow monitor, auto-dumping rain gauge or other remote
monitoring devices.
Using the Rain Sensor as a trigger source:
This mode is normally used with an auto-dumping rain gauge that empties itself every 24
hours. Set the Sample Interval control to External Trigger. Set each pumps Size control
based on desired composite sample size or set to Full for a discrete sample.
The sampler will be triggered when both the Rain and Water Sensors detect moisture. If the
Water Sensor is not needed, use one of the shorting plugs supplied with the sampler to
defeat it by plugging it into the Water Sensor input jack. Place the Rain Sensor at the
desired height in the rain gauge. When the Rain Sensor detects moisture, the sampler will
start.
Once triggered by the Rain Sensor, the Start Delay timer begins running and the Status
LED begins blinking every 2 seconds. When the timer expires, the pumps take a sample
based on their individual Size settings. When the samples are complete, the pumps reverse
for 15 seconds, then stop. The sampler cannot be re-triggered until the rain gauge empties
itself and the Rain Sensor goes dry. The next time the sensor detects moisture, the Start
Delay timer will start over again and another sample will be taken when it expires.
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If a pump’s Size control is set to take a full-bottle discrete sample, further triggers will have
no affect on that pump. If a pump is set to take composite samples, each one will represent
the conditions at the time of that “qualified rain event”. This process will continue until both
the sample bottles are full and the Status LED remains lit all the time.
Using the Trigger Inputs as a source:
These inputs are generally used for connecting to a flow monitor, processor controller, or
other external monitoring device.
When using the Trigger In input jacks, leave the Rain Sensor input jack disconnected. Each
of the two Trigger Inputs control the corresponding pump separately from the other.
Upon being triggered by one of the Trigger Inputs, the Start Delay timer begins running.
When the delay timer has expired, the corresponding pump takes a sample based on its
Size setting. Holding the Trigger Input active past the end of the sample will cause the
pump to continue until the Trigger Input is released. When the sample is complete, the
pump reverses, and then stops.
Flow Proportional Sampling
a. To set the WS755 up to take flow proportional samples, a flow monitor must
be attached to the control panel. In this configuration, the sampler is
designed to take a sample every time a specific amount of flow has passed
through the flow monitor.
b. The flow monitor must provide a momentary switch closure (250ms or longer)
or a pulse of 4-30VDC, whenever a sample is to be taken. The output of the
flow monitor must be wired to a 2-wire RCA jack as shown in Appendix C.
The phone plug is then inserted into the Trigger In jack on the control panel.
c. Set the Sample Interval knob to External Trigger mode and the Sample Size
knob to the desired sample size. The sample will be taken, flow
proportionally, as directed by the flow meter.
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XI. Specifications
Operating Temperature: 0° to +70°C
Dimensions 22”H X 18"W X 10"D
Weight: 30lb (Shipping Weight 32lbs)
Materials:
Enclosure: Expanded UV protected PVC
Bottles: Two 1 gallon Polyethylene
Pickup Hoses: 15' nylon reinforced 1/4" ID polyethylene
6-Mesh strainers available as options.
Pump Tubing: Neoprene 1/4" ID, 7/16” OD
Sample Pumps:
Flow Rate: 1000 ml per minute at 4 ft. head
Type: Peristaltic
Maximum Lift: ~20 feet
Battery: Rechargeable 5 AH Gel Cell
Battery Life: One Pump running: ~1 hour
Start Delay: 16 time settings from 0 to 12 hours
Composite Interval: 15 time settings from 5 min. to 12 hours
Sample Size: 15 composite sample sizes from 50ml to
External Trigger Inputs: 250mS minimum pulse width
Pulse Outputs: 5VDC one-second pulse
1000ohm output impedance
Bottle Switch Inputs: Switch closure Input
Floating read switch in bottle
Rain and Water Sensors: Optional moisture sensors or switch
Internal Fuse: 10A Slow-Blow
Charger 18VDC Universal Switching Supply,
2.1mm Connector, Center Positive
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flexible tubing with 20-Mesh intake
strainers and quick-disconnect fittings.
Two Pumps running: ~ ½ hour
Standby: 3 months while retaining power
to run both pumps to capacity
plus an External Trigger mode setting
2 liters plus a Full Bottle discrete setting
(Approximate sizes at 4 foot head)
Switch closure or 4-30VDC
closure inputs
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XII. Maintenance
Sampler
The Global Water WS755 Water Sampler requires minimal maintenance. The
sampler enclosure is rainproof and rugged. Avoid exposure to extremely rough
usage. Routinely wipe the carrying case and control panel face, rinse the pickup
hose and debris strainer, and wash the sample bottles with mild soap and warm
water. Additional plastic and glass sample bottles, neoprene tubing for the
sampler pump, bottle caps/float switches, removable debris strainers, and pickup
hose can be purchased from Global Water (see Appendix D section).
Battery
If the pumps run slowly, this is an indication that the battery requires recharging.
Global Water recommends fully recharging batteries approximately once per
month. In addition, the battery should be recharged before any extended use.
NOTE: The battery life will be maximized if recharged before it drains below 11
volts.
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To recharge the battery, plug the included charger
into the charging jack on the outside on the sampler
enclosure. The WS755 has a 3-Stage charge
controller installed inside the battery enclosure that
will prevent over-charging. To prevent damage to the
battery and controller, use only the supplied charger.
Additional batteries and battery chargers are available
from Global Water (see Appendix D).
XIII. Troubleshooting
a. Check that the battery is firmly connected to the control panel and confirm
that it is fully charged.
b. Press the Pump Test buttons on the front panel. The test buttons should
always run the pumps, regardless of the state of any of the inputs.
c. Turn the power switch off for 1-2 seconds then back on to reset the sampler.
d. Check the Status LED on the front panel.
i. The LED is off: If the w ater sensors are being used, check the Rain
and Water Sensor inputs. Sensors must be in contact with moisture
and unused inputs must have one of the shorting plugs supplied with
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the sampler plugged into the jack. If the Trigger Inputs are being used,
confirm that External Trigger mode is selected on the Interval control.
Check the pulses coming from the triggering device and confirm they
meet specifications. Test the Trigger Inputs by plugging one of the
shorting plugs supplied with the sampler into the jack.
ii. The LED is blinking: C heck the Start Delay and Interval settings. The
sampler may be waiting for the Delay timer to run out or it may be
timing the interval between composite samples.
iii. The LED is on constantly: Check the bottle switches. The light
remains on when both sample bottles are full or when both float
switches are not plugged in or working properly. Plug one of the
shorting plugs supplied with the sampler into one of the bottle switch
jacks, the light should go out or start blinking.
Other issues
e. Call us for tech support: 800-876-1172 or 916-638-3429 (many problems can
be solved over the phone). Fax: 916-638-3270 or Email:
globalw@globalw.com.
Be prepared to describe the problem being experienced including specific
details of the application and installation and any additional pertinent
information.
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 # on the outside of the package.
Decontaminate the WS705 prior to returning.
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 the following information ready;
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.
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IXV. 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. It is expressly agreed that this
warranty will be in lieu of all warranties of fitness and in lieu of the warranty of
merchantability.
b. The warranty begins on the date of the product’s invoice.
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Appendix A: Sample Size vs. Head Height
Use the following graph to see how sample size changes with head height. The Sample
Size controls on the control panel are calibrated at a height of 4 feet. Increasing the head
height decreases the sample size by a predictable amount. To determine the appropriate
Sample Size setting for a desired volume; find the sample size on the horizontal axis, follow
straight up to the line corresponding to your head height, then look across to the vertical
axis and read the setting for the Size control on the control panel.
Actual Sample Size vs. Sample Size Control for Various Head Heights
2000
1800
1600
1400
1200
1000
800
600
Sample Size Control Setting (ml)
400
200
0
0 250 500 750 1000 1250 1500 1750 2000 2250
14 Feet
2 Feet
Actual Sample Size (ml)
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Appendix B: Battery Life
While battery life depends on several factors such as charge, condition and temperature; it
can generally be assumed that the sampler can deployed in the field for 3 months waiting to
be triggered, while still retaining enough charge to run a single pump for one hour (about 10
gallons) or both pumps for ½ hour (5 gallons). To prevent large current surges which occur
when the pumps first turn on, the WS755 is designed so that only one pump will turn on or
off at a time. A ½ second time delay is inserted between these events, extending the life of
the charge and the life of the battery.
The battery should generally be charged at least once per month and the voltage should not
be allowed to fall below 11 volts. The internal charge controller will prevent the
overcharging of the battery if the charger is left connected all the time.
Appendix C: Input and Output Connections
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Appendix D: Accessories
Part Description Part Number Unit
12V 5Ah Battery 00-010 Each
Battery Charger 01-998 Each
1 Gallon Plastic Sample Bottle 00-418 Each
1 Gallon Plastic Bottle Cap/Float Switch CB0200 Each
Replacement Pickup Hose 00-546 Feet
20-Mesh Pickup Strainer Assembly CA0600 Each
Replacement 20-Mesh Strainer 01-881 Each
Optional 6-Mesh Strainer 01-945 Each
Quick-Disconnect Fitting Plug & Cap CA0850 Each
Tubing Quick-Disconnect Fitting CA0860 Each
Replacement Pump Tubing 00-744 Feet
Rain and Water Sensors CA0400 Each
Auto-Drain Rain Gauge CH0000 Each
Complete Stormwater Kit
CTU000 Each
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Declaration of CE Conformity
Global Water Instrumentation, Inc.
11390 Amalgam Way
Gold River, CA 95670 USA
FAX: 00 1 916 638 3270
Phone: 00 1 916 638 3429
declares that the Products:
Product Name: Wastewater Samplers
Model Number: WS700, WS750, WS705,WS755
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
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.
; Requirements regarding the
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