OS-250
Overflow/Spill Sensor
User’s Manual
Catalog No.
78-0500
Publication 5604-001-REV-A
WEEE/RoHS Compliance Statement
EU Directives WEEE and RoHS
To Our Valued Customers:
We are committed to being a good corporate citizen. As part of that commitment,
we strive to maintain an environmentally conscious manufacturing operation. The
European Union (EU) has enacted two Directives, the first on product recycling
(Waste Electrical and Electronic Equipment, WEEE) and the second limiting the use
of certain substances (Restriction on the use of Hazardous Substances, RoHS).
Over time, these Directives will be implemented in the national laws of each EU
Member State.
Once the final national regulations have been put into place, recycling will be offered
for our products which are within the scope of the WEEE Directive. Products falling
under the scope of the WEEE Directive available for sale after August 13, 2005 will
be identified with a “wheelie bin” symbol.
Two Categories of products covered by the WEEE Directive are currently exempt
from the RoHS Directive – Category 8, medical devices (with the exception of
implanted or infected products) and Category 9, monitoring and control instruments.
Most of our products fall into either Category 8 or 9 and are currently exempt from
the RoHS Directive. We will continue to monitor the application of the RoHS
Directive to its products and will comply with any changes as they apply.
• Do Not Dispose Product with Municipal Waste
• Special Collection/Disposal Required
KDS OS-250 Overflow/Spill Sensor
Contents
Introduction ............................................................................................................................2
Setup........................................................................................................................................3
Components ..............................................................................................................3
Assembly ..................................................................................................................4
Operation................................................................................................................................5
Mat Sensitivity ..........................................................................................................5
Effects of Humidity ....................................................................................................6
Resetting the System ................................................................................................6
Appendix ................................................................................................................................7
Specifications ............................................................................................................7
Warranty & Service..................................................................................................7
Replacement Parts ....................................................................................................7
Warranty Information ............................................................................................................8
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KDS OS-250 Overflow/Spill Sensor
Introduction
The OS-250 Overflow/Spill Sensor from KD Scientific provides a simple and effective
method for detecting leaks and spills around sensitive equipment (such as a microscope). The
integrated switched power controller can be used to rapidly turn off all pump and perfusion
systems in the event of a spill. When assembled, the OS-250 can respond to as few a 3
drops of liquid.
FEATURES INCLUDE:
• Cut-able moisture sensitive mats
• Audible and visual alarms
• 8 amp switched power supply
• Rapid response to liquid exposure
• Quiet operation
THIS EQUIPMENT IS NOT DESIGNED NOR INTENDED
FOR USE ON HUMAN SUBJECTS
2
KDS OS-250 Overflow/Spill Sensor
Setup
COMPONENTS
The OS-250 System is comprised of
moisture sensitive mats (4), the OS-250
controller, a sensor cable with mat-clip,
and a line cord for connecting the
switched power output of the OS-250
controller to a powered device such as a
perfusion system. These components are
shown below.
Mats
The moisture sensitive mats represent the heart of this system. Mats
are made from a multi-layer, non-woven, carbon impregnated
material and can be cut to any size or shape. They are resistant to
most organic solvents. They can also be reused following exposure to salt solutions.
OS-250 Controller
The OS-250 controller provides the system’s functionality. The front panel houses the input BNC for the sensor cable,
an alarm LED, an internal alarm speaker and the power switch. The instrument
rear panel houses an outlet for the
switched power cable, a connection
port for the instrument line cord and a
fuse assembly.
Sensor Cable
The sensor cable connects the moisture sensitive mat to the controller. The mat-clip can be attached anywhere on the mat to provide full functionality.
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KDS OS-250 Overflow/Spill Sensor
Setup (Cont’d)
ASSEMBLY
• Begin by cutting a mat to any size and
shape necessary for your application and
placing it into position.
•
Place the controller in a suitable location
and attach the sensor cable to the OS250. Clip the mat-clip anywhere on the
moisture sensitive mat.
•
The OS-250 is designed to be used as a
switchable power source for an external
device such as a perfusion system or
pump. The OS-250 can only provide this
support for devices using standard IEC
type line cords. Use of this feature is not
required for normal operation.
Begin by removing the line cord from the
device that the OS-250 will be powering.
Using the supplied male/female IEC line
cord, make a connection from your device to the rear of the OS-250.
HINT: Connect the male/female IEC line cord to your device before making a connection to the OS-250. This will help sort out the separate plugs on the back of the
OS-250.
•
Using the standard IEC line cord (supplied), plug the OS-250 into a wall outlet
and turn the power on. The unit is ready to use.
OS-250
External Device
Sensor
Cable
Male/Femal IEC
Line Cord
4
Standard IEC Line
Cord with Wall Plug
KDS OS-250 Overflow/Spill Sensor
Operation
Operation of the OS-250 is a simple matter. With the unit powered, the presence of 1-3
drops of conducting solution on the mat will initiate an alarm condition. The red LED will
flash, the controller will beep, and power to the switched power outlet on the controller rear
panel will be shut off. The unit can be reset by either allowing the spill to dry or by replacing
the soiled mat.
MAT SENSITIVITY
Moisture sensitive mats are designed to detect the presence of aqueous solutions. This
includes pure deionized and nanopure (18.2 MW/cm) waters. Mats have also been shown
to detect a limited number of pure organic solvents. Results of liquid drop tests are shown in
the table below.
Drop Resistances for Various Compounds
Mats are capable of detecting the presence of some, but not all, pure organic
solvents. Resistance values below 430 kW will trigger an alarm condition.
Addition of solutes can alter these results. Pure solvents capable of initiating an
alarm condition are shown in red.
Liquid
1 Drop
3 Drops
nanopure H2O
200 MW
82 kW
Normal saline
18 MW
6 kW
ETOH
190 MW
19 kW
MeOH
78 kW
31 kW
acetone
245 kW
136 kW
hexane
240 MW
102 MW
chloroform
210 MW
37 MW
decane
330 MW
260 MW
DMSO
420 MW
290 MW
NOTE: We advise independently testing the performance of all solutions to
which the mats will be exposed. (Use a small 1” test clipping from a spare mat.)
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KDS OS-250 Overflow/Spill Sensor
Operation (Cont’d)
EFFECTS OF HUMIDITY
Extremes in the relative humidity of the local environment can have a dramatic effect on the
performance of the moisture sensitive mats. This is not unreasonable since the mat is
designed to detect the presence of H2O. In general, we find the mats perform well when the
relative humidity is between 10 and 75%.
Humidity conditions below 10% can require as much as 50% more solution to spill onto the
mat before an alarm condition is triggered. In addition, the spill rate can alter the sensitivity
of the mat as evaporative losses can keep mat wetting to below the trigger level.
Humidity conditions above 75% can adversely affect the performance of the mat since this
humidity level can trigger an alarm condition in the absence of a spill.
RESETTING THE SYSTEM
The OS-250 will signal an alarm whenever the mat resistance (from one side of the mat to
the other) drops below 430 kW. The alarm will continue to sound until the mat resistance
increases to 760 kW. This hysteresis allows the mat to respond appropriately under borderline conditions.
When an alarm condition has been met, the system can be reset by allowing the mat to dry
or by replacing the mat entirely. A heavily wetted mat, or a mat wet by a slowly evaporating
liquid can take as much as 24 hours to completely dry. It is more advantageous under these
conditions to simply replace the mat.
Usually, mats can be reused after drying. However, a heavily salted or soiled mat may need
rinsing before reuse. Simply soak the mat in clean H2O and allow it to completely dry before
use.
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KDS OS-250 Overflow/Spill Sensor
Appendix
Specifications
Power Requirements
90 - 240 VAC, 50/60 Hz, 0.5 VA
Operating Humidity
10 to 75%
Switched Outlet Current
8A
Enclosure Dimensions (H x W x D)
4.6 x 8.2 x 18.0 cm (1.8 x 3.2 x 7.1 in)
Weight
1.4 kg (3.1 lbs)
WARRANTY AND SERVICE
Warranty
The OS-250 controller and mat-cable is covered by our Warranty to be free from defects in
materials and workmanship for a period of one year from the date of shipment. If a failure
occurs within this period, we will either repair or replace the faulty component(s). This warranty
does not cover failure or damage caused by physical abuse.
In the event that repairs are necessary, shipping charges to the factory are the customer's
responsibility. Return charges will be paid by KD Scientific.
Service
We recommend that all questions regarding service be referred to our Technical Support
Department.
• Normal business hours are 8:30 AM to 5:00 PM (EST), Monday through Friday
• We are located at 84 October Hill Road, Holliston, MA 01746
• We can be reached by phone at 508.429.6809
Our Fax Number is 508.893.0160
• Email us at info@kdscientific.com or through the contact section of our
website at: www.kdscientific.com
REPLACEMENT PARTS
Catalog Number
Model Number
Product
78-0501
MAT-2
Moisture Sensitive Mats with
Sensor Cable, pkg. of 4
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KDS OS-250 Overflow/Spill Sensor
Limited Warranty
KD Scientific Inc. warrants to the first consumer purchaser, for a period of one year from the
date of purchase that this unit, when shipped in its original container, will be free from
defective workmanship and materials and agree that it will, at its option, either repair or
replace the defective unit.
This warranty does not extend to misuse, neglect or abuse, normal wear and tear, accident,
modification or unauthorised repair.
KD Scientific will not be liable or in any way responsible for any incidental or
consequential economic or property damage. Some States do not allow the exclusion
of incidental or consequential damages, so the above exclusion may not apply to you.
There are no implied warranties of merchantability, or fitness for a particular use, or
of any other nature. Some atates do not allow this limitation on implied warranty, so the
above limitation may not apply to you.
If a defect arises within the warranty period contact KD Scientific Inc. (see address below).
The customer is responsible for shipping charges and must first obtain a Return Material
Authorization number (RMA) before the unit will be accepted. If a replacement unit is issued
it is covered only for the remainder of the original warranty period dating from the purchase
of the original device.
This warranty gives you specific legal rights. You may also have other rights which vary from
state to state.
Note: This pump device is not registered with the FDA and is not for clinical use on
human beings.
The OS-250 is manufactured by:
KD Scientific Inc.
84 October Hill Road
Holliston, MA 01746
Phone: 508.429.6809
Fax: 508.893.0160
E-mail: info@kdscientific.com
Web: www.kdscientific.com
Copyright © 2005 by KD Scientific Inc. All rights reserved. Printed in USA
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