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chek-mate Flowmeter
Cat. No. 375-07550N
Operating Instructions
863 Valley View Road, Eighty Four, PA 15330 USA • Tel: 724-941-9701 • www.skcinc.com
Inlet
LCD screen
On/off
button
Introduction
Front View
Outlet
Battery
compartment
cover
Battery
Back View
Figure 1. chek-mate Flowmeter
Description
The chek-mate Flowmeter (Figure 1) is designed specifi cally for use with air sample pumps. It has a fl ow measurement range of 0.75 to
5 L/min and a volumetric accuracy of 1% of reading.
Checking Package Contents
See below to verify that you received all items associated with the Cat. No. ordered. If you are missing items, contact SKC
at 800-752-8472 (U.S. only) or 724-941-9701.
If You Ordered Cat. No. Your Package Should Contain
375-07550N Flowmeter with 9-volt alkaline battery and NIST-traceable calibration certifi cate
Required Equipment
; 1/4-inch ID tubing
www.skcinc.com
Form 38058 Rev 1706
Page 1 of 4
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Getting Started
Notes and Cautions
• Allow chek-mate to equilibrate after moving it from one temperature extreme to another before use.
• The chek-mate case is rated IP40, not as waterproof or splashproof, so do not use it where water can enter the case.
• Ensure that fl uids do not enter either the inlet or outlet port.
• Protect the chek-mate from direct exposure to sunlight to prevent the sunlight from heating the case.
• Avoid extended use of the chek-mate in areas with high levels of airborne particulates.
• Failure to follow these guidelines will void the warranty.
Turn On/Off
Press the on/off bu on on the front of the chek-mate to turn it on. See Figure 1.
Read Battery Status on LCD
When the ba ery voltage drops below 8 volts as it nears the end of its life, LOW BATTERY will be displayed in the upper left corner
of the LCD. Replace the ba ery. See Maintenance.
When the battery voltage drops below 7 volts, the LOW BATTERY message displayed on the LCD will fl ash on and off and the chek-mate
will turn off automatically. If the chek-mate is turned on again with the battery still in this condition, the LCD will display bAtt LO ten
times and then turn off automatically.
Operation
Set/Calibrate Flow Rate
• Allow the chek-mate to equilibrate for at least 10 minutes after moving it from one temperature extreme to another.
• Protect the chek-mate from direct exposure to sunlight to prevent the sunlight from heating the case.
• Ensure that fl uids do not enter either the inlet or outlet.
• Avoid extended use of the chek-mate in areas with high levels of airborne particulates.
1. Turn on the fl owmeter by pressing the on/off bu on on the front. The LCD screen will cycle
through the startup messages, “On” followed by the fl ow meter range “5.0 L,” and will then
indicate the current fl ow rate.
Note: The chek-mate Flowmeter does not zero the fl ow reading at startup, so it is also possible to turn
it on with the sample train already connected and airfl ow passing through the fl owmeter without
aff ecting the accuracy of the fl ow reading.
2. Connect the fl owmeter outlet to the inlet of the calibration train using a length of fl exible
1/4-inch ID tubing, and if required by the sampler, a calibration adapter. See Figure 2.
3. Start the sample pump and observe the LCD on the fl owmeter until it achieves a steady
value. The reading may vary by up to ± 0.005 L/min around the steady value. Note: Run the
pump for a minimum of 5 minutes to stabilize before adjusting the fl ow rate.
4. Adjust the sample pump to give the desired sample fl ow rate.
Figure 2. Calibration Train
5. Disconnect the tubing from the fl owmeter outlet, taking care not to twist the tubing. Turn off the fl owmeter using the on/off bu on.
Automatic Power Off Timer
The chek-mate Flowmeter will remain on indefi nitely provided that a fl ow rate higher than 0.5 L/min is indicated. With a fl ow
rate lower than 0.5 L/min or no airfl ow, the fl owmeter will automatically turn off after 15 minutes to preserve ba ery power.
www.skcinc.com
Form 38058 Rev 1706
Page 2 of 4
Page 3
Maintenance
If the chek-mate is not going to be used for an extended period, remove the battery from the battery compartment. Deep discharge of alkaline
batteries can result in the eventual leakage of battery electrolyte even from quality batteries and can corrode the battery compartment
terminals and potentially the fl owmeter printed circuit board.
Replace the Battery
• SKC recommends using quality alkaline batteries to ensure long battery life and prevent damage due to leaking battery electrolyte. A quality battery
such as the Duracell Industrial model supplied with the chek-mate should provide as many as 30 hours of operation.
• If using a rechargeable battery, it must be 8.4-volt NiMH (see Performance Profi le for specifi cations).
• Failure to follow these guidelines will void the warranty.
When the ba ery voltage drops below 8 volts as it nears the end of its life, LOW BATTERY will be displayed in the upper left corner of
the LCD. Replace the ba ery as follows:
1. Unscrew the two captive screws securing the ba ery compartment cover using a small Phillips head screwdriver and remove the cover.
2. Lift the old ba ery straight up and out of the ba ery compartment.
3. Insert the replacement ba ery into the compartment, ensuring that the terminals are oriented correctly as shown on the label at the
bo om of the compartment.
4. Insert the ba ery compartment cover and secure it with the two captive screws. Do not overtighten the screws.
When the battery voltage drops below 7 volts, the LOW BATTERY message displayed on the LCD will fl ash on and off and the
chek-mate will switch off automatically. If the chek-mate is turned on again with the battery still in this condition, the LCD will display
bAtt LO ten times and then turn off automatically.
Calibrate the chek-mate Flowmeter
Although SKC recommends a minimum calibration interval of one year, users are responsibile for determining the most suitable
interval to meet their quality assurance system requirements; they should also consider the frequency of use and operating
environment.
Calibrate the chek-mate Flowmeter under vacuum.
Because the chek-mate is designed specifi cally for use with air sample pumps, which operate under vacuum, it is factory-
calibrated under vacuum, connecting the vacuum fl ow source alternately to the chek-mate Flowmeter and reference fl owmeter
to ensure its accuracy for this application. If a calibration is to be performed other than as just specifi ed and/or using a positive
pressure fl ow source, contact SKC technical support for advice on calibration methodology.
SKC CAL Service off ers calibration and documentation for the chek-mate and other fl owmeters. The SKC Calibration Laboratory
will calibrate the chek-mate at fl ow rates of 750 ml/min and 1, 2, 4, and 5 L/min. NIST-traceable and ISO/IEC 17025:2005 services
are available. Order SKC CAL Service at www.skcinc.com.
Replacement Parts
Battery, 9-volt alkaline P37500
SKC Limited Warranty and Return Policy
SKC products are subject to the SKC Limited Warranty and Return Policy, which provides SKC’s sole liability and the buyer’s exclusive
remedy. To view the complete SKC Limited Warranty and Return Policy, go to h p://www.skcinc.com/warranty.asp.
www.skcinc.com
Form 38058 Rev 1706
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Appendix
Performance Profi le
Flow Measurement
Range
Airfl ow Display
Resolution
Airfl ow Accuracy ± 1% of reading
Operating Temperature
Range
Operating Atmospheric
Pressure Range
Operating Altitude Sea level to approximately 10,000 ft (3050 m) above sea level
Dimensions 7.1 x 3.3 x 1.3 in (18 x 8.3 x 3.3 cm)
Weight 8.5 oz (242 gm)
Tubing Requires 1/4-in ID tubing
Enclosure IP Rating IP40
Power Supply 9-V alkaline (disposable) PP3/6LR61/1604A or equivalent - should provide 30 hrs of operation; or
Low Battery When battery voltage drops below 8 V, LCD displays LOW BATTERY.
Low Battery Fault When battery voltage drops below 7 V, fl owmeter shuts down.
0.75 to 5.0 L/min volumetric
0.001 L/min
32 to 104 F (0 to 40 C)
20.7 to 32.2 in Hg (700 to 1090 mbar)
8.4-V NiMH (rechargeable) PP3/6HR1/8.4H5 or equivalent
Automatic Power Off
Timer
Certifi cations CE marked
15 min
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Form 38058 Rev 1706
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