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
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
Loading...