SKC chek-mate 375 series, chek-mate 375-0550, chek-mate 375-0550N, chek-mate 375-00205N, chek-mate 375-00205 Operating Instructions Manual
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chek-mate Flowmeter
Cat. No. 375 Series
Operating Instructions
863 Valley View Road, Eighty Four, PA 15330 USA • Tel: 724-941-9701 • www.skcinc.com
Inlet
Low battery
indicator
LCD screen
On/off
button
Introduction
Front View
Outlet
CalChek interface socket
(Cat. Nos. 375-0550N and
375-0550 only)
Battery
Figure 1. chek-mate Flowmeter Overview
Battery
compartment
cover
Back View
Description
The chek-mate® Flowmeter (Figure 1) is designed specifi cally for use with air sample pumps and is available in medium fl ow and
low fl ow models:
• Medium flow chek-mate Flowmeters with CalChek Cat. Nos. 375-0550N and 375-0550 have a flow measurement range of
0.5 to 5 L/min and provides CalChek capability. Volumetric accuracy is 1% of reading for 0.75 to 5 L/min and 2.5% of reading for
0.5 to 0.75 L/min. This model has a CalChek serial interface that enables direct communication with CalChek-ready pumps in the
chek-mate flow range for single-point (Single) and multiple-point (Full) automatic flow calibration.
• Low Flow chek-mate Flowmeters Cat. Nos. 375-00205N and 375-00205 have a flow measurement range of 20 to 500 ml/min.
Volumetric accuracy is 1% of reading for 50 to 500 ml/min and 2.5% of reading for 20 to 50 ml/min.
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
375-0550N Flowmeter with 9-volt alkaline battery and NIST-traceable calibration certifi cate
375-0550 Flowmeter with 9-volt alkaline battery and UKAS-traceable calibration certifi cate
375-00205N Flowmeter with 9-volt alkaline battery and NIST-traceable calibration certifi cate
375-00205 Flowmeter with 9-volt alkaline battery and UKAS-traceable calibration certifi cate
Required Equipment
; 1/4-inch ID tubing
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Form 39013 Rev 1905
Page 1 of 6
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Getting Started
Notes and Cautions
• Allow chek-mate to equilibrate for at least 10 minutes after moving it from one temperature extreme to another before use.
• The chek-mate case is rated IP40, not as waterproof or splashproof; do not use it where water can enter the case.
• Ensure that fl uids do not enter either the inlet or outlet.
• Protect the chek-mate from direct exposure to sunlight to prevent it from heating the case.
• Avoid extended use of the chek-mate in areas with high levels of airborne particulates. If this cannot be avoided, use an external inlet fi lter with high
collection effi ciency (i.e., one that collects the majority of all dust particles) and low back pressure. SKC does not supply this.
• Use only the specifi ed disposable or rechargeable battery types.
• Ensure that discharged batteries are not left in the battery compartment for long periods to prevent damage caused by electrolyte leakage.
• There are no user-serviceable parts in the chek-mate fl owmeter. Opening the chekmate case will void the product warranty and could affect the
instrument calibration. An anti-tamper warning label is fi tted to the case to indicate that the case has been opened.
• Failure to follow these guidelines will void the warranty.
Turn On/Off
Allow the chek-mate to equilibrate for at least 10 minutes in the location where it will be used to ensure that it has stabilized to
ambient temperature.
To turn on the chek-mate, press the on/off bu on on the front. 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 (Figure 1). 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 it 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. See Notes and Cautions.
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 upper limit of the fl owmeter
range (“5.0 L” for the medium fl ow model or “0.5 L” for the low fl ow model), and will
then indicate the current fl ow rate or “_ _ _ _” if there is no airfl ow or the fl ow rate is below
the minimum display value. Note: The minimum display value is dependent on the atmospheric
conditions, but at 68 F (20 C) and 1 atm (1013.25 mbar), the values are 5 ml/min for the low fl ow
chek-mate or 0.3 L/min for the medium fl ow chek-mate. Minimum display values will be higher
when the fl owmeter is used at higher altitudes and temperatures.
Note: The chek-mate 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.
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Figure 2. Calibration Train
Form 39013 Rev 1905
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3. Start the sample pump and observe the LCD on the fl owmeter until it achieves a steady value. The reading may vary around the
steady value by up to ± 0.005 L/min on the medium fl ow model and ± 0.5 ml/min on the low fl ow model. If the fl ow is fl uctuating,
there are two options for determining the average fl ow value:
a. Observe the highest and lowest readings and calculate the average of these two readings or
b. Record ten fl owmeter readings and calculate the average of the readings.
Note: Run the pump for a minimum of 5 minutes to stabilize before adjusting the fl ow rate.
4. Adjust the sample pump to reach the desired sample fl ow rate.
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 will remain on indefi nitely provided that a fl ow rate higher than the minimum display value (see Step 1 above)
is indicated. With a fl ow rate lower than the minimum display value or no airfl ow (“----” indicated on the LCD), the fl owmeter
will automatically turn off after 15 minutes to preserve ba ery power.
Set Up CalChek Calibration (chek-mate Flowmeter Cat. Nos. 375-0550N and 375-0550 Only)
• The CalChek Communication Cable Cat. No. 375-200 is required for automatic fl ow calibration of AirChek TOUCH pumps.
• CalChek Single Calibration requires sampling media in line.
• CalChek Full Calibration automatically calibrates the pump across its entire operating range, and so it is performed without sampling media in line;
instead, Pulsation Dampener Cat. No. 375-100 must be installed between the fl owmeter and pump.
1. Prepare the pump charging cradle and pump per pump operating instructions. Note: Ensure that the appropriate power supply is installed
on the charging cradle and the AirChek TOUCH pump is seated in the charging cradle.
2. Turn on the fl owmeter by pressing the on/off bu on. See Figure 1.
3. Connect the CalChek Communication Cable to the fl owmeter and the pump charging cradle. See below.
a. Install one connector end of cable into CalChek
interface socket on fl owmeter.
b. Insert other connector end of cable into
CalChek port on back of charging cradle
(e-Cradle shown).
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Form 39013 Rev 1905
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Page 4
4. Prepare the calibration train:
a. For Single Calibration, use fl exible 1/4-inch ID tubing
to connect the fl owmeter outlet to the representative
sampling medium inlet and the representative sampling
medium outlet to the pump inlet. Use a calibration
b. For Full Calibration, use two lengths of fl exible 1/4-inch
ID tubing to connect the Pulsation Dampener to the
fl owmeter outlet and to the pump inlet. Do not place
any sampling media in line. See Figure 4.
adapter if required. See Figure 3.
Flowmeter outlet
Cable
375-0550
FLOW CALIBRATOR
FOR AIR SAMPLING PUMPS
0.5 - 5.0 litre/min
S/No18544134
CALIBRATE UNDER VACUUM
MANUFACTURED BY SKC LIMITED UNDER A
SOLE LICENSE FROM GRAHAM BLATCHFORD
www.skcltd.com
Pump inlet
Representative
sampling medium
Cable
Figure 3. CalChek Single Calibration Train
Flowmeter outlet
375-0550
FLOW CALIBRATOR
FOR AIR SAMPLING PUMPS
0.5 - 5.0 litre/min
S/No18544134
CALIBRATE UNDER VACUUM
MANUFACTURED BY SKC LIMITED UNDER A
SOLE LICENSE FROM GRAHAM BLATCHFORD
www.skcltd.com
Pump inlet
Pulsation dampener
Figure 4. CalChek Full Calibration Train
5. Initiate the CalChek function from the pump. See pump operating instructions.
6. When airfl ow through the fl owmeter is detected, it automatically produces its fl ow rate reading via the CalChek serial interface at
3.5-second intervals. The pump will automatically read in the fl ow readings as required to complete the CalChek process and will
indicate completion of the process on its screen display.
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.
www.skcinc.com
Form 39013 Rev 1905
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Calibrate the chek-mate Flowmeter
SKC recommends a minimum calibration interval of one year, however, users are responsible for determining the most suitable interval
to meet their quality assurance system requirements; they should also consider the frequency of use and operating environment.
Calibration Method
The chek-mate is designed primarily to perform fl ow calibration of air sample trains that incorporate an air sample pump to
provide the airfl ow, which is pulled through the chek-mate by the vacuum generated by the air sample pump. To ensure that
the SKC factory fl ow calibration is representative of how the chek-mate is actually used, the fl ow calibration is performed under
vacuum. Factory calibrations are performed by applying the airfl ow alternately to the chek-mate and reference fl owmeters.
SKC recommends that subsequent fl ow calibrations of the chek-mate fl owmeter are also performed under vacuum and by
applying the airfl ow alternately to the chek-mate and reference fl owmeters. However, positive pressure fl ow calibration using
compressed laboratory air or nitrogen gas is also acceptable, and series connection of the chek-mate and reference fl owmeters
under either vacuum or positive pressure is also acceptable.
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 predefi ned fl ow rates. NIST-traceable and ISO/IEC 17025:2005 services are available. Order
SKC CAL Service at www.skcinc.com.
Important notes/recommendations for third-party fl ow calibrations:
• Before sending the chek-mate for third-party calibration, install a new battery in it.
• Enclose a copy of these instructions with the chek-mate when sending it to a third-party calibration laboratory.
• Airflow is indicated in ml/min on Cat. Nos. 375-00205N and 375-00205 and in L/min on Cat. Nos. 375-0550N and 375-0550 at
the current ambient temperature and atmospheric pressure; therefore, the reference flow measurement must be corrected to
these conditions for comparison with the chek-mate indicated flow reading.
• Factory flow calibration is performed under vacuum, therefore, the calibration gas used is ambient air with relative
humidity of 50 ± 20%. When performing positive pressure flow calibrations using compressed dry laboratory air or nitrogen
gas, correct for the difference in gas density.
• When performing flow calibration under vacuum with the chek-mate connected in series with the reference flowmeter,
connect the chek-mate with its inlet open to atmosphere.
• When performing flow calibration under positive pressure with the chek-mate connected in series with the reference
flowmeter, connect the chek-mate with its outlet open to atmosphere.
Accessories/Replacement Parts
CalChek Communication Cable, for use with Cat. Nos. 375-0550N and 375-0550, required for automatic fl ow
calibration of AirChek TOUCH Sample Pump
Pulsation Dampener, for use with Cat. Nos. 375-0550N and 375-0550, required for CalChek Full Calibration of
AirChek TOUCH Sample Pump
Battery, 9-volt alkaline P37500
375-200
375-100
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.
www.skcinc.com
Form 39013 Rev 1905
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Appendix
Performance Profi le
Flow Measurement
Range
Airfl ow Display
Resolution
Airfl ow Accuracy ± 1% of reading for 750 to 5000 ml/min (medium fl ow) and 50 to 500 ml/min (low fl ow)
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 Medium fl ow: 8.3 oz (236 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.
Medium fl ow: 0.5 to 5 L/min
Low fl ow: 20 to 500 ml/min
Medium fl ow: 0.001 L/min
Low fl ow: 0.01 up to 100 ml/min and 0.1 above 100 ml/min
2.5% outside of above ranges
32 to 104 F (0 to 40 C)
20.7 to 32.2 in Hg (700 to 1090 mbar)
Low fl ow: 8.2 oz (232 gm)
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 39013 Rev 1905
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