SKC chek-mate User manual
www.skcltd.com
chek-mate Air Flowmeter
Operating Instructions
This manual covers the following models:
375-00205 / 375-0550
Page 2 007-03-004 Issue D www.skcltd.com
Purchase Details and Service Record
Thank you for choosing an SKC product. Your purchase is covered by our warranty, details of which can
be found inside the rear cover of this manual.
Product Model Number Product Serial Number Date of Purchase
SKC recommends a minimum service interval of one year for this product. The first service is due one
year from the date of purchase, and then at yearly intervals on this date. However, it is the responsibility
of the user to perform a risk assessment to determine the necessary frequency of servicing that is
required.
Service Date Service Date Service Date
159
2 6 10
3 7 11
4 8 12
Please note that SKC Ltd is the only authorised service centre in the UK, guaranteeing you access
to the full range of genuine SKC replacement parts. For all other areas a full list of SKC-approved
distributors and service centres can be found at www.skcltd.com
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Contents
Specifications................................................................................................................2
Introduction to the chek-mate Flowmeter........................................................................4
General Information .......................................................................................................6
Diagram of the chek-mate Flowmeter .............................................................................8
Using the chek-mate Flowmeter ...................................................................................10
Battery Care................................................................................................................14
Calibration of the chek-mate Flowmeter........................................................................16
Notes..........................................................................................................................18
Warranty .....................................................................................................................20
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Specifications
Parameter Model 375-00205 Model 375-0550
Airflow range 20 ml/min to 500 ml/min 0.5 litre/min to 5.0 litre/min
Airflow display resolution < 100 ml/min : 0.01 ml/min
>= 100 ml/min : 0.1 ml/min 0.001 litre/min
Airflow accuracy
20 to 50 ml/min : ±2.5% of
reading
50 to 500 ml/min : ±1% of
reading
0.5 to 0.75 litre/min : ±2.5% of
reading
0.75 to 5.0 litre/min : ±1% of
reading
Weight 232 g (8.2 oz) 236 g (8.3 oz)
Operating temperature range 0 °C to 40 °C (32 °F to 104 °F)
Operating atmospheric
pressure range 700 mbar to 1090 mbar (20.7 inHg to 32.2 inHg)
Operating altitude Sea level to approximately 3050 m (10000 ft) above sea level
Enclosure IP rating IP40
Battery 9V alkaline disposable PP3 / 6LR61 / 1604A or equivalent, or
8.4V NiMH rechargeable PP3 / 6HR61 / 8.4H5 or equivalent
Automatic power off timer 15 minutes
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Specifications
83.5mm ( 3.3”) 33.5mm ( 1.3”)
178.5mm ( 7.1”)
Note:
SKC Ltd reserves the right to make changes to the specification and design of this product at any time
without prior notice to the end user.
The chek-mate flowmeter is manufactured by SKC Ltd under a sole license from Graham Blatchford.
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Introduction to the chek-mate Flowmeter
The chek-mate flowmeter is designed specifically for use in the occupational health and
safety industry for the purpose of calibrating the air flow rate into air sample trains. Its flow
range makes it suitable for use across a broad range of air sampling methods and with a
broad range of air samplers, sample media and air sample pumps.
Operating Principle
The chek-mate is an orifice type flowmeter. Its reading is determined by measuring the
pressure drop across the orifice caused by the flow of air through the orifice, using a
differential pressure sensor. This type of flowmeter gives a mass flow reading meaning
that the pressure drop across the orifice will be constant for a given mass flow of gas
independent of the density of the gas.
The chek-mate also incorporates an ambient temperature sensor and an atmospheric
pressure sensor and uses the readings of these sensors to correct the mass flow reading
generated by measuring the pressure drop across the orifice to the current ambient
temperature and atmospheric pressure. This correction provides an indicated flow reading
that is equivalent to a volumetric flow reading when the inlet of the flowmeter is open to
atmosphere.
CalChek Pump Calibration
The 375-0550 chek-mate model incorporates a CalChek serial interface which enables it to
communicate directly with SKC AirChek 2000, AirChek 3000 and AirChek Touch pumps, in
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Introduction to the chek-mate Flowmeter
order to perform automatic flow calibration of these pumps.
The chek-mate is connected to the pump using a CalChek communication cable (P/N 375-
200) which plugs into a socket on the right hand side of the chek-mate, and to the serial
interface port on the pump.
The chek-mate automatically outputs its flow rate reading via the CalChek serial interface at
3.5 second intervals when airflow through the chek-mate is present.
Refer also to the specific pump user manual for detailed instructions on performing CalChek
calibration.
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General Information
1) Care of the chek-mate Flowmeter
• Use only the specified 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.
• Avoid extended use of the flowmeter in areas with high levels of airborne particulates.
An external inlet filter (not SKC supply) can be used with the chek-mate flowmeter if
this cannot be avoided. Any filter used should have high collection efficiency (collect the
majority of all dust particles) and low back pressure.
• Ensure that fluids do not enter the flowmeter inlet or outlet ports.
• If the flowmeter has been stored in a cold location and is immediately taken to a hot,
humid location, do not use the flowmeter until it has stabilised to the higher ambient
temperature to prevent condensation forming inside the flowmeter.
• The flow meter case is IP40 rated: it is not rated as waterproof or splashproof and,
therefore, must not be used where it is possible for water to enter the casing.
• There are no user serviceable parts within chek-mate flowmeter. Opening of the chek-
mate case will void the product warranty and could affect the instrument calibration. An
anti-tamper warning label is fitted to the case which will identify that the case has opened.
Warning - Failure to follow these guidelines will void the product warranty.
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General Information
2) The WEEE Directive
This product is marked with the crossed out wheelie bin symbol, which identifies that it falls
within the scope of the European Directive 2002/96/EC on waste electrical and electronic
equipment (WEEE). At the end of it’s useful life, this product must be disposed of in an
environmentally sound way as detailed in the Directive. Note that the battery must be
separated from the product and disposed of as detailed in the Batteries Directive (see
below). Please contact your local distributor or SKC Ltd for further details on how to comply
with the requirements of the WEEE Directive. SKC Ltd’s producer registration number is
WEE/KH0054TQ.
3) The Batteries Directive
The alkaline disposable battery supplied with this flowmeter and any spare
batteries purchased for it, fall within the scope of the European Directive
2006/66/EC on batteries and accumulators and waste batteries and
accumulators. At the end of the battery’s life it must be disposed of in an
environmentally sound way as detailed in the Directive. Please contact
your local distributor or SKC Ltd for further details on how to comply with
the requirements of the Batteries Directive. SKC Ltd’s batteries producer
registration number is BPRN00454.
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8
Diagram of the chek-mate Flowmeter
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