Calibrations
Our calibration laboratories include:
- Acoustic Laboratory for calibration of Sound Level Meters, Dosimeters, Octave Band Filters, Audiometers, and Field Calibrators
- Air Flow Laboratory for calibration of Velometers, Balometers, Anemometers, Rotating Vane Anemometers, Flow Hoods and other velocity instruments
- Multi-channel Particle Counter Laboratory
- Mass Concentration Aerosol Laboratory
- Heat Stress Environmental Chamber for calibration of Heat Stress Monitors
- Thermal Probe Calibrator for Thermo Anemometers
- Flow Calibration Laboratory for calibration of Air Sampling Pumps and Pump Calibrators
- Temperature Calibration for Indoor Air Quality Instruments
- Humidity Calibration for Indoor Air Quality Instruments
CIHE is the value leader in precision instrument calibrations.
CIH Equipment Company, Inc. features various specialized calibration laboratories, each designed to accommodate the growing demand for required annual instrument calibrations.
Our certified technical personnel in the calibration laboratories have over 20 years of job experience and technical training. We provide N.I.S.T. traceable calibrations to current A.N.S.I. standards. Our quality laboratories provide professional, cost effective, friendly services with fast turn around time.
Traceable Calibrations
CIHE Calibrations are "traceable" to national measurement standards. CIHE is able to support these claims of traceability with valid, current documentation and records of the equipment used in the calibration process. Incorrect traceability claims may make a company liable for damages.
The requirement for traceability implies the ability to relate individual measurement results, with a stated uncertainty, through an unbroken chain of comparisons to a stated reference source, usually the Canadian national measurement standards maintained by CIHE, or to intrinsic standards based on fundamental natural constants with values assigned or accepted by CIHE.
To adequately establish an audit trail outside CIHE for purposes of traceability, a calibration result should include:
- the assigned value
- a stated uncertainty
- the identity of the standard(s) used in the calibration
- the specification of any environmental conditions of the calibration that require the application of correction factors if the standard or equipment is to be used under different environmental conditions
CIHE supports the practice of making its clients aware of traceability to national measurement standards and providing them with details on how traceability was established.
Measurement Uncertainty
The uncertainty of the measurement contained in a CIHE calibration report, in terms of CIHE's realization of the internationally-adopted representation of the unit in question, is an expanded uncertainty representing a confidence level of approximately 95% obtained by multiplying the combined standard uncertainty (one standard deviation) by a coverage factor of k = 2. (ISO Guide to the Expression of Uncertainty in Measurement, First Edition, 1993).
Uncertainty is normally the actual uncertainty of CIHE measurement results, including the effect of such influencing factors as temperature and humidity, which may not have been fully controlled during the measurement. It does not normally include estimates of the uncertainties likely to be introduced by the transfer of the measured device to the client's location and its use there as a standard for other measurements. Such uncertainties are due to effects, which include, but are not limited to, transportation of the measured device to the client's location, temperature, humidity, passage of time, chemical reactions, mechanical damage, and conditions of use in the client's location.
Environmental Conditions
Calibration of client equipment is normally performed in the ambient conditions of the laboratory concerned. Some calibrations are performed in a special microclimate environment, as required by the client.
