Industry
Air, water, noise and emissions monitoring instruments for regulatory compliance and site surveillance.
Environmental monitoring instruments measure conditions that are reported to somebody else. That single fact reorganises the priorities: the method is usually fixed by a regulation, a permit or a standard, the calibration interval is prescribed rather than chosen, and the deliverable is a record that an authority or an auditor will accept rather than a reading that merely happens to be accurate.
The specification conversation therefore starts with the obligation. Which parameter, under which method, reported in which format and at what frequency - those answers determine the instrument class, the calibration arrangement and the data handling before any technical comparison is meaningful. An instrument that measures well but cannot produce an acceptable record does not satisfy the requirement, however capable it is.
The second theme is that environmental measurements are samples of a variable environment rather than readings of a controlled process. Air moves, water flows, noise reflects and weather changes, so siting and sampling strategy affect the result as much as the instrument does. Unlike a process measurement, there is frequently no later opportunity to correct the placement, which is why it belongs in the planning stage rather than in the installation.
Site boundary and community monitoring of gases, particulate and dust. Instruments run continuously, and siting and exposure determine whether the record actually represents the area being reported on.
Flue gas, particulate and flow measurement at the point of release. The method is normally prescribed, the sample has to be conditioned, and the record frequently forms part of a permit condition.
Effluent, surface water, groundwater and process discharge. pH, conductivity, turbidity, dissolved oxygen and specific substances are measured, and continuous measurement is often required alongside periodic sampling.
Boundary and workplace noise, wind and weather, and the general conditions around the site. These measurements often exist to explain or support the others, and they carry their own calibration requirements.
| Measurement | What is measured in this sector | Instruments commonly specified |
|---|---|---|
| Gas and vapour | Ambient and stack concentrations of carbon monoxide, carbon dioxide, nitrogen oxides, sulphur dioxide, volatile compounds and oxygen | Process and ambient analysers using electrochemical, infrared, photoionisation or optical methods, with sample conditioning designed for the dust, condensate and temperature present |
| Particulate and dust | Ambient particulate concentration, dust deposition, and particulate in a stack | Optical scattering and gravimetric samplers for ambient work, and optical or gravimetric measurement for emission monitoring, with the method fixed by the permit |
| Water quality | Effluent and surface water chemistry, including pH, conductivity, turbidity, dissolved oxygen and specific substances | In-line analysers and transmitters with sample conditioning, and comparable instruments at the sampling points where continuous measurement is required |
| Flow | Effluent discharge, surface water, and the flow in a stack or duct | Electromagnetic and ultrasonic meters for liquid, and differential-pressure or ultrasonic measurement for stack flow, where the velocity profile and the straight runs available dominate the result |
| Noise | Boundary, workplace and environmental noise | Integrating sound level meters with the correct weighting and time constant, plus an acoustic calibrator used before and after a measurement series |
| Meteorology and data handling | Wind speed and direction, temperature, humidity, rainfall, and the assembled site record | Weather station instruments alongside loggers and monitoring software that assemble the individual measurements into the record that has to be reported |
The applicable method, the calibration interval and the form of the record are normally prescribed before the instrument is chosen, and they should be stated in the enquiry.
Frequently asked
The questions that come up in this sector before an order. If yours is not here, send it with the duty and we will answer it alongside the quotation.
Start from the obligation rather than from the instrument. The regulation, permit or standard normally names the method, the calibration interval and the reporting format, and the instrument has to satisfy those three before any technical comparison is worth making. An instrument that measures accurately but cannot produce an acceptable record does not meet the requirement, so the obligation belongs at the beginning of the enquiry.
Continuous measurement is required where the parameter varies in a way that sampling would miss, or where a permit demands a continuous record. Periodic sampling suits parameters that change slowly or where the analytical method is a laboratory one, and it is frequently used alongside continuous measurement for confirmation. Which applies is normally set by the obligation, so it is worth confirming rather than choosing on cost.
Because an environmental measurement is a sample of a variable environment rather than a reading of a controlled process. A monitor in a stagnant corner, a sampler downstream of an inlet or a noise meter beside a reflecting wall measures the placement as much as the site, and unlike a process measurement it usually cannot be corrected later. The siting decision therefore belongs in the plan rather than at the installation.
A method fixed by the permit, a sample that is conditioned to suit the analyser, and a record that satisfies the reporting requirement. Dust, condensate and temperature are the usual difficulties, and the sample conditioning is frequently the part that determines whether the system works in practice. Where flow at the release point is also reported, the velocity profile and the straight runs available affect the result as much as the instrument.
With an integrating sound level meter, using the weighting and time constant the applicable method specifies, and verified with an acoustic calibrator before and after the measurement series. The result is normally an averaged level over a defined period rather than an instantaneous reading, and the microphone position and the reflecting surfaces around it affect the figure. Which weighting and which period apply come from the standard rather than from a preference.
The parameter and the regulation, permit or standard it is reported under; the method and the calibration interval that apply; whether the measurement is continuous or periodic; the location, exposure and available power; the record format required; and whether the data has to reach a system. The obligation usually determines the specification, so it should be the first item in the enquiry.
Published products
BAL-220 · Laboratory Balances Reference listing
Analytical balance with a 220 g capacity and 0.1 mg readability, an electromagnetic force compensation cell and an internal calibration weight.
SLM-30 · Noise Meters Reference listing
Class 2 integrating sound level meter measuring sound pressure level and equivalent continuous level, with A and C weighting and octave analysis.
UVS-1900 · Spectrophotometers Reference listing
Double-beam UV-Vis spectrophotometer covering 190 to 1100 nm with a scanning monochromator, for quantitative analysis and wavelength scanning in the laboratory.
Send the process conditions and the standard you have to meet, and we will confirm the instrument, availability and documentation that can accompany the order.
Request for quotation
Send the technical detail and we will confirm availability, lead time and terms. In-stock items ship within 48 hours; customized specifications typically take 2-10 days. Minimum order quantity is 1 pc.