Expertise
A sound measurement depends on what was decided beforehand.
Thermal mapping, measurement, calibration and characterisation of equipment.
A measurement plan is justified, not improvised.
A reading is only worth the plan that produced it and the reading made of it. We choose and position the instruments, write the protocol before the campaign, build the measurement plan, maintain calibration traceability and interpret the results. Temperature, humidity and CO₂.
What we do
Four capabilities, exercised before, during and after the measurement.
- choose and position the instruments according to the situation, the accuracy expected and the installation conditions
- write the protocol before the campaign: layout, conditions, objectives
- build the measurement plan: working space, number of points by volume, test duration, determination of steady state
- interpret the normative quantities and how they are calculated, and state what they allow you to conclude
- maintain calibration traceability, one certificate per probe, with its number and date
In which situations
Metrology expertise is rarely called in to place probes.
- an enclosure must be characterised and the protocol is still to be written
- an existing report must be reviewed, its quantities and conclusions checked
- the number of measurement points or the test duration chosen are being questioned
- the permanent monitoring probe is in place and nobody can demonstrate that it is well placed
- a choice must be made between a self-contained logger and a probe wired to an acquisition system
- an auditor asks how steady state was determined
With what
Instruments and a reference standard, chosen for the situation.
- PT100 probes, platinum resistance sensors, accuracy in the order of ±0.1 °C, for critical enclosures
- iButton loggers, self-contained and unwired, accuracy in the order of ±0.5 °C, for small volumes
- FD X15-140, its criteria and the graphical method in clause 8.3 for determining steady state
- analysis software that computes the normative criteria and produces a report usable in an audit
- documented management of calibration certificates, probe by probe
The quantities covered are temperature, humidity and CO₂.
What it produces
Enough to defend a result, not merely display it.
- a protocol written before the campaign, stating what will be measured and why
- a justified measurement plan, whose number of points follows from the volume under the standard
- four quantities computed and interpreted: homogeneity, stability, setpoint deviation, indication error
- an analysis restricted to the window where every probe is stabilised, hence a defensible conclusion
- documented calibration traceability, position by position
This expertise is the measurement capability, and it extends beyond thermal work. The campaign itself, bounded, with its probes, protocol and report, belongs to the Thermal mapping service.
Frequently asked questions
Answers to the most common questions before starting a project with MAJ Solutions.
What is the difference between calibrating a probe and thermal mapping?
Calibration checks that a probe measures correctly, by comparing it with reference standards in a laboratory: it concerns the instrument. Mapping uses several calibrated probes to describe how temperature is distributed inside a piece of equipment: it concerns the enclosure. One depends on the other, and our reports record the calibration certificate of every probe used, with its number and date.
How do you choose the probes and measurement points for a thermal mapping?
The number of measurement points follows from the volume of the enclosure, under the rule set by FD X15-140, and their position follows the mapping plan, which delimits the working space and places each probe. The type of probe depends on the accuracy required and the installation conditions: PT100 probes for critical enclosures, self-contained iButton loggers for small volumes with no wiring. Everything is written down before the campaign, not during it.
Does a measurement result have to hold up in front of an auditor?
Present the equipment, the existing protocol if there is one and the question at hand. An initial discussion will say what needs redoing and what already holds.