Comparison Bosch UniversalTemp 0603683100 vs Fluke 59 Max

The range of surface temperatures that the instrument can effectively measure.

In general, the meaning of this parameter is quite obvious. We only note that an extensive operating range is not always an advantage. First, it affects the cost of the device; secondly, when the range is extended, the measurement accuracy may deteriorate. So when choosing, you should not chase the maximum temperature range, but take into account real needs: for example, it hardly makes sense to choose a pyrometer with an upper limit of 500 °C for measuring the quality of thermal insulation and determining heat leaks in residential premises. It is conditionally possible to divide pyrometers into those that are for measuring low temperatures, and, accordingly, for high ones.

Instrument sighting index.

The sighting indicator is the ratio between the distance to the surface, the temperature of which is measured, and the diameter of the spot that enters the field of view of the device. For example, if at a distance of 2 m the device will cover a zone of 10 cm (0.1 m), then the sighting index will be 2 / 0.1 = 20.

When choosing for this parameter, it is worth considering the expected measurement conditions — the dimensions of the objects whose temperature is supposed to be measured, and the distances to them. At the same time, it is worth remembering that for accurate measurement, the measured surface must completely occupy the field of view of the pyrometer — otherwise the device will also “see” foreign objects, the radiation of which will distort the measurement results. Therefore, for long distances, models with high sighting rates are recommended — 40, 50, etc. If measurements are planned to be carried out at a distance of one or two metres, and the measured objects are quite large, you should pay attention to models with relatively small values of this parameter — 10 , 20 etc.

Approximate response time of the device, namely the time that elapses from pressing the measurement button until the results are shown on the display (or from a change in temperature to a change in the readings on the display, if we are talking about continuous measurement mode). In most cases, this parameter does not play a special role: even in the "slowest" devices, it does not exceed 1000 ms (1 s), which does not lead to any inconvenience. It is worth paying attention to the response time only if the device is planned to be used to measure the temperature of fast moving objects: the faster the reaction, the less time you have to keep the measured object in the field of view of the pyrometer, the lower the likelihood that this object can “jump out” from the field of view until the end of measurements.

Temperature measurement accuracy provided by the pyrometer, in degrees. It is indicated by the maximum deviation in one direction or another, which the device can give out during operation. For example, if the specification says 1.5°C and the reading reads 80°C, the actual temperature could be between 78.5°C and 81.5°C. Thus, the smaller the number in this paragraph, the lower the error and the higher the accuracy of the device. At the same time, high accuracy has a corresponding effect on cost.

It should be noted that this designation often turns out to be very conditional, and the detailed characteristics may contain various clarifications regarding errors. So, the accuracy of measurements is often given simultaneously in degrees and in percentages with a wording like "± 2 °C or ± 2%, whichever value is greater." For details on percentage error, see Measurement Accuracy below. And this record means that the actual measurement error in degrees may turn out to be even higher than that directly stated in the characteristics — for example, 2% of 500 °C gives a deviation of ± 10 °C. In addition, there may be other refinements — for example, at sub-zero temperatures, the deviation can be ± 2 °C plus 0.05 °C for each degree below zero (that is, increase with decreasing temperature). So if high measurement accuracy is critical for you, you should carefully read the manufacturer's documentation.

The accuracy of temperature measurements provided by the pyrometer, in percent. It is indicated by the maximum deviation in one direction or another, which the device can give out during operation. The percentage is taken from the actual temperature value; In fact, this means that the greater the deviation from zero, the higher the error can be. For example, at 100 °C an error of 2% gives a deviation of ±2 °C, and at 500 °C this value already reaches ±10 °C. However, this does not mean that when approaching zero, the error disappears — for this case, the measurement accuracy in degrees is given in parallel in the characteristics (see above). In this case, wordings like “± 2 °C or ± 2%, which of the values will be greater” are used; at low temperatures, when the percentage error will be unrealistically small (for example, for 20 °C, the same 2% will give only ± 0.4 °C), it is worth evaluating the accuracy of measurements by the error in degrees.

The range of ambient air temperatures over which the instrument can perform its functions normally.

All modern pyrometers are guaranteed to work at room temperature. At the same time, they usually allow deviations from it within 15 – 20 °C — for example, in many models, the operating temperature range is claimed within 0 ... 40 °C. So you should pay attention to this indicator if the device is planned to be used at temperatures below zero, or vice versa, in hot conditions — not every model is able to work normally with one or another “extreme”.

Note that going beyond the range of permissible temperatures does not necessarily lead to a breakdown of the device. However, one should not deviate from these recommendations, at least in the light of the fact that under abnormal conditions the device begins to give too high an error, and there is no need to talk about any measurement accuracy.

- "6LR61". A standard 9-volt Krona battery is rectangular in shape, with a pair of contacts at one end. Quite a popular option: for a number of reasons, 9 V voltage is very convenient for use in pyrometers.

—AA. A popular standard size of replaceable cells is known as “pen-cell batteries”. Similar elements are also available in the form of rechargeable batteries. In pyrometers, such power supply is less common than “Kronas” - in particular, because several AA batteries are usually required for effective operation. However, this is also a fairly popular option.

- AAA. Another common standard size of replaceable elements is “pinky batteries”. Similar to the AA described above in everything, with the exception of a smaller size and, accordingly, lower capacity. They are used mainly in compact devices, for which even AA batteries are too bulky.

— Branded battery. Powered by its own battery of the original standard, which can also be made non-removable. On the one hand, such power has a number of advantages over replaceable batteries. Thus, the battery is initially included in the kit, it does not need to be purchased separately; and when the charge is exhausted, there is no need to spend money on fresh batteries - just leave the device to charge. On the other hand, charging requi...res a power source and takes quite a long time, while batteries, if there are spare ones, can be changed in a matter of seconds. Therefore, this option was not particularly widespread.

- CR2032. Quite miniature “tablet” batteries with a diameter of 32 mm and a thickness of 2 mm. Due to their low capacity, they are used extremely rarely - exclusively in miniature devices designed for maximum compactness and, as a rule, intended for short distances (up to 1 m).

There are also models with combined power supply that can operate from one or another source.

— “Krona” / external power supply. Models capable of operating both from the Krona battery described above and from the supplied AC power supply. The advantage of this option is that if there is an outlet, the device can be connected to it, saving battery power (or even charging it if a battery in the “Krona” form factor is used for power).

— AA / branded battery. Devices that can operate both from replaceable AA batteries and from a branded battery. To do this, the package usually includes an adapter that allows you to install a set of batteries instead of the battery. Note that the battery itself is not necessarily supplied with the pyrometer - on the contrary, batteries may be included in the package, but the battery must be purchased separately (or removed from another instrument of the same brand - some manufacturers use universal interchangeable batteries for their devices). See above for more details on each type of power supply, and their combination gives the user a choice and, in theory, allows them to mutually compensate for deficiencies. On the other hand, in most cases it is easier to buy replacement elements in the form of batteries than to mess with a branded battery, so this option is not particularly widespread.

The maximum operating time of the pyrometer on one battery or accumulator charge (see "Power").

In general, the meaning of this parameter is quite obvious, it is worth noting only one nuance: different brands of replaceable batteries can vary significantly in capacity. Therefore, when using inexpensive elements, the actual operating time of the pyrometer may be significantly less than the claimed one.

The degree of protection of the device case according to the IP standard.

This standard describes the protection of the “hardware” from contamination and moisture ingress. As a standard, the degree of protection is written in two digits, for example IP54; the first of these numbers indicates protection against dust and foreign objects, the second — from moisture. Detailed interpretations of the designations according to the IP standard can be found in special sources. Here we note that the highest levels of dust protection are 5 (dust resistance) and 6 (dust tightness), water protection — 7 (the possibility of immersion to a depth of up to 1 m) and 8 (the possibility of continuous operation at a depth of 1 m or more). At the same time, there are models on the market with a water protection level of 0 — this means that such devices do not allow any ingress of moisture at all.