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Frequently Asked Questions

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Log into your account on our website to view your Order History, details, as well as status of all your orders. Order status will be updated as and when on the account. You will also receive email notifications on your registered email ID, as and when.

Post purchase and delivery, please register your Metravi product at https://bit.ly/Metravi-Product-Registration. Post receiving and checking your application, we will issue your Warranty Certificate.

Please ensure (before submitting the form) that you upload images of the product with the serial no showing as well as your purchase invoice.

All objects emit infrared energy. The hotter an object is, the more active its molecules are, and the more infrared energy it emits. An infrared thermometer houses optics that collects the radiant infrared energy from the object and focus it onto a detector. The detector converts the energy into an electrical signal, which is amplified and displayed.

As the instrument is placed further from the target, the spot size resolved by the instrument becomes bigger, therefore the target has to be large enough for the instrument to view it.

Metravi products carry a one year warranty against manufacturing defects. The warranty is in effect from the date of invoicing and despatch. Please read the operating manual carefully for instructions to power on and use the product. In case your product does not work as required to or does not switch on,  you need to inform us of the same immediately. Please share images and a video on our Customer Care Whatsapp Number 9073384641. We will assist you with the same. In case the online assistance does not help, the product/part has to be returned back to us for investigation and consequent replacement/repair. Transformers, Chargers, Batteries and Adaptors are not included under any warranty. You can read our full Warranty Document here.

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We despatch the confirmed orders, for products which are on stock, within a maximum of 2-3 working days.
In case, the ordered product is out of stock, we will inform you of the same along with expected shipment date.

We use reputed couriers and tracking details will be shared with you as soon as the order is despatched. Usual delivery time varies from 2 to 10 days depending on location.

 

 

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METRAVI is one of the largest manufacturer & distributor of ELECTRICAL & ELECTRONIC TEST and MEASURING INSTRUMENTS in INDIA. We are in this line of business 1970 onwards. For more than 50 years now, we are catering to the instrumentation needs of almost all major Government, Semi-Government, private and public sector industries, including Railways, Defence, Aviation, Telecom, Petroleum, Cement, Power Generation, Iron & Steel, Plywood, Automobile, Paper, Chemicals, Heavy Equipment, Automation, etc. Hospitals, Nursing Homes, Colleges & Educational Institutions also source our products. Read all about Metravi Instruments here.

A solid understanding of infrared technology and its principles lies behind accurate temperature measurements. When the temperature is measured by a non-contact device, the IR energy emitted from the measured object passes through the optical system of the thermometer and is converted to an electrical signal at the detector. This signal is then displayed as a temperature reading. There are several important factors that determine accurate measurement. The most important factors are emissivity, distance to spot ratio, and field-of-view.

Emissivity. All objects reflect, transmit and emit energy. Only the emitted energy indicates the temperature of the object. When IR thermometers measure the surface temperature they sense all three kinds of energy, therefore all thermometers have to be adjusted to read emitted energy only. Measuring errors are often caused by IR energy being reflected by light sources.
Some IR thermometers allow you to change the emissivity in the unit. The value of emissivity for various materials can be looked up in published emissivity tables.

Other units have a fixed, pre-set emissivity of 0.95, which is the emissivity value for most organic materials and painted or oxidised surfaces. If you are using a thermometer with a fixed emissivity to measure the surface temperature of a shiny object you can compensate by covering the surface to be measured with masking tape or flat black paint. Allow time for the tape or paint to reach the same temperature as the material underneath. Measure the temperature of the taped or painted surface. That is the true temperature.

Distance to spot ratio. The optical system of an infrared thermometer collects the infrared energy from a circular measurement spot and focuses it on the detector. Optical resolution is defined by the ratio of the distance from instrument to the object compared to the size of the spot being measured (D:S ratio). The larger the ratio number the better the instruments resolution, and the smaller the spot size that can be measured. The laser sighting included in some instruments only helps to aim at the measured spot.
A recent innovation in infrared optics is the addition of a Close Focus feature, which provides accurate measurement of small target areas without including unwanted background temperatures.

Field-of-view. Make sure that the target is larger than the spot size the unit is measuring. The smaller the target, the closer you should be to it. When accuracy is critical make sure that the target is at least twice as large as the spot size.

There are important things to keep in mind while using infrared thermometers:

  • Measure surface temperature only. The IR thermometer cannot measure internal temperatures.
  • Do not take temperature measurement through glass. Glass has very distinctive reflection and transmission properties that do not allow accurate infrared temperature reading. Infrared thermometers are not recommended for use in measuring shiny or polished metal surfaces (stainless steel, aluminium, etc.). (See Emissivity.)
  • Locate a hot spot. To find a hot spot aim the thermometer outside the area of interest, then scan across with an up and down motion until you locate the hot spot.
  • Watch for environmental conditions. Steam, dust, smoke, etc., can prevent accurate measurement by obstructing the units optics.
  • Ambient temperatures. If the thermometer is exposed to abrupt ambient temperature differences of 20 degrees or more, allow it to adjust to the new ambient temperature for at least twenty minutes.
To take a temperature measurement, just point the unit at the object you wish to measure. Pull the trigger and read the temperature on the units LCD. Be sure to consider distance-to-spot size ratio and field of view.

Products available on backorders are currently out of stock but fresh inventory is expected soon.

You may place an order and we would be able to despatch the order within 15-30 days in most cases.

Alternatively, you can place an enquiry using the Add to Enquiry button on the product page and we will let you know how soon we will have ready availability for the respective product.

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