FAQs in General
Questions
- What are the Terms and Conditions for the sale goods in Singapore?
- How can I access MTL Partner portal?
- How do I initiate an RMA ( Return Material Authorisation) or Product Return?
- What do the various temperature classifications mean?
- What do the various gas groups mean?
- What do the various zones represent?
Answers
What are the Terms and Conditions for the sale goods in Singapore?
The Terms and Conditions are attached in the PDF. For any more questions please contact the Singapore head office
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How can I access MTL Partner portal?
MTL offers its key customers and partners access to its customer portal. Customer portal could be accessed via the MTL Extranet. This requires registration and the registration process could take up to 3 working days.
How do I initiate an RMA ( Return Material Authorisation) or Product Return?
For MTL Intrinsic Safety, Fieldbus, Industrial Ethernet and Industrial Wireless Products please contact your local MTL sales office or representative.
For Gecma / HMI products please indicate and RMA via RMA Portal.
What do the various temperature classifications mean?
| Gas-air mixtures can be ignited by contact with hot surfaces; consequently electrical equipment used in hazardous atmospheres is required to be classified according to its maximum surface temperature. From the table below it can be seen, for example, that an item classified as T4 will not exceed a surface temperature of 135°C. These classifications are based upon an ambient temperature of 40°C, unless otherwise specified on the device. If the equipment is to be used in ambient temperatures higher than this, the temperature class must be reassessed. |
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What do the various gas groups mean?
| Gas grouping is a way of arranging the majority of flammable gases according to the energy required to ignite them. Most countries mark all surface industry equipment with the Roman numeral II: the gas groups are then sub-divided into IIA (propane), IIB (ethylene) and IIC (hydrogen) – IIA being the least incendive. The names given in parentheses are representative gases; frequently used to describe the gas group. America and Canada chose to use different group names when marking equipment but, of course, the ignition energy remains the same. |
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What do the various zones represent?
| Hazardous area are divided into zones to indicate the probability of a hazardous mixture of gas (or dust) and air being present. The present IEC standard defines the zones as follows: | ||||
| Zone 0: | A place in which an explosive gas-air mixture is continuously present for long periods, > than 10 000 hrs/annum. |
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| Zone 1: | A place in which an explosive gas-air mixture is likely to occur in normal operation, >10 and less than 1000 hrs/annum. |
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| Zone 2: | A place in which an explosive gas-air mixture is not likely to occur, and if it occurs it will only exist for a short term, <10 hrs/annum. | |||
| Zone 20: | A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is present continuously, or for long periods or frequently. | |||
| Zone 21: | A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur in normal operation occasionally. | |||
| Zone 22: | A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation, but, if it does occur, will persist for a short period only. | |||