All who uses a resistance heater in a production equipment (automatic injection machines, plodders, moulds etc.) know, how occasionally happen, electrical



and as trailer hours idle because of their exit out of operation if this machinery uses in serial or quantity production costs much are accident-sensitive.

At existing market saturation of electric heaters the select of the Gud supply contractor turns to a challenge.

To simplify its solution we will result some from conventional among specialists of yardsticks who will allow a user to orient correctly in the

market.

Value of per-unit-area power of the calefactor declared by the

manufacturer.

The it above, the above level and expected reliability of job of a calefactor. As of today attained level of technique allows to produce thermal radiators W isolators from mica B4 8, 5 VT / of sm 2. At the booking of calefactors W smaller specific power for the manufacturers who have attained world level, it is possible to expect considerably major reliability and resource of job, than for the manufacturers working on a limit of the

capabilities.

Quality of a work face.

It is specially appreciable on ring calefactors small (B4 50 mm) diameter. For Gud manufacturers, irrespective of the form of a calefactor, the work face ideally fits to to a heat uped product. Retention of fractures (is Gud felt if to carry out an arm on a work face), retention of air gaps between a calefactor and a product (it is visible on a lumen) indicates a low level of production and low-level expected

reliability.

Operational safety.

Metallic envelopes of calefactors W operating voltage more than 50 In should be earthed. 

Spacing intervals from current carrying parts B4 the current-carrying envelopes which are not alive, 4 calefactors W operating voltage B4 250 In alternating-current should be not less than 5 mm, and at pressure 380 In - 6 mm.

Electric strength of insulant of such calefactors should be not less than 1500 In alternating-current.

If the indicated requests are not executed to use such thermal radiators

DANGEROUSLY.

Actual square of heating. 

All units of calefactors (including jumpers between chases, bores etc.) should be heated. If it is not present to expect a reliable operation of such calefactor is problematic and furthermore to ensure uniformity of heating of a production equipment.

Security of attachment of breedings.

Flexible leads and breedings of detachable joints should stand a stretching stress not less than 30 % of a rupture strength. If breeding at such load terminates or drawn down, it indicates a production low

level.

The breedings of a calefactor transiting through a metallic envelope should transit only through

isolators.

Acute beads in places of passage of wires through an envelope, should not be. If wires are simply bred through bores in metallic boxes, it indicates a production low level.

Rods (loose straps) of calefactors should ensure a hold-down tool of all work face of a calefactor 2 a product. 

If all work face nestles not to count on a reliable operation of a calefactor it is

impossible.

Amenity of mounting.

The easier the construction of a calefactor is built in heat uped machinery, the was more friend it to a user.

The most simple embodiment when 4 its installation secund access (mechanic and electrical mounting is required implements on the one hand). 

The price.

To purchase the reliable thermal radiator working in 3-5 times is more part than other under the same price - CORRECT SELECTION of the USER. 

The yardsticks resulted above, was possiblly, will help a user to select a safety and reliable thermal radiator 4 the machinery.