|
Overview / Design Principle:
This dual instrument controls and records two temperature variables on a single chart. It is ideal for temperature and humidity controlled applications such as growth chambers, smokehouses and kilns. The unit is made up of two switch mechanisms. UL and CSA listed. Flush or wall mount available (brackets supplied).
Operation:
The unit is a mechanical, recording controller that incorporates two independent control switching systems in a single case. To avoid interference, the two pens register a difference on one-twelth revolution of the chart, or a two hour differential on a 24 hour chart. Control points are indicated by a red setting pointer on the right hand mechanism, a green pointer on the left.
There are two control switches mounted on each mechanism, they are mounted one behind the other. First switch to be actuated on a termperature rise is the leaf-type switch. The second switch (a pin type for left mechanism and a leaf type for the right mechanism) is actuated when the recorded temperature exceeds the operation of the first switch. Temperature actuation points between teh two switches (differential) is adjustable from 0 to 5% of scale range, with tolerance on switch setting ± 1/2%, adjustment is made by set screws inside the instrument case.
|