Specifications

115
COFFEE MAKER
10.8 FUNCTION OF COFFEE MAKER : A coffee maker is a small heating appliance designed
for brewing coffee from ground coffee beans without having to boil water in a separate container.
10.9 TYPES : The different types of coffee makers are
i) Percolator style coffee maker
ii) Drip-brew or a drip coffee maker
iii) Electric or a automatic drip coffee maker
iv) Vacuum coffee maker
v) Siphon Coffee maker and
vi) Pour-over or water displacement drip coffee maker
In this chapter, we will see the Percolator type and Automatic drip coffee makers.
Percolator Type: A coffee percolator is a type of pot that is used to brew coffee. The word
percolator is originated from the word “percolate” that means to allow water to pass through the
coffee grounds for extracting coffee that give its color, taste and aroma. Today, in the market,
one can find different types of percolators, depending on the source of heat.
Electric Coffee Percolator is the most common type. It is much more popular than its
counterparts, as it gives a more consistent brew by stopping automatically when the coffee is
done. It then switches to a warming mode when completed. An electric percolator has a built in
heating element that can be cordlessly used.
Construction: Percolator type coffee maker consists of a pot with a small chamber at the
bottom which is placed closest to the heat source. A vertical tube leads from this chamber to the
top of the percolator. Just below the upper end of this tube is a perforated chamber.
In the base of the coffee maker will find the resistive heating element (a wire coil that becomes
hot when electricity flows through it), which comes in direct contact with the bottom of the
warming plate. It is coated in thick, white grease that conducts heat, spreading it out evenly. The
resistive heating element is controlled by the on/off switch and, while it’s on, managed by sensors.
A simple percolator type is shown in Fig. 10.8
Leaking tank 1. Leakage around thermostat.
2. Leakage around heating unit
flange.
3. Leakage at plumbing
connections.
4. Tank leak.
Check all points for possible
leakage. Replace fibre
washers and use Teflon tapes
to seal the leaks.