Baking & Snack - June 2018 - 98
The oil needs to be clean and evenly distributed throughout
the fryer to get an even, fully fried and great-tasting donut.
A large heating area
ensures oil reaches the
quickly and then
WP Bakery USA
In a larger fryer, Mr. Weekes suggested thermal oil
heating offers the most efficient, accurate and gentle
method, which saves the oil from degradation. This way,
oil is warmed in a heat exchanger outside of the fryer,
allowing for the largest heating area. "This gives the system sufficient time to heat the oil gently and provides extremely constant temperatures in the fryer," he said.
After heating, maintaining temperature and oil levels
are critical to the process. WP Bakery Group uses sensors to keep an eye on both the temperature and level
of the oil.
"The oil level must remain constant to ensure that the
products are all fried evenly and uniformly," Mr. Weekes
said. "We use capacitive level sensors to constantly check
the oil level in the fryer." These accurate sensors are not
affected by heat or steam. "This allows us to react immediately, topping up the frying from oil in a holding tank,
when the level goes down due to oil being absorbed by
the product," she said.
The company's fryers also have three sensors at critical
positions, which allows operators to track the oil temperature throughout in real time. One sensor is placed
in the infeed or the coldest area. Others are placed a
third and two-thirds of the way along the fryer length
and ensure the temperature remains consistent.
Belshaw Adamatic uses a closed loop proportional-integral-derivative (PID) device in its gas and electric fryers to prevent temperature swings as the heat is turned
on and off. In the gas fryers, the PID controls the gas input rate to the fryer. In the electric fryers, the PID works
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98 Baking & Snack June 2018 / www.bakingandsnack.com