Viscotherm with Differential Pressure (DP) Transmitter:

• The viscotherm consists of a capillary tube connected to the discharge side of a gear pump driven by an electric motor.
• A DP transmitter measures the pressure difference in the capillary tube, which is directly proportional to the viscosity of the fuel oil.
• The fuel oil passes through a heater controlled by a steam valve. The valve adjusts the steam flow to maintain the desired fuel viscosity.
• A controller compares the measured viscosity from the DP transmitter to the set point and sends a signal to regulate the steam valve.

• As fuel flows through the viscotherm, the gear pump diverts a portion of the fuel through the capillary tube.
• The DP transmitter measures the pressure difference across the capillary tube.
• The DP transmitter sends the viscosity data to the controller.
• The controller compares the measured viscosity to the set point value.
• If the viscosity deviates from the desired level, the controller adjusts the steam valve to increase or decrease the steam flow to the fuel heater.
• Adjusting the steam flow changes the fuel temperature, directly impacting viscosity to maintain optimal levels.