Serving the industry since 1952

Instrumentation

Every package boiler solution requires a set of instrumentation to guarantee safe, efficient, and reliable operation. Specifically, instrumentation to measure fluid flow rates, levels, pressures, and temperatures are needed. Sensory equipment for combustion safeguards are also included in most package boiler systems. Each instrument typically includes a sensing element in addition to a transmitter to process and forward an electrical signal containing a reading.

Flow Measurement
To measure the flow rate of a fluid, a Flow Meter must be placed in series with the piping system containing the fluid to be measured. The Flow Meter is typically connected electrically to a Flow Transmitter that interprets the readings from the Flow Meter and sends a data signal to the main control system where it is processed and used to change other system variables. The most common type of device used for flow measurement in boiler applications is the differential pressure flow meter that utilizes an orifice plate. To measure airflow in the ductwork a pitot static tube anemometer is often used.
Level Indication
To maintain the proper flow rate and quality of outgoing steam and incoming feedwater in a boiler system, it is essential to know the instantaneous water level in the steam drum. To accurately measure the water level, a number of level indicators may be used, including but not limited to an Electrolev Column, Guided Wave Radar, and a Capacitive Level Indicator. Each of these devices, in conjunction with a level transmitter, can send the drum level to the main control system so other system variables can be changed. It is also customary to include an analog water column level gauge on the drum for visual verification of the water level.
Transmitters
Transmitters are electrical devices that interpret the reading from a sensor, convert it to a common format electrical signal and then transmit the signal to a Programmable Logic Controller. The most common transmitter format used for boiler applications is the 4-20 mA signal that linearly correlates an electrical current value between four and twenty milliamps to a range of pre-determined minimum and maximum values for the measured state variable. Transmitters are required on all instrumentation that is interactive with the master control system.