Float level measurement for a paper mill

Magnetic gauges for condensate

The two L21 gauges had connection centres of 900 and 590 mm and one-inch ASME Class 150 RF flanges. The drawings covered local indication, a 4–20 mA output with HART, and drain or vent fittings.

The L21/900 configuration had a 3.1 l measuring-chamber volume and a permissible temperature of 150 °C. The L21/590 had a 2.4 l volume and a permissible temperature of 100 °C. Both units were documented for a permissible pressure of 16 bar.

Immersion instruments and spare components

The two L11 instruments had a construction length of 800 mm, a measuring range of 500 mm and a two-inch ASME Class 150 RF top flange. The drawings specified mineral oil with a density of 850 kg/m³; one configuration had an LCD on the transmitter.

• Two additional indicators and two transmitters for each L21 configuration.
• One separate LCD display for the SP4 transmitter.
• Individual drawings for the main instruments and material and calibration documentation.

Factory pressure testing

The factory records dated 26 March 2024 confirm successful water tests lasting 30 minutes. The L21 gauges were tested at 24 bar and the L11 immersion instruments at 20 bar.

These tests covered the pressure-containing parts at the manufacturer’s works. Acceptance testing of the fittings before commissioning was a separate subsequent activity.