Red Seal Instrumentation and Control Technician case studies
Red Seal Instrumentation and Control Technician · Put your knowledge to work in context.
The Red Seal Instrumentation and Control Technician certification is a Canadian interprovincial trade credential. It recognizes journeypersons who can install, calibrate, troubleshoot and maintain the instruments and control loops that keep industrial processes safe and efficient - pressure, level, flow and temperature transmitters, control valves, analyzers, PLC and DCS interfaces, and the documentation that ties them together. The Red Seal Instrumentation and Control Technician case studies are 5 cases and about 3,292 words.
1Wet-Leg Level Transmitter Reads High After Service
A closed condensate receiver at a paper mill is measured by a DP transmitter calibrated 0–2.0 m. The lower tap is 0.4 m above the vessel bottom and the upper tap is 2.4 m above the bottom, so the level span is 2.0 m.
748 words, about 4 min2Cavitating Boiler Feedwater Control Valve
A 100 mm single-seat globe valve controls 45 m3/h of boiler feedwater from a deaerator to a boiler. Upstream pressure is 1,200 kPa(g) at 160°C; downstream pressure is 700 kPa(g).
674 words, about 3 min3Loop-Powered Transmitter Starves After Indicator Addition
A 24 VDC loop-powered pressure transmitter is wired through a 300 Ω intrinsic-safety barrier, a 250 Ω PLC analog input, and 25 Ω total cable resistance. The transmitter nameplate states a minimum terminal voltage of 12 V at 20 mA, and the HART communicator requires at least 250 Ω in the loop.
633 words, about 3 min4pH Analyzer Drift and Agitator-Induced Offset
A pH loop controls caustic addition to a neutralization tank. The analyzer is a two-wire transmitter with a glass electrode and a separate reference, connected through a junction box 30 m from the tank.
615 words, about 3 min5Surge Tank Level Loop Cycling After Pump Change
A surge tank level is controlled by a PID loop that modulates a 100 mm butterfly valve on the outlet. The transmitter range is 0–4.0 m and the setpoint is 2.0 m.
622 words, about 3 min