Model 520 HT UCA
D01157216
Revision A, October 2015
7
2
Safety
Safe laboratory practices and procedures should be observed while operating and
maintaining the Model 520. Follow the instructions provided to avoid personal
injuries or damage to the equipment.
Always wear appropriate personal protective equipment (PPE) when operating or
maintaining the Consistometer.
2.1
Safe Pressurization
This Consistometer has pressurized air, water, and hydraulic lines that present a
hazard if not depressurized before maintenance or disassembly.
The hydraulic diaphragm pump and the pressure relief valve require compressed
air. Before working on any of these devices or connected air lines, shut off the
compressed air supply to the machine, and carefully relieve air pressure from the
machine.
2.2
Safe Heating
Before opening the pressure chamber, use the cooling system to lower the
temperature to at least 120°F (49°C). The machine uses domestic water as coolant.
Shut off the domestic water supply before servicing.
NEVER operate the heater on an empty chamber. The heater element will quickly
overheat and fail. To prevent smoke and possible fire, always fill the chamber and
pressurize before heating.
2.3
Safe Electrical Operation
Disconnect the power cable before attempting any electrical or mechanical
maintenance. Be aware that after the power switch is turned off, the electrical
terminals inside the panel will remain electrically energized.
Refer to the electrical schematic before performing any maintenance or
troubleshooting.
Always disconnect the power cable before attempting any repair.
