Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 15)

Total Hydrocarbon Analyzer
Teledyne Analytical Instruments xv
Always purge the entire system before performing
any maintenance and always leak check the system
after removing any tubing or fittings on the sample
system. See the procedures for purging and leak
checking this instrument on the following pages.
If toxic gases or other hazardous materials are
introduced into the sample system, the same
precautions regarding leak checking and purging
apply to the sample lines and sample supply or
delivery lines.
WARNING: ELECTRICAL SHOCK HAZARD. WITH THE
EXCEPTION OF OPENING THE DOOR AND
ADJUSTING THE PRESSURE REGULATORS, FLOW
CONTROLLER, OR OBSERVING THE PRESSURE
GAUGES AND THE FLOWMETER, ONLY
AUTHORIZED AND SUITABLY TRAINED
PERSONNEL SHOULD PERFORM WORK INSIDE OF
THE INSTRUMENT. COMPONENTS WITHIN THE
COVER ON THE INSIDE OF THE DOOR, INSIDE THE
ISOTHERMAL CHAMBER (SAMPLE SYSTEM), AND
ON THE ELECTROMETER-AMPLIFIER PC BOARD
CONTAIN DANGEROUSLY HIGH VOLTAGE
SUFFICIENT TO CAUSE SERIOUS INJURY OR
DEATH.
There are the following three types of inaccessible
shock hazards within the 4020:
1. Line voltages and line related voltages such as
115 VAC which exists within the 230 VAC version
as well. These voltages stop when the 4020 is
turned off and the mains (line) cord is removed
from the instrument.
2. The sensor anode supply voltage (approximately
250 VDC). This voltage exists on the Flame
Guard, anode power supply, PCB, the
motherboard, and the anode/igniter terminals on
the sensor. THIS VOLTAGE WILL REMAIN
HAZARDOUS FOR MANY MINUTES AFTER THE
MODEL 4020 HAS BEEN TURNED OFF!