Teledyne 402REU - Hydrocarbon analyzer - Manual (Page 21)

3-3 Teledyne Analytical Instruments
Total Hydrocarbon Analyzer Installation
lockwasher are put on the screw, the screw must be screwed into the 402R-
EU case firmly to assure that the lockwasher next to the case cuts throught
the paint on the case to the metal of the case. The other end of this wire
must be connected to an approved safety ground (protective ground).
After connecting this wire to the 402R-EU and before connecting this
wire to the safety ground, check that the resistance from this wire to the
case of the 402R-EU is less than 1.0 ohms. If the resistance is greater than
or equal to 1.0 ohm:
1. Remove the screw, lug and star washers,
2. Scrape away the paint on the case in that area,
3. Reconnect the screw, lug and star washers,
4. And recheck the resistance.
The ground pin on the IEC power connector and the protective earth
ground screw are both protective conductor terminals and functional earth
terminals. Both must be grounded for personel safety and for proper
functioning of the equipment. A lack of grounding will result in erratic
instrument performance.
3.1.2 3.1.2 3.1.2 3.1.2 3.1.2 Voltage Output Signal Voltage Output Signal Voltage Output Signal Voltage Output Signal Voltage Output Signal
The output signal is available at the terminal block on the rear of the
analyzer case (see the "Input-Output Diagram"). A 2-conductor shielded
cable must be used to interconnect the analyzer with an auxiliary indicating
and/or recording instrument. Connect the shield at the analyzer end only.
Connecting both ends of the shield can produce a ground loop and erratic
performance. Polarize the signal connections as shown on the "Input-
Output Diagram".
Auxiliary indicating and/or recording equipment must have an input
impedance of no less than 10K
Ω
. A self-balancing potentiometer is ideally
suited as an auxiliary indicator.
An isolated 4-20mA current output is also privided.
3.2 Gas Connections
The analyzer gas connection diagram identifies the various gas con-
nection points as to function and location. Figure 3-1 shows the gas con-
nection points for instruments with or without the optional gas selector