Rosemount 7D, Инструкция по эксплуатации

Страница: 32 / 54

I
NITIAL
S
TARTUP
20
December 2000 Rosemount Analytical 748221-L Model 7D Thermal Conductivity Analyzer
Note:
Before supplying electrical power to the analyzer, disconnect the red lead from
the bridge to TB1-1 or TB1-2 on the Master Board (depending on detector bridge
polarity). This action disconnects power to the bridge. To safeguard against
filament damage, this lead should remain disconnected until proper gas flow
has been established. Refer to drawing 654642.
After performing a leak check, start up the analyzer as follows:
1. Remove the connector from J2 on the Master Board (Figure 2-6). Verify that this
line goes to TB6, located at the lower left of the instrument (see Figure 1-2). If it
does not, make corrections using drawing 654642 as a reference.
2. Set regulators on the gas cylinders for a supply pressure of 10 to 50 psig f(69 to
345 kPa).
3. Provide a sample flow of 50 to 350 cc/minute through the analyzer. A rate of 250
cc/minute is recommended unless faster flow is desired to reduce sample transport
time.
4. If the thermal conductivity cell uses flowing reference gas, provide a reference flow
of 5 to 50 cc/minute.
5. Refer to drawing 654642 and Figure 2-6. Connect the cable from TB6 to J2 on
the Master Board to provide AC power to the Master Board. Reconnect the red
lead of TB1 (or TB2) to provide power to the detector. Apply power to the
analyzer. The filaments will now begin to heat. Verify proper flow of sample gas
and flowing reference gas, if used.
6. Allow the analyzer to warm-up for a minimum of six hours to ensure temperature
equilibrium.
Note:
If ambient temperature is below 60
°°°°
F (15.6
°°°°
C), or if the temperature will go below
60
°°°°
F (15.6
°°°°
C) within the next six hours, allow a minimum of 12 hours for the
instrument to stabilize.
Startup is now complete; the analyzer is ready for calibration per Section 3.4.