Delta NANOTRACE DF-745 Instruction Manual download pdf (Page 23)

Installation, Start Up and Shut Down DF-745 19

4.2 Analyzer Start Up

It is important to note that, if equipped with automatic gas valves, the moisture cell is

isolated from gas flow while the analyzer is off power.

Open the door and turn on the power using the main power switch inside the analyzer. See

Figure 2. The pump, if equipped, should turn on (see page 17) and the analyzer will

undergo a series of Diagnostic Procedures while the various startup screens are displayed.

Next, the Delta F Corporation logo is briefly displayed and then the data display appears

with the “Warming Up” screen flashing. The warm up process takes approximately six to

ninety minutes after which the display will look similar to Figure 8 (values shown are only

representative).

During the Warm Up process the gas valves (if equipped) can be opened and gas flow

started. See the section on Gas Pressure and Flow Settings on page 20 for important

information on the gas delivery system and setting proper pressures and flow rates.

NOTE

During the warm up period all analog and digital outputs are held to an

artificial 0.011ppb reading to avoid the reporting of false readings.

Figure 8: Data Display Screen

4.2.1 Gas Delivery System

The gas delivery system as shown in Figure 9 is designed to deliver a gas flow rate of 2

liters per minute to the moisture cell while maintaining the highest standards of gas purity

and delivery for ultra-trace analysis. Features include a single inlet line and flow meter for

the gas sample, and optional bypass loop to maintain constant purging, and essentially dead-

leg free delivery.

The connections at the rear of the gas delivery system include a ¼” VCR swivel connection

for the process inlet, a ¼” compression outlet for the moisture cell, an optional pneumatic

gas connection (1/8” compression), and an optional ¼” compression outlet for the bypass

loop. Also on the rear of the gas delivery system, if equipped, are a sample gas regulator to

adjust the internal sample pressure and a bypass flow meter.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 97 98

No comments

Delta NANOTRACE DF-745 Instruction Manual Page 23