Teledyne 200AH Manuale Utente

 

The Zero/Span Valve option consists of a manifold of stainless steel valves plus drive electronics 
connected to the CPU. The Option consists of two variations. Option 50 has 2 - 2-way valves, 
1 3-way valve and operates in 3 modes: 

1.  Sample mode, all 3 valves off, sample gas flows through the sample port to the instrument. 

2.  Zero mode, sample-cal valve is energized to shut off sample flow, zero valve is energized to 

input zero gas. 

3.  Span mode, sample-cal valve is energized to shut off sample flow, span valve is energized to 

input low concentration range span gas. 

Option 52 consists of all of the features in Option 50 plus a second span valve to allow a low and 
high concentration of span gas. 

Figure 2-6 for valve location. Fittings on the rear panel are for two concentrations of span gas 
plus zero gas. (See Figure 2-2 and Figure 2-4) The valves are can be operated by several 
methods shown in Table 6-1. 

Note:  The Zero/Span Valves option cannot be included in an instrument that also includes an Oxygen 
Sensor. 

1. 

Front panel operation via 
CALS and CALZ buttons 

2. 

Automatic operation using 
AUTOCAL 

Setup and use of AUTOCAL is described in Table 6-2 and 
Section 7.2 

3. 

Remote operation using the 
RS-232 interface 

Setup described in Section 6.2 Operation of AUTOCAL 
described in Section 7.2 

4. 

Remote operation using 
external contact closures 

Section 7.5 - Automatic operation using external contact 
closures. Table 7-12 and Section 9.3.4.3 

 

Zero and span gas inlets should supply their respective gases in excess of the demand of the 
Analyzer. Supply and vent lines should be of sufficient length and diameter to prevent back 
diffusion and pressure effects. See Figure 2-4 for fitting location and tubing recommendations. 

Note that Zero/Span Valves cannot be included in an instrument that also includes the Oxygen 
sensor option.