Teledyne T200, Руководство по эксплуатации, Страница: 85 / 425

Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual Setup Mode Menus
83
The T200 solves this problem by allowing the user to select a reporting range for the
analog outputs that only includes that portion of the physical range that covers the
specific application. This increases the reliability and accuracy of the analyzer by
avoiding additional gain-amplification circuitry.
Note Only the reporting range of the analog outputs is scaled.
Both the DAS values stored in the CPU’s memory and the concentration values
reported on the front panel are unaffected by the settings chosen for the
reporting range(s) of the instrument.
5.4.2.1. ANALOG OUTPUT RANGES FOR NO
X
, NO AND NO
2
CONCENTRATION
The analyzer has three active analog output signals related to NO
x
, NO and NO
2
concentration, accessible through a connector on the rear panel.
NO
2
Concentration
ANALOG OUT
A1 A2 A3 A4
+ - + - + - + -
Test Channel
or O
2
concentration
(if optional O
2
sensor
is installed)
NO Concentration NO
x
Concentration
Figure 5-1: Analog Output Connector Pin Out
The A1 , A2 and A3 channels output a signal proportional to the NO
x
, NO and NO
2
concentrations of the sample gas, respectively. The T200 can be set so that these outputs
operate in one of three modes: single range mode, independent range mode, or automatic
range mode (Section 5.4.3).
Additionally, the signal levels of A1, A2 and A3 outputs can be:

Configured full scale outputs of: 0 - 0.1 VDC; 0 – 1 VDC; 0 – 5 VDC or; 0 – 10 VDC

Equipped with optional 0-20 mADC current loop drivers (see Section 3.3.1.4 ) and
configured for any current output within that range analog output (e.g. 0-20 mA, 2-
20 mA, 4-20 mA, etc.)
Together these two sets of parameters allow the user a great deal of flexibility in how the
instrument reports NOx , NO and NO
2
concentration to external devices. For example,
using the IND mode the following configuration could be created:
A1 OUTPUT: NO
x
Output Signal = 4 – 20 mA representing 0-1000 ppb concentration
values
06858E DCN7057