Teledyne 9110AH - Nitrogen oxides analyzer - Manual (Page 161)

TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
9-45
9.3.4.4 4-20 mA Current Output
There are two types of current loop outputs available for the M9110AH, non-isolated (standard
equipment) and isolated (optional). These outputs may be used in place of the analog voltage
signals that appear at the rear panel connector. See Section 9.3.3.1 for setup and calibration
procedure.
Non-isolated 4-20 mA or 0-20 mA Output
Non-isolated 4-20 mA is recommended for applications requiring a current loop and the current
loop receiver has an isolated input stage. It can also be used when there a potential difference
does not exist between the ground connections of the two instruments.
Recommended load (R
l
) = 100 - 600 (Max. 600 )
V/F analog output voltage setting = +10V Full Scale
Default Setting = 4-20 mA
To convert from 4-20 mA to 0-20 mA output, refer to Status/Temp Schematic 01087 sheet 2,
and the procedure in Section 9.3.3.1.
Isolated 4-20 mA or 0-20 mA Option
This option is recommended where maximum isolation from ground loops is required.
Specifications include up to 1500 V rms common mode voltage isolation (transformer coupled
input to output galvanic isolation) and 240 Vrms normal mode voltage output protection.
Recommended load (R
l
) = 200 - 1000 (Max. 1200 )
V/F analog output voltage setting = +5V Full Scale
Default Setting = 4-20 mA
To convert from 4-20 mA to 0-20 mA output, refer to Status/Temp Schematic in the Appendix,
and the procedure in Section 9.3.3.1.
9.3.5 Power Supply Module
The Power Supply Module consists of several subassemblies described in Table 9-9.