2-8 Hardware Options and Installation
XL™ Series
Figure 2-6 Analog Input Section
2.2.8 Analog Input Section
The first seven connections on the twenty pin terminal block are used for analog input functions.
This includes four analog inputs, two analog grounds and one +5.00 volt excitation connection.
2.2.8.1 Analog Input Channels
There are four analog input channels labeled Vin1 to Vin4. The standard input range for all
channels is 0 to 5 volts, and the optional range is 0 to 500 millivolts. The 500 millivolt range is
used for sensors that produce millivolt outputs. For example, some solar radiation sensors have a
full scale output of less than 500 millivolts. This type of sensor should be used with the 500
millivolt range. Channels 1 and 2 can also be used in a differential mode. The analog inputs use
a 20 bit analog to digital converter.
2.2.8.2 Analog Grounds
There are two analog ground connection points.
In order to preserve signal integrity, it is
important to use the analog grounds only for sensors connected to the analog section of the
XL™.
The current flowing through an analog sensor is relatively small and normally very stable.
This provides stable voltages produced by these sensors. If a digital sensor has its ground
connection tied into the analog ground, the currents from the digital sensor will flow through the
analog circuitry causing voltage level shifts and noise based on digital switching. There should
be sufficient digital ground connection points for the digital sensors.
Summary of Contents for H-350XL
Page 1: ...XL Series Models H 350XL H 500XL H 510XL H 522 H 522 Plus Owner s Manual ...
Page 30: ...2 16 Hardware Options and Installation XL Series ...
Page 42: ...3 12 Using The Built In Keypad Display XL Series ...
Page 46: ...4 4 PC Menu Interface Operation XL Series ...
Page 58: ...5 12 Miscellaneous System Setup XL Series ...
Page 66: ...6 8 Serial Port Options XL Series ...
Page 74: ...7 8 System Configuration Files XL Series ...
Page 84: ...8 10 System Status Menus Options XL Series ...
Page 88: ...9 4 Scanning Options XL Series ...
Page 156: ...15 12 Logging Options XL Series ...
Page 198: ...16 42 Operation with the GOES Radio XL Series ...
Page 216: ...19 6 Alarm Call Out XL Series ...
Page 234: ...21 8 Operation with the H 355 Smart Gas System XL Series ...
Page 246: ...22 12 Functions XL Series ...