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1.2.2 Input/Output Capability
Available inputs and outputs include the following:
•
4-wire Resistance Temperature Detector (RTD) input
•
4–20 mA and 0–5 VDC Pressure Sensor inputs
•
two simultaneous analog outputs, each with 4–20 mA and 0–5 VDC capability
•
two independent alarm relays (Form C, 5 Amp)
•
serial communications port
•
Ethernet 10BaseT (on VGA Optica only)
The Optica uses the GE Measurement & Control patented Programmable Automatic Contaminant Error Reduction
(PACER) system for automated self-cleaning and optics rebalancing.
Detailed specifications for the Optica are given in Appendix A.
1.3 The System
1.3.1 System Components
A complete Optica system consists of the following items:
•
Electronic monitor
•
Dew point sensor
•
Interconnecting sensor cable
•
AC line cord
•
Certification that the unit is traceable to the National Institute
of Standards and Technology (Certificate of Conformance)
1.3.2 System Planning
The Optica can be used for a wide variety of measurement applications, including the measurement of dew points of
gasses that are at pressures that exceed the measurement range of GE's sensors. In this situation be sure to check the
section Process Pressure on page 32 for installation planning.
1.4 Sensors
The Optica can be configured with a chilled-mirror dew point sensor. The specific sensor is chosen according to the
expected dew point range and the environment in which the dew point is to be determined. In addition, the Optica can
be configured with a temperature and/or pressure sensor. GE provides the following sensors for various applications:
Optica™ Operator's Manual
•
Temperature sensor
(optional)
•
Pressure sensor (optional)
•
Maintenance kit
•
User's Manual
Chapter 1. Features and Capabilities
3
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