Model Sim-12H Heated Sensor And Components; Connecting The Sensors - GE Optica Operator's Manual

Chapter 2. Installation

2.6.6 Model SIM-12H Heated Sensor and Components

The SIM-12H heated sensor module is suitable for measuring dew/frost points between –10°C and +85°C. It contains
precision heating, as well as cooling, capability. Three separate heaters are located in the sensor walls, 120 degrees
apart. Three temperature sensors measure the body temperature at those points, and three control circuits precisely
adjust the temperature of each heater. Any detected temperature gradient across the sensor cavity is immediately
eliminated, resulting in very even control. All three heaters are controlled by the temperature set by the front panel
selector knob. The sensor is a two-stage unit, providing 65°C of depression capability, and 60°C actual measurement
range.
2.6.6a Type SIM-HFT Heated Filter Module
The SIM-HFT heated filter module allows the sample gas to be purged of particulate contaminants prior to entering the
sensor. The incoming gas is first passed through a 90-micron prefilter, then a 15-micron final filter. All parts in contact
with the sample are heated to a constant 105°C, eliminating any possibility of condensation. The sintered filters are
easily removed for cleaning or replacing if required.
2.6.6b Type SIM-HFM Heated Flow Meter
The SIM-HFM heated flow meter module allows the sample gas flow rate to be both measured and controlled at a rate
that is optimum for the sensor. A metering valve mounted on the front panel allows control over a range of 0 to 2 ft
All parts in contact with the sample gas are heated to a constant 105°C, so that no condensation occurs. The flow meter
is normally mounted downstream from the heated sensor.
2.6.6c Type SIM-HSL Heated Sampling Line
The SIM-HSL heated sampling line is self-regulated at a temperature high enough to ensure that no condensation
occurs. The line is made of ¼-inch outside diameter PTFE, with stainless steel fittings.
2.6.6d Type SIM-MPL Mounting Plate
The SIM-MPL mounting plate is designed to accept one, two or three heated modules: the heated sensor, the heated
filter, and the heated flow meter. The mounting plate provides a convenient method of wall-mounting the entire heated
sampling system. When ordered with one or more modules, the factory performs all mounting, plumbing and wiring
work, thus providing a complete system ready for installation.

2.6.7 Connecting the Sensors

Dew point, temperature and pressure sensors provided by GE for the Optica monitor are pre-wired with connectors
installed. Plug these connectors into their corresponding sockets as shown in Figure 9 on page 11 for the benchtop unit,
or Figure 12 on page 13 for the wall-mount unit.
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Optica™ Operator's Manual