Analyzer components – Yokogawa In-Situ Gas Analyzer TDLS200 User Manual
Page 27
4-8
IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<4. ANALYZER COMPONENTS>
4.5 Detect Unit
Detect or Electronics Housing
The Enclosure is die cast copper free aluminum grade AL Si 12 alloy (A413.0) with a powder coat exterior finish.
The copper free aluminum alloy is particularly resistant to salt atmospheres, sulfur gases and galvanic corrosion. A
removable cover (lid) incorporates a weather tight gasket seal and four captive fastening screws (stainless steel). The
external dimensions are approx 7” W x 7” H x 4” D (180mm x 180mm x 100mm).
The environmental protection rating is considered IP65 (EN 60529) or NEMA 4X.
The cable entry located on the bottom face of the enclosure. It is typically a ¾” Myers hub that has a ¾” NPT
female thread. It has a ground lug to facilitate the grounding of cable shields to the analyzer chassis.
Detector Circuit Board
Detector Circuit Board main function is to convert detector photocurrent into voltage and send it to be digitized.
LEDs are incorporated to provide simple diagnostic of available power. The board has a temperature sensing chip/
circuit that monitors the ambient temperature inside the detect electronics enclosure. The sensor is located on the
top edge of the detect board to ensure the maximum temperature reading is monitored.
The board is medium size (approx. 4” H x 6” W) printed circuit board that mounts inside the enclosure. The field
terminations are located along the lower edge of the board via pluggable terminal block. All components and
devices on the board are designed for extended temperature and low drift operation.
Detect unit
Process Interface
Detect
Electronic
Housing
Detect
Assembly
Detect Electronics Housing
• Detector Circuit Board
Detector Housing and Detector Module
• Detector and focusing lens assembly
• Detector module designed to be field replaceable
and purged to prevent ambient air ingress.
• Housed in a stainless steel body with O-rings
seals, attached to the detect electronics housing.
Figure 12 - Detect Unit