Teledyne Sample Chamber Heating Circuit, M102E/M501 TRS, Theory Of Operation, Sample Air

THEORY OF OPERATION	M102E/M501 TRS
	(Addendum to M101E Manual - P/N 04740 Rev A)

9.4.1.1. Sample Chamber

The main electronic components of the sample chamber are the reference detector(see Section

10.2.2of the M101E Manual - P/N 04740 Rev A); the UV Lamp (see Section 10.2.1 of the M101E Manual - P/N 04740 Rev A) and its electronically operated shutter (see Section 9.2.1 of this addendum); and the sample chamber heating circuit,

UV Source Lamp

Shutter Housing

UV Source Lens &

Housing

PMT Lens &

Sample Air Housing

Outlet

O-Ring O-Ring

Seal Seal

Shutter Assy		Sample Air
(hidden from view)		Inlet
Sample Chamber		Reference
Heater
		Detector
Sample Chamber
Sample Chamber		O-Ring
Temperature Sensor
		Seal
	Sample Chamber	Light Trap
	Heater

Figure 9-3: M102E Sample Chamber

9.4.1.2. Sample Chamber Heating Circuit

In order to reduce temperature effects, the sample chamber is maintained at a constant 50°C, just above the high end of the instrument’s operation temperature range. Two AC heaters, one embedded into the top of the sample chamber, the other embedded directly below the reference detector’s light trap, provide the heat source. These heaters operate off of the instrument’s main AC power and are controlled by the CPU through a power relay on the relay board. A thermistor, also embedded in the bottom of the sample chamber, reports the cell’s temperature to the CPU through the thermistor interface circuitry of the motherboard.

48 05514 Rev A1