Metek 920, Operator'S Manual With Essential Health And Safety Requirements

Page: 126 / 278

4-18 | Model 920 Multi-Gas Analyzer
Temperature Zones (b2, b1)
b2 b1 Number of zones Zone Number
0 0 None None
0 1 2 1, 4
1 0 3 1, 2, 4
1 1 4 1, 2, 3, 4
Standard Bench Type Code:
2 = Motorized Bench
The Temperature Zone code defines the number of temperature zones used by the ana -
lyzer, where ‘n’ = 0, 2, 4, 6, or 32. The definition for each bit is:
0 = No temperature control
2 = 2 temperature zones (1, 4)
4 = 3 temperature zones (1, 2, 4)
6 = 4 temperature zones (1, 2, 3, 4)
32 = Temperature zone 3 (heating logic, heater plate)
The code is the decimal equivalent of an 8-bit binary number, which defines the bench type
in regard to the temperature control parameters.
The temperature zones are:
Zone 1 = Sample Line
Zone 2 = Vent Line (or SCU, if used)
Zone 3 = TZone3 – Spare
Zone 4 = Oven Temperature
Filter Position Assignment (b4, b3)
b4 b3 Lamp 1 Lamp 2
0 0 1-3-5 4-6-2
0 1 3-5 4-6-1-2
1 0 1-3-4-5 6-2
The Filter Position code defines the filter sequence of which ultraviolet light passes through
each filter. The definition for each bit is:
0 = 1-3-5, 4-6-2 filter sequence
8 = 3-5, 4-6-1-2 filter sequence
16 = 1-3-4-5, 6-2 filter sequence
24 = motorless bench
Temperature Zone 3 (b5)
b5
Temp Zone3
0 Cooling Logic, SKO
32 Heating Logic, Heater