How To Unpack the 146 Instrument
Chapter Two: Installation
28
Order Code
Type Number
Card Slot 1
Card Slot 2
Card Slot 3
Card Slot 4
Card Slot 5
Display option
146C
B A C N M - X
Figure 5: Model Code
Model Code Explanation
Available Boards
Channel Boards
Function Boards
A = Capacitance Manometer
M = Control
B = Dual Pirani/Convection
N = Auxiliary Output
C = Cold Cathode
S = Binary Coded Decimal
D = Hot Cathode
O = No board installed (covered slot)
E = Dual Thermocouple
F = Mass Flow Controller
O = No board installed (covered slot)
Display Option
1 = 146 unit with a front panel display
2 = 146 displayless unit (without front panel display)
Notes
1. Four is the maximum number of channels for the instrument.
2. Channel numbers are determined by the sequence of channel boards. For example, a single
board installed in slot 1 becomes channel 1. If a dual channel board is installed in slot 2, it
occupies channels 2 and 3.
3. Only one Control board and one Auxiliary Output board can be installed in the instrument.
4. All unused slots must be specified as O (no board) within the model code.
5. If two Hot Cathode (HC) boards are installed into one unit, both HC boards MUST be set to
low power configuration. Otherwise, the 146 unit may exceed its temperature rating.
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