Hardware Description: Basic System
The Main Board
Thermo Fisher Scientific
AutoPILOT PRO Flow Computer User Guide 2-5
The main board provides three analog inputs for single low-power
transducers (0–5 Vdc maximum range). Other transducers with voltage
output ranges such as 0.8–3.2 V or 1–5 V units may be used with software
scaling provided the 0–5 V limits are not exceeded. Use of 4–20 mA
current loop transmitters is not recommended for units powered from
small battery sources.
The analog inputs have been evaluated as non-incendive field circuits for
use with the following analog transmitters (differential pressure, static
pressure, and temperature):
Druck static pressure transmitter, Model PDCR143-8003 (25–3000
psi range)
Rosemount
static pressure transmitter, Model 3051C Low Power
(3626 psi maximum)
Rosemount
differential pressure transmitter, Model 2024 (2000 psi
maximum)
Rosemount
differential pressure transmitter, Model 3051C Low
Power (3626 psi maximum)
Thermo Scientific RTD temperature transmitter, Model 465A
The transmitters may be connected to the flow computer using standard
cabling and optional flexible conduit. All transmitters are wired to TB1
through TB3 on the main board or to analog input channels 1 through 16
on the optional analog input expansion / terminal boards. Maximum cable
length between the flow computer and each transmitter is 25 feet.
Each local analog input provides transmitter power (XPWR) at a nominal
+12 V that power cycles with the unit, a transmitter signal input (IN), and
a transmitter power return (AGND). The analog inputs on the main board
are identified in the following table.
Table 2–2. Analog inputs on the main board
Input
In
AGND
XPWR
AI1
TB1-1
TB1-2
TB1-3
AI2
TB2-1
TB2-2
TB2-3
AI3
TB3-1
TB3-2
TB3-3
Transducer Inputs
