Instruction manual

7.0 STARTUP SM425 INSTRUCTION MANUAL
7.0 STARTUP
This section describes the minimum operating requirements for the SM425. Detiails include supplying
power to the converter, analog output confirmation, and manual calibration.
For system tuning by the HART communicator, refer to IM11M12A01-51E "HART Communication
Protocol ".
7.1 Checking Piping and Wiring Connections
Verify the piping and wiring connections have been properly completed in accordance with Section 0,
“Piping,” and Section 0, “Wiring.”
7.2 Checking Valve Setup
Set up valves and associated components used in the analyzer system as follows:
1. Fully close the stop valve in the detector’s calibration gas inlet if it is used.
2. If instrument air is used as the reference gas, adjust the air-set secondary pressure for an air
pressure equaling the process gas pressure plus approximately 50 kPa (150 kPa if check valve is
used, maximum pressure rating is 300 kPa). Turn the reference-gas flow setting valve in the flow
setting unit to obtain a flow of 800 to 1000 ml/min. (Turning the valve shaft counterclockwise
increases the rate of flow. If the valve has a lock nut, loosen the lock nut before turning the valve
shaft.) After completing the valve setup, be sure to tighten the lock nut.
The calibration-gas flow setting is described later. Fully close the needle valve in the flow setting unit.
42500001 REV A 101