YOKOGAWA GC8000 K9409ZA Valve Seat

YOKOGAWA  GC8000 K9409ZA  Valve Seat

Procedure to start up the isothermal oven by controlling the supply pressureof protective gas

(1) Supply a protective gas (instrument air) and a carrier gas.

(2) Supply power to the protection system (flameproof enclosure).

(3) After purging the electrical circuit unit is completed (21±3 minutes), power is supplied to the

electrical circuit unit. Check that the operation panel (human machine interface: HMI) starts.

(4) If any of the low internal pressure alarms (No. 112 to 114) appears on the operation panel(HMI) and power is not supplied to the isothermal oven, supply power to the isothermal ovenas follows.

(5) Remove the cover from the pressure controller and check the setting pressure of theregulator for supplying protective gas (purging air) (in the case of multiple isothermal ovens,repeat this step for each oven).

(6) Set the pressure of the regulator to 350 – 450 kPa, and check that the low internal pressurealarm is deactivated.

(7) After purging each isothermal oven is completed (9±2.5 minutes), power is supplied to eachoven. Turn on the heater for the oven.

(8) After the temperature of the isothermal oven becomes stable, set the pressure of theregulator back to the value checked at step (5).

(9) Check that low internal pressure alarms are not issued, and then put the cover of thepressure controller back in place.