Instruction manual

7.0 STARTUP SM425 INSTRUCTION MANUAL
• Conducting an open-close check for contact output 4 generates an Error 1 or Error 2. This is because
the built-in heater power of the detector, which is connected to contact output 4, is turned off during the
above check. If these errors occur, reset the equipment or cycle power to restart (refer to Section 0,
“Reset”).
7.11.2 Testing Calibration Output Contacts
The calibration contacts are used for solenoid valve drive signals for the SM425CAL Automatic
Calibration Unit. When using the SM425CAL Automatic Calibration Unit, use the calibration contact
output to check the wiring connections and solenoid valve operation of the Automatic Calibration Unit.
1. Select the “contact check” display. See Section 1.43.1.
2. Select “Calibration contacts”. The display shown in Figure 7-20 appears.
3. Cycle the zero-gas and the span-gas contacts. This will check the solenoid valve and wiring
connections.
Figure 7-20 Calibration Contact Check Display
“Open” and “Closed” displayed on the Calibration contact display indicate actions of drive contacts. The
valve is opened (gas flows) when the contact is in the closed state.
7.11.3 Testing Input Contacts
1. Select the “contact check” display screen. See Section 1.43.1.
2. Select “input contact”. The display screen shown in Figure 7-21 appears. This display screen
indicates the state of the input contacts but does not control them. Cycle the input source(s) to
check the wiring connections.
42500001 REV A 113