NI SCXI-1100 Voltage module USES tutorial

NI SCXI-1100 Voltage module USES tutorial

Leave the connected sensors to stabilise for a suitable period as specified in the sensor manual. Adjust the sensor head current of catalytic sensors as described in Chapter 7 Section 7 to the required value as indicated in the sensor operating instructions. Using the procedures for the type of sensors being used, follow the zero and 1st span operational guide in Chapter 7 Sections 8 and 10, and calibrate each channel.

MAINTENANCE 

To ensure that the system functions correctly, maintenance should be carried out on a regular basis as dictated by the site regulations and instructions for the type of sensor being used. For installations in the EU, EN 50073 should be followed. The system should be maintained in a clean condition and kept free from dust and grease. The following checks should be made annually, or more frequently if required by local regulations or procedures: (1) Check and if necessary tighten all terminations to the DC Input Card and Interface/Relay Cards. (2) Check that the Engineering Card power on ( ) green LED is illuminated and all other LEDs are extinguished. (3) Check that each channel card display indicates a normal reading with no error messages. (4) Select each channel card in turn and check that channels sensor signal reading and, if a catalytic sensor is connected, the sensor bridge current. (5) With the Engineering Key fitted to the Engineering Card, select each channel card in turn and enter the alarms test function.

Check the alarm levels

alarm LED operation, alarm relay operation and display operation for each channel. (7) Check the operation of all fault and inhibit relays. (8) Check that, with the sensor in a gas free atmosphere, the display indicates zero. If appropriate adjust the zero reading using the ZERO function. Note: For oxygen applications the zero function should only be operated in an oxygen free atmosphere. Under normal atmosphere conditions the display should indicate 21% ± 0.5% v/v, this can be adjusted by using the SPAN function. The System 57 control cards and engineering cards carry out continual self checking of the integrity of the hardware, software and sensor operation. In the event of a problem, and depending on the type of problem, the control card will indicate either an error message on the LCD display or will operate the fault LED and relay output.

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