Instruction manual

CS451/CS456 Submersible Pressure Transducer

when digital communications break down, resulting in either no response or

excessive SDI-12 retries and incorrect data due to noise problems. (Using

SDI-12 commands like aMC!, which adds a CRC check, can significantly

improve incorrect data issues.)

8.3 Measuring Multiple SDI-12 Sensors

Up to ten CS451/CS456 sensors or other SDI-12 sensors can be connected to a

single datalogger control port. Each SDI-12 device must have a unique SDI-12

address of 0 and 9, A to Z, or a to z. See Appendix D, SDI-12 Sensor Support

(p. D-1), for more information.

9. Maintenance

Campbell Scientific recommends that the CS451/CS456 be factory recalibrated

and checked every 24 months. Before a CS451/CS456 sensor is sent to

Campbell Scientific, the customer must get an RMA (returned material

authorization) number, and fill out the Declaration of Hazardous Material and

Decontamination form.

The CS451/CS456 has no user-serviceable parts. Cable can be damaged by

abrasion, rodents, sharp objects, twisting, crimping or crushing, and pulling.

Take care during installation and use to avoid cable damage. If a section of

cable is damaged, it is recommended that you send your sensor back to replace

the bale harness assembly.

Periodic evaluation of the desiccant is vital for keeping the vent tube dry. The

CS451/CS456 ships with the desiccant tube attached. To assess the

effectiveness of the desiccant, use one of the following:

x The desiccant in the tube changes color from blue to pink when the

drying power is lost.

x The Enclosure Accessory Humidity Indicator Card (pn 28878).

9.1 Every Visit

x Collect data.

x Visually inspect wiring and physical conditions.

x Check indicating desiccant or enclosure humidity indicator; service if

necessary.

x Check battery condition (inspect physical appearance and use a keyboard

display, PDA, or laptop to view the battery voltage).

x Check all sensor readings; adjust transducer offsets if necessary.

x Check recent data.

9.2 Every Two to Three Years or on a Rotating Schedule

x Send the CS451/CS456 in for inspection.