NH4D Preventative Maintenance Partnership Scope of Work

Document ID

Document ID TE11567


Version 1.0


Status Published

Published Date

Published Date 07/17/2019
NH4D Preventative Maintenance Partnership Scope of Work

NH4D Preventative Maintenance Partnership


Your Hach NH4D Preventative Maintenance Partnership (PMP) provides preventative maintenance performed by a Hach Field Service Technician. In addition, the Hach Technical Support Team is available to assist in troubleshooting your specific instrument. Please have your contract#, Model# & Serial# available when you call.

During the pre-scheduled site visit, your Hach Field Service Technician will complete:


Verification of Instrument performance/Maintenance

  • Perform limited instrument cleaning.
  • Review and evaluate user programmed parameters.
  • Verify all instrument connections (including initial evaluation of the network topography).
  • Evaluate all instrument alarm and warning conditions (internal to your Hach instrument)
  • Verify instrument operating voltages.
  • Verify/Calibrate NH4D sensor per manual
  • Replace sensor cartridge (additional cartridges will be an additional charge)
  • Verify and calibrate 4-20ma recorder outputs for NH4D sensor
  • Verify software and update as necessary


Reporting/Certificate of Performance

  • Provide Hach Field Service Report with complete documentation of service performed and measurements/readings.
  • Issue Certificate of Instrument Performance for each instrument that successfully passes final testing.



  • Provide basic end user training on general instrument operation and maintenance (Advance notice required by the customer).

*Please see standard terms and conditions for limitations.

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