Hach TU5200, User Manual, Page: 30 / 40

Option Description
Verify after Cal. Sets the instrument to start a verification immediately after the instrument is calibrated.
When set to on, the verification standard is measured immediately after a calibration is
done. Default: ON.
Acceptance
Range Sets the maximum difference permitted between the recorded value of the verification
standard and the measured value of the verification standard during verification.
Unit —
Sets the acceptance range for verification to a percentage (1 to 99%) or an NTU value
(0.015 to 100.00 NTU). Options: % or NTU (or mNTU).
Verification
Reminder Sets the time interval between calibration verifications. The display will show a reminder
when a verification is due. Options: OFF(default), 1 day, 7 days, 30 days or 90 days.
When a verification is done, the verification time is set to zero.
Do a calibration verification
Do a calibration verification to make sure that the instrument is still calibrated as necessary.
1. Log in to the instrument as follows:
• Put an operator RFID tag in front of the RFID module or
• Push
Login . Select the applicable operator ID, then push Select .
2. Push Verification .
3. Clean the verification standard vial with a no-lint cloth to remove contamination.
Keep contamination off the glass. Refer to
Prevent vial contamination on page 18.
4. Dry the external surfaces of the vial with a no-lint cloth. Make sure to dry the bottom of the vial.
5. Carefully invert the vial three times. Refer to Figure 6 on page 27.
6. Put the vial in the vial compartment.
7. Push Start .
8. Confirm the value shown or enter the exact turbidity value of the standard. Push Read .
9. When the measurement is complete, remove the vial.
The verification is recorded to the verification log.
10. To show the verification log, push Options > Verification Log . Refer to Show the recorded data
on page 24 for more options.
11. To send the verification data to external devices that are connected to the instrument, push
Options > Send Data . Refer to Show the recorded data on page 24 for more options.
Maintenance
C A U T I O N
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
C A U T I O N
Chemical exposure hazard. Obey laboratory safety procedures and wear all of the personal protective
equipment appropriate to the chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
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