48 Electronic Balancing Tool EBT720/EBT721 and ProHood PH720/PH721
Calibration
TSI recommends an annual calibration for the instrument. For a nominal fee, we will calibrate the unit
and return it to you with a certificate of calibration and NIST traceability. This “annual checkup” assures
you of consistently accurate readings. To calibrate the instrument, please ship the complete package that
includes the meter, the base, the manifold and any fabrics used. Everything should be packed carefully
within the carrying case and then inside a shipping box. The original shipping box is preferred. Before
sending your instrument for calibration or repair, obtain a Return Material Authorization (RMA) number
by visiting our website at http://rma.tsi.com
or contacting customer service. When obtaining an RMA
number, you will also learn the cost of service or calibration and receive shipping instructions.
Tables 5 and 6 list the symptoms, possible causes, and recommended solutions for common problems
encountered with the instrument. If your symptom is not listed, or if none of the solutions solves your
problem, please contact the factory.
Table 4: Troubleshooting the Instrument
Symptom Possible Causes Corrective Action
No display Unit not turned on.
Low or dead batteries.
Dirty battery contacts.
AC adapter not connected.
Press I/O key.
Replace the batteries.
Clean the battery contacts.
“ ”
flashing on display
Low battery charge.
Replace or recharge the batteries.
Clean the battery contacts.
flashing on display
The pressure is too high to measure.
This same display is shown if
measuring velocity or flow and the
pressure at that velocity is too high.
The maximum pressure is shown
on the specifications page.
“8888”
flashing on display
The temperature is too high to
measure.
The maximum temperature is
shown on the specifications page.
Table 5 lists the possible error codes and their meanings. All error codes are preceded by ‘ERR.’
Table 5: Error Codes
Error Code Possible Causes Corrective Action
10 The AC adapter voltage is too low.
The NiMH batteries will not recharge fully
with low AC adapter voltage.
Use correct AC adapter.
11 The AC adapter voltage is too high.
The NiMH batteries will not fast-charge
with high AC adapter voltage.
Use correct AC adapter.
12 Model number checksum error. Return to factory.
13 Serial number checksum error. Return to factory.
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