Aquametrix 2200P pH Analyzer/Controller User Manual - Manual (Page 26)

Model 2200P Page 24
8.1.1 The 2200P has diagnostic features which alerts the operator to invalid entries and
memory loss. Invalid entries are indicated by the flashing of the appropriate menu
LED. The flashing will commence after RUN is pressed and will continue until the
errors are corrected. Memory loss is indicated by the flashing of TEST and by the
alarm relay if enabled by DIP Switch No. 5 of Bank S1. See Section 4.7.3.
8.2 Invalid Calibration
4.8.3 Invalid calibration will be indicated in the following instances:
• When the difference between the two calibration buffers is less than 10% of the
measuring scale span. To correct, enter the menu and calibrate with more
appropriate buffers. See Section 5.2.
• When the input is out of range. This could occur if you had attempted to calibrate
with a buffer, which was outside the range of the instrument.
8.3 Invalid Output
8.3.1
Invalid output will be indicated if the expanded range is less than 10% of full scale.
To correct, refer to Section 5.4.
8.4 Invalid Alarm Points
8.4.1 Invalid Alarm will be indicated if the Low Alarm is set higher than the High Alarm.
To correct, refer to Section 5.10 and 5.11.
8.5 Invalid Setpoint
8.5.1 The relay off setting must be lower than the relay on if you are controlling rising pH,
and higher than the relay on if you are controlling falling pH. If you have not made
these settings correctly, invalid entry will be indicated by a flashing LED. To
correct, refer to Section 5.5 and 5.8.
9.0 TROUBLESHOOTING AND SERVICE
9.1 Calibration / Display Problem
9.1.1 If the problem is one of inability to calibrate or the display does not appear to match
the input, try the RESET feature. See Section 6.4. In rare cases, the ESCAPE
feature might be used. See Section 9.3.
9.2 Isolate the cause
9.2.1 When a measurement problem occurs, the first step is to try to isolate the cause. If
the 2200P is powered, go through the menu and check your settings. A convenient
way to do this is to call TEST. See Section 5.12
9.2.2 If your 2200P appears dead or intermittent, check the breaker, make sure that the
instrument is set up for the available line voltage and make sure the line voltage is
actually available at the terminals. Now measure that sufficient voltage is available
at all times; it should be 98 Vac to 132 Vac or 187 Vac to 243 Vac respectively.
Shut line power off, making sure it is off. CAUTION: Power to the relays may be
supplied from a separate source, shut it off too. Check and if necessary replace the
internal 0.25A fuse. Push the connector of the ribbon cable firmly into its socket. If