Mettler Toledo M400/2(X)H Especificaciones descargar pdf (Pagina 59)

Transmitter M400/2(X)H, M400G/2XH 59

Printed in Switzerland 30 031 683

The conditions for alarms are:

1. There is a power failure or power cycling

2. The software watchdog performs a reset

3. Rg is out of tolerance – for example, broken measuring electrode (only for pH; pH/pNa Rg

diagnostics detect both pH and pNa membrane glasses)

4. Rr is out of tolerance – for example, coated or depleted reference electrode (only for pH sen-

sors; except pH/pNa)

5. If the conductivity sensor is on air (for example in an empty pipe) (only for resistive Con-

ductivity sensors)

6. If the conductivity sensor has a short cut (only for resistive conductivity sensors)

7. If no sensor is connected on channel B (only for ISM sensors)

8. If the conductivity sensor is on air (for example in an empty pipe) (only for ISM Conductivity

sensors)

9. Cell constant (multiplier) is out of tolerance, i.e. has changed too much compared to the

value thru the factory calibration (only for ISM conductivity sensors)

10. Electrolyte in the membrane body reaches such a low level that the connection between

cathode and reference is disturbed, an immediate action must be taken e.g. exchange and

filling the electrolyte.

For 1 and 2 the alarm indicator will be turned off when the alarm message is cleared. It will re-

appear if the power is constantly cycling or if the watchdog is repeatedly resetting the system.

Only for pH sensors

For 3 and 4 the alarm indicator will go off if the message is cleared and the sensor has been re-

placed or repaired so that the Rg and Rr values are within specification. If the Rg or Rr message

is cleared and Rg or Rr is still out of tolerance then the alarm will stay on and the message will

reappear. The Rg and Rr alarm can be turned off by going into this menu and setting Rg diag-

nostics and / or Rr diagnostics to No. The message can then be cleared and the alarm indicator

will be off even though Rg or Rr is out of tolerance.

Each alarm OC can be configured in either a Normal or Inverted state. In addition, a Delay for

the activation can be set. For more information, refer to Section 8.4 “Setpoints”.

Pressing the [ENTER] key again will bring up the Save Changes dialog. Selecting No will dis-

card the entered values, selecting Yes will make the entered values the current ones.

Note: There are additional alarms, which will be indicated in the display. See therefore in

chapter 14 “Troubleshooting” the different warning- and alarm lists.

8.5.2 Clean

Configure the OC to be used for the cleaning cycle.

The default value is OC 1.

The cleaning interval can be set from 0.000 to 999.9 hours. Setting it to 0 turns the clean cycle

off. The cleaning time can be 0 to 9999 seconds and must be smaller than the cleaning

interval.

Select the desired OC state: Normal or Inverted.

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Mettler Toledo M400/2(X)H Especificaciones Pagina 59