Mettler Toledo M400 Especificações descarregar pdf (Página 79)

Transmitter M400 79

Printed in Switzerland 52 121 378

If any of these criteria are set to Yes and the conditions for an alarm are given, the flashing sym-

bol a will be shown in the display, an alarm message will be recorded (see also chapter Mes-

sages; PATH: Info/Messages) and the selected relay will be activated. Furthermore an alarm can

be indicated by the current output if this has been parameterized (see chapter 8.3 “Analog out-

puts”; PATH: Menu/Configure/Analog Outputs)

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 and dis-

solved carbon dioxide sensors)

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

sors)

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 temperature is out of range, stray light is too high (e.g. because a glass fiber is bro-

ken) or the shaft has been removed (see also chapter 11.1 “Diagnostics”;

PATH: Menu/Service/Diagnostics/O

optical) (only for optical sensors)

9. If the signal or the temperature value is out of range (see also chapter 11.1 “Diagnostics”;

PATH: Menu/Service/Diagnostics/O

optical) (only for optical sensors)

10. If an hardware error has been detected (see also chapter 11.1 “Diagnostics”;

PATH: Menu/Service/Diagnostics/O

optical). (Only for optical sensors)

11. If the sensors is faulty e. g. through broken wires or a short cut (only for inductive conduc-

tivity sensors)

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

sensors)

13. 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)

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

replaced or repaired so that the Rg and Rr values are within specification. If the Rg or Rr mes-

sage 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 di-

agnostics 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 relay 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”.

If power failure is turned on, only inverted state is possible and cannot be changed.

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

discard 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 chap-

ter 17 “Troubleshooting” the different warning- and alarm lists.

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