Waring PC50 Especificações descarregar pdf (Página 33)

3. Operation MI 611-211 – October 2005

following individually: GLASS, LEAKAGE, LOWSLOPE, PREAMP, ATCSHORT, ATC

OPEN

, COAT, AGING, 4-20 RNG, COMP RNG, and MEAS RNG. Each of these is discussed

below. A typical approach is to initially select ENABLE ALLDIAGS and to DISABLE select mes-

sages later when you find out that you do not require them. Further, when you have messages on

your display, you may

CLEAR all of the messages or CLEAR specific messages. This feature then

disables the reporting of those messages for an hour to allow time for corrective maintenance.

NOTE

Any sensor diagnostic that has been set to ENABLE causes the output to go to the

fail-safe DC mA value when the diagnostic condition exists. Therefore, if sensor

diagnostics are enabled, it is important to set the fail-safe DC mA value to an

acceptable safe output level (see “Config Output” on page 18). If you do not want the

output to respond to some or all of the sensor diagnostics, then you must set the

selected diagnostics to DISABLE.

GLASS

This message reports a problem in the resistance of a glass electrode in the probe. Resistance of a

glass electrode is checked versus solution ground. An error message appears if the resistance is less

than user set limit. Besides clearing, enabling, and disabling the message, you can LIMIT the

message to resistances below a set value. The LIMIT value may be set between 0 and 1100 kΩ in

increments of 100 kΩ. The default value is 500 kΩ. You may also specify a CUTOFF Temperature

above which this feature is disabled. CUTOFF T can be set between 0 and 100 (°C or °F). The

default value is 50. The resistance of a glass bulb decreases (roughly is halved) for every 10°C

increase in temperature.

NOTE

Disable this message for ORP and ISE measurement.

LEAKAGE

This message reports a problem of liquid leakage into the sensor. The diagnostics checks the

resistance between solution ground and the RTD. An error message appears if the resistance is

anything but infinite. The message may be enabled, disabled, or cleared.

LOWSLOPE

This message reports a problem usually associated with an aging glass electrode. An error message

appears after a 2-point calibration in buffer solutions when the Nernst slope of the sensor

becomes less than the user set limit. The limit may be set between 0 and 100 percent. The default

value is 80. The message may be enabled, disabled, or cleared.

NOTE

Disable this message for ORP and ISE measurement.

PREAMP

This message reports a failed preamplifier. The diagnostics checks the preamplifier by monitoring

the voltage coming out of it. An error message appears when the voltage is greater than 2 volts.

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Waring PC50 Especificações Página 33