Dräger Polytron 8000 Serie Instrucciones De Uso página 32

en | Interface settings
11.10.5 Switching triggering mode on or off
This function allows storing values from a certain value on.
1. Select Settings > Data logger > Data logger > Trigger
on/off and confirm.
2. Select On or Off and confirm.
On
Off
11.10.6 Setting trigger value
This function defines the trigger threshold to store a value.The
trigger value is defined as a percentage of the full scale
deflection.
Example: A trigger value of 2 % at full scale deflection of 500
ppm will only store values if they deviate by 10 ppm (relative
to the previously stored value).
1. Select Settings > Data logger > Datalogr. on/off Trigger
value and confirm.
2. Set the trigger value and confirm.
11.10.7 Setting stack/roll function
1. Select Settings > Data logger > Data logger >
Stack/Roll and confirm.
2. Select Stack or Roll and confirm.
Roll
Stack
11.10.8 Clearing data logger
This function deletes the stored data.
1. Select Settings > Data logger >Clear data logger and
confirm.
2. To clear the data-logger, select Confirm and confirm with
[OK].
12 Interface settings
12.1 4-20mA interface
The current output of the instrument during normal operation
is between 4 and 20 mA and is proportional to the detected
gas concentration.
Polytron 8xx0 uses different current values to indicate various
modes of operation. The factory default settings are user
adjustable for application specific requirements. This follows
the NAMUR recommendation NE43.
32
Measurements are stored if
they exceed a threshold
beyond the trigger value (rel-
ative to the last stored value).
Measurements within the
sampling time are stored.
Once the capacity of the data
logger is reached, the old
data are overwritten by new
values.
Once the capacity of the data
logger is reached, no more
data can be stored. The
instrument issues a warning.
12.1.1 Full scale deflection
®
Polytron 8100 EC, 87x0 IR and 8200 CAT LC only
Some sensors offer an adjustable full scale deflection to limit
the measuring range for the 4-20 mA interface.
The full scale deflection (FSD) sets an endpoint within the
measuring range of the sensor. If the gas concentration
reaches this endpoint, the 4-20mA interface transmits 20mA.
Example: Required range 0 to 500 ppm CO (e.g. part number
6809605 default 300 ppm, range min/max = 50/1000
ppm).Select full scale deflection as 500 ppm. The analog
output will be linear between 4 mA = 0 ppm and 20 mA = 500
ppm.
12.1.2 Setting fault current
This function defines the current for the fault signal.
1. Select Settings > Communication > Analog interface
>Fault current and confirm.
2. Select the line for editing the current and confirm.
3. Set the current and confirm.
 The setting for the Fault current is displayed.
4. Select Confirm and confirm with [OK].
12.1.3 Information regarding the warning signal
To transmit a warning signal via the analog interface, it must
be switched on.
The warning signal alternates between the warning current
and the measurement current.
– Warning current (interval T2)
– Measurement current (interval T1-T2)
Time intervals and the warning current are configurable.
[mA]
20
4
3
T
T
1
12.1.4 Switching the warning signal on or off
1. Select Settings > Communication > Analog interface >
Warning and confirm.
2. Select Enable or Disable and confirm.
12.1.5 Setting warning interval
1. Select Settings > Communication > Analog interface >
Warning interval and confirm.
2. Set times for warning intervals T1 and T2 and confirm.
12.1.6 Setting warning current
1. Select Settings > Communication > Analog interface >
Warning current and confirm.
2. Set the current and confirm with [OK].
Instructions for use
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Dräger Polytron 8000 Series