METIS M311 / M322 / H311 / H322 (17-pin)
Pyrometer Parameters / Settings
23
6.8
Temperature Sub Range
The temperature range can be scaled down in order to adapt it to specific measurement conditions
(minimum range 51°C), e.g. to configure the automatic clear function of the peak picker (see
). A
modified temperature range also can be set for the analog outputs to increase the resolution even fur-
ther.
6.9
Customize Analog Output
The analog outputs can be set independently of the temperature sub range. They can be set to range
limits between 0 and 6000°C or °F, even if the pyrometer does not cover these ranges.
Limit the analog output:
if the analog
output is set smaller than the pyrometer’s temperature range,
the resolution of the analog output is increased even further.
Enlarge the analog output:
Entering a larger range as the pyrometer’s range will scale the output.
The output at the beginning of
temperature range is 0 or4 ma, at the end of the pyrometer’s tempera-
ture range the current output is that corresponding to the enlarged temperature range.
Example:
A pyrometer with temperature range 750
–2500°C
should be adapted to the range 600
–3000°C. In the range of
600
–750°C, the pyrometer does not measure the tempera-
ture in the software shows UNDER. At the analog output
(e.g. set to 0-20 mA) the output current is 0 mA as long as
750°C is reached, then 1.25 mA will be applied to the output.
From 2500°C a consistently current is applied that would be
present at a 600
–3000°C device at 2500°C.
6.10 Analog Output
The 2 analog outputs can be set separately:
Depending on the connected devices to
0
–20 mA
or
4
–20 mA
Analog output 1
always provides the measured temperature (always the temperature, displayed in
the control window in
SensorTools
Control window
).
(
Note:
With older firmware versions, the same settings are possible as at analog output 2. A firmware
update to the latest version eliminates this possibility and prevents, that the output of analog output 1
is accidentally different to the displayed temperature signal. Firmware update see section
Analog Output 2
can be assigned to provide different signals:
-
2-color temperature:
2-color temperature output
-
Temperature channel 1: Channel 1 temperature output
-
Temperature channel 2: Channel 2 temperature output
-
Device temperature:
Internal device temperature output
-
Control output:
Manipulated variable of the PID controller
-
No output
No signal is on the output
6.10.1 Test Current
On the device itself and via software a test current can be set to the output. Via software this current is
adjustable, on the pyrometer the current is fixed to 10 mA (at 0
–20 mA) or 12 mA (at 4–20 mA).
6.10.2 Upscale-Burnout
In case of sudden shadowing of the pyrometer’s visual field, the output current is set to 20 mA instead
of usually the lowest.
Disabled Upscale-burnout
(standard)
:
The analog output at sudden shadowing of the pyrometer’s
view field is the lowest current (0 or 4 mA).
With
enabled upscale-burnout
function,
the analog output at sudden shadowing of the pyrometer’s
view field is set to the maximum current of 20 mA. This can be desirable, for example, in a furnace
monitoring when the controller otherwise would recognize a cold oven and heat up fully and possibly
burn out the oven.
0 mA
20 mA
600 750 2500 3000°C
1,25 mA
16,66 mA