MessKonzept FTC320 User Manual

Page 22 of 47
6.3 Instrument Setup
6.3.1 Display Unit
0.30
[%] H2/N2
Unit -> Vol%
T90 Response
------------
------------
Unit -> ppm
------------
T90 Response
------------
Diagnosis
Instr. Setup
Output Setup
Expert Setup
Figure 6.4: changing the displayed unit for gas concentrations.
The first item of the instrument setup menu allows selection of the display unit. Pressing <ENTER>
alternates the unit between ppm and Vol.%. Quit the menu with the <UP> key. The value of parameter
P56 (see Section 6.5.1) sets the number of digits after the decimals point between 1 and 4 when the
display unit is set to Vol.%. The resolution in ppm is always 1 ppm. All internal calculations of the
FTC320 are in ppm. Values retrieved through the RS-232 interface will always be in ppm with 1ppm
resolution.
6.3.2 Response Time Setup
Unit -> Vol%
T90 Response
------------
------------
T90 Response
set: 1.00000
new: 1.00000
[s] ESC/OK
0.30
[%] H2/N2
Diagnosis
Instr. Setup
Output Setup
Expert Setup
Figure 6.5: T90 response time setup
In the menu “T90 Response“ the response time of the exponential filter can be adjusted. The filter
reduces the influence of fast variations of the raw signal (signal noise smoothing). The numerical value
for the T90 response time is given in the unit of seconds. A range between 0s and 100s is permitted
for this value, reasonable values lie between 0.5s to 10s. You can change the numerical value by navi-
gating through the digit position using the <RIGHT> key and changing it using the <UP> key. Confirm
by pressing the <UP> key until OK is selected. The changed value can be discarded by selecting ESC
instead. Setting “T90 Response“ to 0.0 turns the exponential filter off.
The true response time is influenced by the gas exchange time which depends on the
pneumatic installation and the flow rate of measuring gas. A gas flow of 80l/h leads to a
gas exchange time of under 0.5s measured from the gas inlet of the device.
Note that the response time in your process depends greatly on the upstream volume
before the FTC320. Shorter and/or thinner tubing will benefit response times.
File name:
FTC320Ex Operating Manual_1.09KD201009MPO3V04.pdf

MessKonzept FTC320 Specifications

General

Brand	MessKonzept
Model	FTC320
Category	Measuring Instruments
Language	English