Certifications
MAN0984_Iss 4_01/19
Touchpoint Plus
Pt. No. 3011M5001
129
Technical Handbook
12.3.2
Special Conditions for Use When Used for Measurement of Toxic Gases or Oxygen
1)
Refer to certificate
PFG 17 G 002 X
2)
When use as EN45544-2 apparatus, Touchpoint Plus is suitable for use with transmitters where the output at
the limit value is between 4.96mA and 12 mA. Refer to EN45544-1 Annex A for future information.
3)
Only 4-20 mA output and relay output have been considered as safety functions. Other outputs (e.g. RS485
Modbus RTU, TCP/IP Modbus/HTTP) shall NOT be considered as safety functions.
4)
When using 4-20 mA transmitters, pay particular attention to the followings:
-
The specifications of the 4-20 mA interface
-
Behaviour with currents less than 4 mA
-
Behaviour with currents in excess of 20 mA
5)
Configure the alarms of all input channels as latching.
6)
Configure relay outputs for safety-related switching operations in such a way that they cannot be reset while
the alarm condition is present.
7)
Time delayed relays should not be used for safety related purposes. If their use is unavoidable, the relay delay
time shall be set to the minimum value which is feasible for the required operation. Take the maximum
possible rate of increase of gas concentration into account when determining the relay delay time.
8)
Transmission errors between modules cause a fault after 5 s at the latest.
9)
Perform the test routines for display, LED and buzzer in weekly intervals.
10) Set the parameters "Inhibit Output Level", "Fault Output Level" and "Warning Output Level" of mA outputs to
values outside the range 4 mA to 20 mA so that the output of such a current can be unambiguously
distinguished from a measured value. Avoid settings between 3.5 mA und 20.5 mA.
11) Measurement of oxygen:
-
Set the parameter "resolution" to 0.1 %Vol or to a smaller value.
-
Do not set the parameter "Lower deadband" to a value below -0.5 %Vol.
-
Do not set the parameter "Upper deadband" to a value above 0.5 %Vol.
12) Operation according to EN 45544-2:
-
Touchpoint Plus is suitable for use with 4-20 mA transmitters where the output at the limit value is
between 4.96 mA and 12 mA.
-
The lower limit of measurement represents 0.6 % of the upper limit of measurement (resolution set
to 2 % of the limit value). It decreases when the resolution is set to smaller values.
-
Set the parameter "Upper deadband" to the lower limit of measurement (calculated for the
combination of Touchpoint Plus and the connected transmitter) or to a smaller value.
-
Do not set both parameters "Lower deadband" and "Gas Under range" to values below -(2 times the
lower limit of measurement).
-
Do not set the parameter "Gas Under range" below -10 % of the upper limit of measurement or -(4
times the lower limit of measurement). Use the value which is closer to zero.
13) Operation according to EN 45544-3:
-
Set the parameter "resolution" to 1 % of the upper limit of measurement or to a smaller value.
-
Set the parameter "Upper deadband" to 5 % of the upper limit of measurement or to a smaller value.
-
Do not set the parameter "Gas Under range" to a value below -10 % of the upper limit of
measurement.
14) One of either RLY1 or RLY2 in main board shall be configured to System inhibit Relay.
12.3.3
Special Conditions for software update.
User is responsible for verification of all settings of Touchpoint Plus after successful update of software (e.g.
Firmware, EEPROM and Sensor Catalogue Data). It is highly recommended to verify all settings are correct after
software update. F
update.
