FISCHER FT90 - Auxiliary Energy; Operating Conditions

FISCHER Mess- und Regeltechnik GmbH Technical data | 7
BA_EN_FT90 97/108
Modbus RTU interface
interface RS 485
Report Modbus RTU
Modbus specification Application Protocol Specification
V1.1b3 (April 26, 2012)
Address 1 … 247
Baud rate 2400 … 115200 Baud
Parity Even, uneven, parity
Stopbits 1…2
7.6 Auxiliary energy
NOTICE!Only a CE-compliant mains adapter with a slow 200 mA fuse may
be used in the power supply circuit for ATEX devices.
Nominal voltage 24 V AC/DC
Admissible operating voltage U
b
19.2 to 28.8 V AC/DC
Power consumption Typ. 2W (VA)
Max. 3W (VA)
7.7 Operating conditions
Standard ATEX
Ambient temperature range -20 to +70 °C -20 to +60 °C
Medium temperature range -20 to +70 °C -20 to +60 °C
Storage temperature range -20 to +70 °C -20 to +70 °C
Ingress Protection Code IP65 IP65
EMC EN 61326-1:2013
EN 61326-2-3:2013
ATEX EN IEC 60079-0:2018
EN 60079-15:2010
EN 60079-31
RoHS EN IEC 63000:2018
CAUTION!Avoid contact between the temperature/humidity sensor and
the following chemicals and substances:
• Contaminated air/air that is not oil-free (e.g. jets of air from an air gun)
• Volatile chemicals such as solvents and organic (carbonated) compounds
• Ketene, acetone, ethanol, isopropyl alcohol, toluene and so on are known
for causing a drift in the measured humidity value. In most cases, this is not
reversible. Please note that these chemicals are integral parts of epoxides,
adhesives, glues etc. and can degas during baking/curing.
• Acids and bases such as HCl, H2SO4, HNO3, and NH3 can affect the
sensor irreversibly, and should be avoided. Ozone in high concentrations or
H2O2 has the same effect and should also be avoided.
• The sensor must not be allowed to come into contact with cleaning agents
(e.g. alcohol and detergents). The application of cleaning agents to the
sensor can cause the measured value to drift or the sensor to fail com-
pletely.