LSI LASTEM Alpha-Log - Page 111

Alpha-Log – User manual
LSI LASTEM SRL
INSTUM_03388
Page 111 / 116
Impulsive /
frequency inputs on
external optional
module
MDMMB1110 /
MDMMB1110.1
Inputs number
4
Function
4 frequency inputs/counters/On/off logic state (0 ÷ 3 Vdc):
• 2 for optoelectronic sensors, max 10 kHz
• 2 inputs max 1 kHz
Uncertainty
3 Hz @ 5 kHz
Protection
Transient voltage suppressor 600 W, <10 µs
Impulsive /
frequency inputs
Inputs number
2
Inputs mode
• 2 two pluviometers single reed relays
• 1 double reed relay pluviometer
• 2 frequency inputs from two optoelectronic anemometers
• 1 relay reed from one rain gauge and 1 frequency input from
optoelectronic anemometer
Powering
Limited to 1 mA per reed relay
Input type
Open collector with 3.3 V pullup resistance (positive input)
Max input frequency
• 480 kHz for impulsive inputs
• 10 kHz for frequency inputs
Linearization
YES (with intensity correction formula for Class A pluviometers -
UNI EN 17277:2020)
Protections
Against reed relay pulses train
Tension (> 5V) 400 W peak pulse power capability at 10/1000 µs
waveform
Repetition rate (duty cycle): 0.01 %. IEC-61000-4-2 ESD 30 kV (air),
30 kV (contact)
ESD protections of IEC 61000-4-2 data line
EFT protections of IEC 61000-4-4 data line
Input (relative
humidity
temperature sensor)
Input
UART-TTL (from sensor DMA672.1/.4)
Range
Temperature: -40 ÷ 70 °C
Relative Humidity: 0 ÷ 100 %
Dew Point: -40 ÷ 70 °C
Resolution
Temperature: 0.1 °C
Relative Humidity: 0 ÷ 100 %
Dew Point: 0.1 °C
Pt100 input
(temperature sensor)
Input
Pt100 (3 wires)
Range
-40 ÷ 70 °C
Resolution
0.1 °C
Accuracy
±0.25 °C
Voltage input
Input
Voltage
Range
1 ÷ 2000 mV
Resolution
NA
Accuracy
NA