21
ENG
+0300046IE - rel. 1.2 - 14.01.2021
5. TECHNICAL INFORMATION
5.1 Electrical specifications
Category Specifications
Signals to central
controller
Current analogue output Normal operation: 4 to 20 mA
When exceeding the lower measurement limit: 3.8 mA
When exceeding the upper measurement limit: 20.5 mA
Device fault: ≤ 1.2 mA
Analogue interface fault: > 21 mA
Offline mode / Maintenance signal / Warm-up: steady 3 mA signal
Voltage analogue output 0 to 5 V; 1 to 5 V; 0 to 10 V; 2 to 10 V (selectable)
During a fault , the 1 to 5 V and 2 to 10 V outputs are at 0 V.
Modbus RTU over RS485 Baud rate: 9,600 or 19,200 (selectable)
Start bits: 1
Data bits: 8
Parity: none, odd, even (selectable)
Stop bits: 1 or 2 (selectable)
Retry time: 500 ms
End of message: 3.5 characters
Power supply and relay Operating voltage 19.5 to 28.5 Vdc; 24 Vac ± 20%, 50/60 Hz
Peak current 1.5 A
Operating current, max. 4 W, 170 mA at 24 Vdc
Transformer Minimum power: 5 VA
Rated relay power 3 SPDT
1 A at 24 Vac/Vdc, resistive load
Wiring Power supply 16 to 28 AWG. With 24 to 28 AWG wire, do not exceed a maximum length of 60 metres
Analogue signals and relays 16-28 AWG
Modbus network Shielded 3-wire cable, twisted pair + earth reference, characteristic impedance 120 Ω, 16 to 24 AWG, maximum
length 300 metres
Cable gland M20, cable outside diameter 10-14 mm
M16, cable outside diameter 4-8 mm
Tab. 5.a
5.2 Mechanical and environmental
specifications
Dimensions Enclosure size (W×H×D) (approx.) Built-in: 168x158x81 mm
Remote, main enclosure: 168x158x70 mm
Remote, sensor enclosure: 116x136x67 mm
Weight (approx.) Built-in: 643 g
Remote: 732 g
Operating temperature from -40 to 50 °C
Environmental conditions Storage temperature from -40 to 50 °C
Humidity from 5 to 90% RH, non-condensing
Pressure From 800 to 1,100 mbars
Altitude 3,050 m above sea level
Enclosure protection rating IP66
Tab. 5.b
5.3 Sensitive element
Operating life and calibration requirements
Category Semiconductor (SC) Infrared (IR) Electrochemical
(EC)
Recommended
maintenance
interval
6 months after commis-
sioning, subsequently
every 12 months
12 months. 12 months.
Typical sensor
operating life
4-6 years 5-7 years 2 years
Tab. 5.c
WARNING: the semiconductor sensitive elements must be
checked after exposure to significant concentrations of gas, which may
shorten sensor life and/or reduce its sensitivity.
Response range and resolution
MDL is the lowest detected level of gas concentration. Values below
the MDL are displayed as zero. Values below zero or above the range
generate negative or positive saturation conditions, respectively. If the
gas level is below the negative concentration limit, the sensor signals
a fault.
Sensor and gas
technology
Full-scale
range
MDL Display
resolution
Negative gas
concentration
limit
Unit
SC, refrigerants 0-1000 50 1 -100 ppm
SC, R290 0-2500 250 1 -500 ppm
EC, R717( NH3) 0-100 5 1 10 ppm
IR, CO
2
gas 0-10000 500 50 -1000 ppm
Tab. 5.d
Alarm set points
All alarms must have a threshold greater than or equal to the lower limit.
The high alarm set point must be higher than the low alarm set point. All
alarms must have a threshold less than or equal to the full-scale range.
Sensor and gas
technology
Lower limit Default low
alarm
Default high
alarm
Unit
SC, refrigerants 150 150 500 ppm
SC, R290 400 800 2000 ppm
EC, R717( NH3) 15 50 80 ppm
IR, CO
2
gas 1500 1500 5000 ppm
Tab. 5.e
Temperature compensation
The device adopts active temperature compensation for semiconductor
sensors. Infrared sensitive elements self-adjust for temperature.
The temperature compensation error is defined at the calibration
concentration.
Sensor technology Error
IR, CO
2
gas 10% FS
SC, refrigerants 20% FS
SC, 1234ZE/R450A 30% FS
EC, R717 (NH3) 15% FS
Tab. 5.f
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