Humidity / temperature transducer for air ducts, high precision with calibration certificate

RKFT(H)/A


  • % r.H., g/m³, g/kg, DP °C

  • accuracy ±2% r.H.

  • -30...+70°C, -20...+80°C, 0...+50°C, 0...+100°C

  • output 0-10 V, 4-20 mA, changer

  • heating function for condensation protection

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Commodity Group 5

SKU Humidity Temperature Output Version Price € net / gross * Availability Qty Action
RKFT(H)/A-UR 0-100% r.H. -20...+80°C 2 x 0-10 V, changer without display
Excl. Tax: €265.30 Incl. Tax: €307.75
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RKFT(H)/A-UD 0-100% r.H. -20...+80°C 2 x 0-10 V with display
Excl. Tax: €307.75 Incl. Tax: €356.99
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RKFT(H)/A-I 0-100% r.H. -20...+80°C 2 x 4-20 mA without display
Excl. Tax: €254.69 Incl. Tax: €295.44
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RKFT(H)/A-URD 0-100% r.H. -20...+80°C 2 x 0-10 V, changer with display
Excl. Tax: €318.36 Incl. Tax: €369.30
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RKFT(H)/A-IR 0-100% r.H. -20...+80°C 2 x 4-20 mA, changer without display
Excl. Tax: €265.30 Incl. Tax: €307.75
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RKFT(H)/A-ID 0-100% r.H. -20...+80°C 2 x 4-20 mA with display
Excl. Tax: €307.75 Incl. Tax: €356.99
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RKFT(H)/A-IRD 0-100% r.H. -20...+80°C 2 x 4-20 mA, changer with display
Excl. Tax: €318.36 Incl. Tax: €369.30
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RKFT(H)/A-U 0-100% r.H. -20...+80°C 2 x 0-10 V without display
Excl. Tax: €254.69 Incl. Tax: €295.44
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Measurement range r.H. 0-100% r.H.
Measurement range abs. humidity 0-50 g/m³, 0-80 g/m³ (calculated) selectable by DIP switch
Measurement range air fuel ratio 0-50 g/kg, 0-80 g/kg (calculated) selectable by DIP switch
Measurement range dew point -20...+50°C DP, -20...+80°C DP, 0...+50°C DP (calculated) selectable by DIP switch
Measurement range temp. -20...+80°C
Scales -30...+70°C, -20...+80°C, 0...+50°C, 0...+100°C selectable by DIP switch
Accuracy humidity ±2% r.H. (30-70% r.H., else ±3% r.H. at 20°C)
Accuracy temperature ±0,3 K (10...40°C, else ±0,5 K),
Temperature dependency ±0,02% r.H. / K (voltage output), ±0,04% r.H. / K (current version), ±0,05°C / 10 K (voltage version), ±0,07°C / 10 K (current output)
Long term stability ±1%/year
Sensor Combined electronic humidity and temperature sensor
Sensor protection screwable stainless steel sinter filter, condensation protection by heating function in the range of 95...99% r.H.
Flow rate < 2 m/s
Supply voltage analog 0-10 V 24 V AC/DC (±5%)
Supply voltage analog 4-20 mA 15...36 V DC (Ubmin = 15 V + RLoad*0,02A)
Current consumption at 0-10 V typ. 10 mA, 30 mA peak current consumption for 50 ms at switching moment at option relay
Current consumption at 4-20 mA max. 20 mA / output, 40 mA peak current consumption for 50 ms at switching moment at option relay
Analogue output 0-10 V 3-wire connection, load current < 0,1 mA
Analogue output 4-20 mA 2-wire connection (transmitter), max. RLoad(Ohm) = (+Ub - 15 V) / 0,02 A
Alarm output 1 x potential-free change-over contact, 48 V, 1 A
Switching Hysteresis Relay 2% of the selected scaling (without display), 0,5...5% of the selected scaling adjustable (with display)
Electrical connection screw terminals max. 1,5 mm²
Housing Polycarbonate PC UL 94 V0 with hinge locks, color signal white similar to RAL 9003
Cable gland PG11 high-strength cable gland with strain relief
Display optional LCD display with backlight on/off/auto
Material Protection tube: stainless steel V2A
Dimensions Housing: L 89 x W 80 x H 47 mm, Protection tube: Ø 16 x 210 mm
Protection type Housing/electronic: IP65, Sensor: IP30
Protection class III
Working range r.H. 0...98% r.H. in contaminant-free, non-condensing air
Working temperature Probe: -20...+80°C, Electronic: -20...+70°C
Storage temperature -20...+50°C
Installation mounting flange (in scope of delivery)
Certificate industrial calibration certificate with reference to national standard
Approvals CE, EAC, RoHS

The high precision RKFT(H)/A duct humidity and temperature transducer registers the relative humidity 0...100% r.h. and the temperature of the air in the environment using a capacitive sensor and converts this measured value into a linear output signal 0-10 V respectively 4-20 mA.
As an option the device has a potential-free changeover contact and a backlit display.
The changeover contact can be defined for one of the two measured values.
The display content can be rotated in 90° steps using a menu and the measured value, the switching threshold set, the state of the respective relay, the MIN/MAX measured values for the selected intervals (1 h / 6 h / 12 h / 24 h) etc. can be read out. The value measured in addition to the temperature can be selected from the 4 parameters % r.h., g/m³, g/kg, dp can easily be selected per DIP switch.
In addition the humidity measuring device has a heating function to protect the sensor at high humidity 95...99% r.h.. If the relative humidity exceeds the threshold value set ex-works for more than 10 minutes the heating function is activated. The sensor is heated for a limited time and thus dried and protected against condensation. During the heating and the subsequent temperature balancing phase
the output signal is kept stable at the last measured value before the heating function was triggered.
The humidity and temperature sensor is very well protected against contamination by a screwable stainless steel sintered filter and can, if required, be finely calibrated in situ using an offset controller.