Duct humidity- and temperature sensors HYGRASGARD® KFTF-Modbus-RJ12

Item no. 2003-4281-6100-001

Product group: WG01

Duct humidity- and temperature sensors HYGRASGARD® KFTF - Modbus RJ12

Calibratable HYGRASGARD® KFTF - Modbus - T3 (±2.0%) or KFTF - 20 - Modbus - T3 (±1.8%) duct humidity and temperature transmitters with Modbus connection, in an impact resistant plastic housing with quick-locking screws, optionally with/without display and including a mounting flange. They have a plastic sinter filter (exchangeable) and serve to detect various parametres in humidity measurement. measurands include relative humidity (0...100% RH) and ambient air temperature (– 35...+80 °C).

Innovative Modbus sensor with galvanically separated RS485 interface, selectable bus termination resistance, DIP switches for setting the bus parametres and bus address in current-free state, LEDs for telegram status display, two separate push-in terminals and a large back-lit three-line display with customised programming in the 7-segment and dot-matrix ranges. The sensor is factory-calibrated and can be fine-tuned to ambient conditions by an expert.

Voltage supply

24 V AC (± 20 %) and
15…36 V DC

Power consumption

< 1.2 W/ 24 V DC; < 1.8 VA/ 24 V AC

Data points

Temperature [°C], relative humidity [% RH],
dew point [°C], absolute humidity [g / m³],
mixture ratio [g / kg], enthalpy [kJ / kg]

Measuring range, humidity

0...100 % RH

Measuring range, temperature

–35...+80 °C

Sensor

digital humidity sensor
with integrated temperature sensor,
low hysteresis, high long-term stability

Sensor protection

plastic sinter filter, Ø 16 mm, L = 35 mm, exchangeable
(optional metal sinter filter, Ø 16 mm, L = 32 mm)

Measuring ranges

0...100 % RH
–35...+80 °C

Accuracy

typically ± 0.2 K at +25 °C

Zero point offset

± 10 % RH (humidity)
± 5 °C (temperature)

Ambient temperature

–30...+70 °C

Medium

clean air and
non-aggressive, non-combustible gases

Bus protocol

Modbus (RTU mode),
address range 0...247 selectable

Signal filtering

4 s / 32 s

Process connection

by mounting flange, plastic
(included in the scope of delivery)

Connection

RJ12 plug

Protective tube

PLEUROFORM, material polyamide (PA6), with torsion protection,
Ø 20 mm, NL = 235 mm (optionally 100 mm), vmax = 30 m/s (air)
(option on request in stainless steel V2A (1.4301), Ø 16mm)

Electrical connection

0.2 - 1.5 mm², via push-in terminal

Cable connection

cable gland, plastic
(M 20 x 1.5; with strain relief, exchangeable,
inner diameter 8 - 13 mm) or
M12 connector according to DIN EN 61076-2-101
(optional on request)

Cable gland

2x M 20 x 1.5; with strain relief, replaceable,
inner diameter 8 - 13mm

Long-term stability

± 1 % per year

Permissible air humidity

< 95 % RH, non-precipitating air

Protection class

III (according to EN 60 730)

Protection type

IP 65 (according to EN 60 529)*

Protection type housing

IP 65