The LF-TD 60 is the basic industrial transmitter of the LF-TD series: it measures the relative humidity and the temperature of air over a range up to 60 °C and delivers both quantities as 4-20 mA signals. It suits warehouses, production halls, climatic chambers and low-temperature drying rooms, laboratory and air-conditioning technology, the timber, food and feed industries, construction, printing and papermaking, agriculture, biotechnology and the pharmaceutical industry.
In production, processing, storage and transport it is the air humidity that decides whether the material dries evenly, whether condensation appears and whether the batch keeps its quality. A continuous measurement makes it possible to react before the process leaves the intended window.
The sensor tube, 12 mm in diameter and 100 mm long, is made of plastic and ends in a cap with a filter. The anodised aluminium electronics housing has mounting holes, so the device is fastened straight to a wall, a frame or a machine enclosure. For mounting in a corner there is the angle bracket (art. no. 13612), and the drip guard (art. no. 12456) protects against drops of water.
Humidity and temperature leave the transmitter as two independent 4-20 mA current signals: humidity scaled 0 to 100 %, temperature scaled -20 to +60 °C. A signal like that is accepted by any PLC, data logger and analogue input module, without additional software. The supply is 12 to 29 VDC, the current consumption about 18 mA.
The optional display with a keypad (art. no. 13731) shows the current humidity and temperature on the device itself. The reading can also be led out over an RS232 (art. no. 12807), USB (art. no. 12808) or Ethernet (art. no. 13738) interface. If the measurement is to reach the network through an RJ45 socket straight away and no current output is needed, the simpler solution is the LF-TD-E.
When the process air goes above 60 °C, the same measurement is made by the next models of the series: the LF-TD 90 up to 90 °C, the LF-TD 120 up to 120 °C, the LF-TD 150 up to 150 °C and the LF-TD 180 with a remote head up to 180 °C.
Every LF-TD transmitter is calibrated at the factory at six humidity points. The calibration accuracy is ±2 % over the range of 10 to 90 % relative humidity and ±0.3 °C over +10 to +60 °C. A factory calibration certificate with an adjustment report is supplied on request (art. no. 10403), and the sensor can be checked in place with the calibration device for tube probes (art. no. 10006) together with certified ampoules.
AdvantagesThe capacitive humidity sensor keeps its accuracy over years of operation and withstands the usual contamination and contact with many chemicals. It settles quickly after a change of conditions, so it suits processes in which the humidity changes within minutes.
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| Article number | 12609 |
| Sensor tube | plastic, Ø 12 x 100 mm, cap with a filter |
| Relative air humidity | 0 to 100 % |
| Humidity calibration | ±2 % (10 to 90 %) |
| Humidity output | 4 to 20 mA (0 to 100 %) |
| Temperature range | -20 to +60 °C |
| Temperature calibration | ±0.3 °C (+10 to +60 °C) |
| Temperature output | 4 to 20 mA (-20 to +60 °C) |
| Power supply | 12 to 29 VDC |
| Current consumption | 18 mA (without interfaces, display and bus) |
| Operating temperature of the electronics | -20 to +85 °C |
| Optional interfaces | RS232, USB, Ethernet |
| Dimensions of the electronics housing | 70 x 32 x 120 mm |
| Protection class of the electronics housing | IP 54 |
| Electrical connection | 1.9 m connecting cable |
LF-TD 60 with a 1.9 m connecting cable.
For similar applications we also recommend the LF-TD-TA, a simpler transmitter with 4-20 mA outputs only, and the LF-TD 90 with a wider temperature range, up to 90 °C.
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