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Testo 6681 Temperature & Humidity Transmitter
Item #:
XXYY-0555-6681
Brand:
Testo
Share this product:
6681 Temperature & Humidity Transmitter by Testo
Industrial humidity measurement demands absolute professionalism. Not only in running the system, but also in the measuring technology used. The industrial humidity transmitter testo 6681, combined with the probe series testo 661x fulfils these high demands. The testo 6681 has a number of additional features, above and beyond the properties and benefits of a conventional transmitter, which will delight practitioners. This and other reasons make the
testo 6681 the first choice in drying technology, trace humidity and compressed air process technology, as well as in demanding air conditioning technology, e.g. in cleanrooms.
- Optimum adjustment concept thanks to adjustment of the entire signal chain incl. analog adjustment
- Profibus, Ethernet, relay and analog outputs allow optimum integration into individual automation systems
- Self-monitoring and early warning guarantee high system availability
- Calculation and presentation of all relevant humidity parameters
- P2A software for parameterization, adjustment and analysis saves time and costs in commissioning and maintenance
- Display with multi-language display
- Robust, easy-to-clean metal housing
Measurement parameters |
||
| Humidity | ||
| Selectable units | Dependent on probe, available are: relative humidity %RH; normed atm. dewpoint in °CtdA (°Ftd); dewpoint in °Ctd (°Ftd); absolute humidity in g/m³ (gr/ft³); degree of humidity in g/kg (gr/lb); enthalpy in kj/kg (BTU/lb); psychrometer temperature in °Ctw (°Ftw); water vapour partial pressure in hPa/H20; water content in ppmV; mixture dewpoint H2 O2 in °Ctm/°Ftm; %RH acc. to WMO; temperature in °C/°F | |
| Measuring range | 0 to 100 %RH | |
| Trace humidity | ||
| Selectable units | Dewpoint in °Ctd/°Ftd | |
| Measuring range | -60 to +30 °Ctd / -76 to +86 °Ftd (only with testo 6610) | |
| Temperature | ||
| Selectable units | Temperature in °C/°F | |
| Measuring range | Dependent on probe (testo 661x) | |
Inputs and outputs |
||
| Analog outputs | ||
| Quantity | 2 channels (analog signal type uniform for both channels, decided when ordering), additional 3rd channel (optional) | |
| Output type | 0/4 to 20 mA (2-wire/4-wire) 0 to 1/5/10 V (4-wire |
|
| Measurement rate | 1/s | |
| Galvanic isolation | Galvanic isolation of the output signals (2-wire and 4-wire), isolation of supply from outputs (4-wire) | |
| Resolution | 12 bit | |
| Accuracy of the analog outputs | 0/4 to 20 mA ± 0.03 mA 0 to 1 V ±1.5 mV 0 to 5 V ±7.5 mV 0 to 10 V ±15 mV |
|
| Max. load | 2-wire: 12 VDC: max. 100 Ω / 24 VDC: max. 500 Ω / 30 VDC: max. 625 Ω; 4-wire: 500 Ω |
|
| Further outputs | ||
| Ethernet | Optional: module can be fitted as intermediary layer | |
| Profibus-DP | Optional: module can be fitted as intermediary layer, cannot be combined with Ethernet module | |
| Relays | Optional: 4 relays (free allocation to measurement channels or as collective alarm with operating menu/PsA software), up to 250 VDC/3 A (NO/NC) | |
| Other outputs | Mini DIN for Testo P2A software and portable measuring instruments testo 400/650 | |
| Supply | ||
| Voltage supply | 2-wire: 24 VDC ±10 % 4-wire: 20 to 30 VAC/DC |
|
| Current consumption | max. 300 mA | |
General technical data |
||
| Design | ||
| Material | Metal | |
| Dimensions | 122 x 162 x 77 mm (without probe) | |
| Weight | 1.5 kg (without probe, without Profibus/Ethernet module) | |
| Display | ||
| Display | Optional: 2-line LCD with clear text line and relay status display | |
| Resolution | 0.1 %RH / °Ctd / °Ftd / °Ctw / °Ftw or 0.01 °C/°F 1g / kg / g/m³ / ppm | |
| Operation | ||
| Parameterization | 4 operating buttons for display / P2A software | |
| Installation | ||
| Probe connection | Digital probe connection | |
| Miscellaneous | ||
| Protection class | IP65 | |
| EMC | 2004/108/EG | |
Operating conditions |
||
| Operating temperature (with integrated relay) | -40 to +60 °C | |
| Without display Operating temperature | -40 to +70 °C / -40 to +158 °F | |
Without display Storage temperature |
-40 to +80 °C / -40 to +176 °F | |
| With display Operating temperature | 0 to +50 °C / +32 to +122 °F | |
| With display Storage temperature | -40 to +80 °C / -40 to +176 °F | |
| Measurement medium | Air, nitrogen; more on request: applicationsupport@testo.de | |
