14. WIRELESS TRANSMISSION TO DATA LOGGER. Ahlborn ALMEMO 2790, MA2790BTFV

Atmospheric pressure compensation

This can be programmed to any measuring channel (command B86, see Man.

6.3.3) and, with abbreviation '*P' in the designation, can even be forwarded for compensation purposes to the next device. (see Man. 6.3.6) The status of atmospheric pressure compensation is displayed both in the atmospheric pressure function and, for appropriate measured values, in the function field.

(see 11.1.2).

Display indicating that atmospheric pressure (not 1013) is programmed ´P´

Display indicating that atmospheric pressure is being measured´.P´ The dot flashes

To toggle from programmed value to measured value in function ´ mb ´ press keys PROG , FCT

14. WIRELESS TRANSMISSION TO DATA LOGGER

Cyclic wireless transmission of maximum four channels to wireless sensor module ZA1729-BTFS on an ALMEMO ® device begins when the cycle starts. (see

13.1)

Data from the sensor is modified as follows :

The original measuring ranges are replaced by the ´ DIGI ´ range; only the units and designation remain unaffected.

The parameters for measured value correction are already applied in the sensor device and therefore do not need to be transmitted.

Of the maximum eight channels possible with option RHA only the first four are transmitted. Those channels not required can be deactivated. (see 11.1.1)

If the sensor module is connected at socket M04, channel numbering changes from e.g. M00, M01, M10, M11 to M04, M14, M24, M34.

In the event of failure affecting the wireless measuring instrument, two cycles are left to complete and then sensor breakage is reported. Several wireless sensor links can be operated simultaneously; there is no mutual interference.

Data from all channels is transmitted in its original format via a USB interface cable.

15. TROUBLE-SHOOTING

The ALMEMO ® 2790 measuring instrument can be configured and programmed in many different ways. It is suitable for connecting a wide variety of dif ferent sensors. Given these numerous possibilities the device may in certain circumstances not behave quite as expected. The cause of such unexpected behavior is only very rarely a device defect; usually the cause is incorrect operation by the user, an invalid setting, or unsuitable cabling. In such event try to pinpoint and clear the problem with the aid of the following tests.

Error: No display, display malfunction

Remedy: Check the power supply; use fresh batteries or connect mains unit

(using rechargeable batteries); switch OFF and then ON again; if necessary re-initialize.(see 7.5)

ALMEMO ® 2790 25

15. Trouble-shooting

Error: Data transmission over the wireless link does not function.

Does the symbol ´ CONNECT ´ on the device light up ?

Does the yellow LED on the module light up ?

Remedy: Start measuring operation by pressing key F1 .

Inside a building attenuation may be too high; try reducing the distance; try using a cable to connect the sensor module, and then re-align the wireless module.

Error: Keys do not react

Remedy: Terminate sleep mode and / or device locking by pressing ON.

(see 13,1, 13.2)

Error: Measured values are not found in the data logger

Remedy: The measuring point numbers and measuring ranges may have changed; only four channels can be transmitted; try reconfiguring.

(see 11.1.1)

Error: Measured values are incorrect

Remedy: Switch the device OFF and then ON again; check all channel programming very carefully via the interface, especially the base value and zero-point.

Error: Measured values fluctuate unexpectedly or the system hangs in midoperation.

Remedy: Check the cabling for any inadmissible electrical connections.

Unplug sensor, connect a hand-held sensor in air or a phantom sensor (for thermocouples short-circuit A-B, for Pt100 sensors use 100 Ω) and check; then reconnect sensor and recheck. If necessary insulate the sensor or power the device using an electrically isolated supply.

Error: Error message ´ CALEr ´ is displayed when device is switched on

Remedy: The calibration of a measuring range may have become misadjusted.

The device must be recalibrated at our factory.

Error: Data transmission via the interface does not function

Remedy: This device accepts USB data cable DKU5/V only,

Has the correct baud rate been set on the computer (standard 9600 baud) ?

Ensure that the correct COM port on the computer is being addressed.

Test the data transmission by means of a terminal (Almemo-Control, Win-Control, WINDOWS Terminal). Check the programming by means of command ´ P15 ´. (see Man. 6.2.3).

If, after performing the above-listed checks and remedial steps, a device still fails to behave as described in the operating instructions, it must be returned to our factory in Holzkirchen, accompanied by a brief explanatory note, error description, and if available test printouts. (see 16.4) With the Almemo-Control software you can print out screenshots showing the relevant programming details and save and / or print out a comprehensive 'function test' in the device list or terminal mode.

26 ALMEMO ® 2790