VDH ALFA 10 User manual

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User manual
ALFA 10 and
ALFANET 10
Thermometer.
VDH doc: 000525 Version: v2.3 Date: 05-11-2007
Software: ......_ALFA 10/20/30 File: Do000525.wpd Range: see product sticker
* Function.
The ALFA(NET) 10 is a digital thermometer for rail mounting. De temperature is readout in hole
degrees. The ALFANET 10 has a RS 485 network connection so it can be read out the Alfanet.
*Installation.
On the connection diagram is shown how the sensor and power supply have to be connected. After
connecting the ALFA(NET) 10 to the power supply, a self-test function is started. As this test is finished,
the measured temperature appears in the display.
*Control.
The ALFA 10 thermometer has for normal use no need for controls. Only for adjustment of the sensor
the ALFA 10 has three hidden pushbuttons on the front.
SET - view / change the setpoint.
UP - increase the setpoint.
DOWN - decrease the setpoint.
These pushbuttons are placed at the following places at the front:
SET - Left below the display, above ‘VDH’.
UP - Middle below the display, on ‘OC’.
DOWN - Right below the display, above ‘ALFA 10'.

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*Setting internal parameters.
To enter the internal parameter menu, use the following instructions;
By pushing the DOWN key more than 10 seconds, you enter the ‘internal programming menu’. In the
left display the upper and lower segments are blinking. Over the UP and DOWN keys the required
parameter can be selected (see table for the parameters). In this case only ‘04’ offset temperature
sensor.
If the required parameter is selected, the value can be read-out by pushing the SET key. Pushing the
UP and DOWN keys together with the SET key allows you to change the value of this parameter.
If after 20 seconds no key is pushed, the ALFA(NET) 10 changes to its normal operation mode.
*Parameters ALFA(NET) 10.
PARA-
METER
DESCRIPTION PARAMETER RANGE STANDARD
VALUE
04 Offset temperature sensor -15..+15C 0
90
95
96
97
98
99
Network number
Software version
Production year
Production week
Serial number (x1000)
Serial number (units)
1..250
0..255
00..99
1..52
0..255
0..999
1
-
-
-
-
-
*Adjustment sensor.
The sensor can be adjusted by using the Sensor Offset (parameter 04). Indicates the ALFA(NET) 10
e.g. 2C too much, the Sensor Offset has to de decreased with 2C.
*Error messages.
In the display of the ALFA(NET) 10 the following error messages can appear:
Er - Sensor broken. Solution:
- Check if the sensor is connected correctly.
- Check the sensor (1000at 25C).
- Replace the sensor.
EE - Settings are lost. Solution:
- Reprogram the settings.

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* Technical details.
Model :ALFA 10 Thermometer
ALFANET 10 Thermometer with network
Range :-50/+50C, readout per 1C (Standard)
Or else see product sticker
Supply :230 Vac / 1,2VA 50/60Hz (or else see product sticker)
Control :by push buttons on the front.
Front :Polycarbonate
Sensor :SM 811/2m (1000 Ohm at 25C)
Communication :RS485-Network (2x twisted pair shielded)
Sizes :90 x 53 x 58mm (hwd)
Panel hole :46 x 53mm (hw)
- Provided with memory protection during power failure.
- Connection with screw terminals on the back side.
- Equipped with self test function and sensor failure detection.
- Special version on request available.
*Address.
VDH Products BV Tel: +31 (0)50 - 30 28 900
Produktieweg 1 Fax: +31 (0)50 - 30 28 980
9301 ZS Roden Email: [e-mail]
The Netherlands Internet: www.vdhproducts.nl

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*Dimensions. *Connections.