RTD Input, Signal Conditioner AP4151-2000

Diagnostic LEDs

Other than when executing the pushbutton calibration routine, the LEDs blink under the following conditions:

GREEN: 2 Hz when the input is under range 8 Hz when the input is over range.

RED: 2 Hz when the output is under range 8 Hz when the output is over range

An Under Range condition exists when the signal is lower than the operational low value minus 6.25% of the operational span. An Over Range condition exists when the signal is higher than the operational high value plus 6.25% of the operational span.

A voltage output short circuit can cause an under range condition (RED blinking at a 2 Hz rate). A current output open circuit can

cause an over range condition (RED blinking at an 8 Hz rate). There could be two or more LEDs blinking at the same time, which means the module has more than one error condition present. Only when all error conditions have been cleared will the LEDs retrurn to their

normal condition (Green ON, Red and Yellow OFF).

Calibration

For best results, calibration should be performed in the operating environment, allowing at least one hour warm-up for thermal stability of the system. If pre-calibration on a test bench is desired,

an output load equal to the input impedance of the devices connected to the AP4151-2000 output is recommended, along with the warm-up period.

Note: Many applications do not require calibrating the output levels and simply utilize the default operational ranges of the unit (0-5VDC, 0-10VDC, 0-20mA or 4-20mA). If the factory default calibration has been changed, the last saved operational output values are utilized. In those applications, the only calibration

required is the operational input values.

Once the maximum and minimum input values have been set, the Green and Red LEDs will be on. At this point, simply press the CAL button rapidly 3 times and you will exit the calibration routine without effecting the last saved calibration for the operational output values.

1. Connect a resistance decade box (with 0.01 precision) to the input (Pins 5 and 6). Jumper pin 4 to pin 5. Connect the output

to a voltage or current meter, depending on your application. Apply power and allow the system to reach thermal equilibrium.

2. Hold down the pushbutton switch for 4 seconds. The Yellow and Red LEDs should be on. Push the CAL button momentarily and the Yellow and Green LEDs will be on. (From this point on, you can exit the calibration procedure at any step without saving new data by holding the CAL button for at least 4 seconds.)

3. Set the resistance to the value that matches your desired maximum operational input temperature and push the CAL button. The Yellow LED should now be on.

4. Set the resistance to the value that matches your desired minimum operational input temperature and push the CAL button. The Green and Red LEDs should now be on. If you do not wish to change the output calibration, press the CAL button rapidly three times to exit the calibration routine.

5. If you do wish to do a custom operational range for the output,

increase the resistance until the output is precisely at the desired maximum level (e.g. 20.00mA) and push the CAL button. The Red LED should be on.

6. Decrease the resistance until the output is precisely at the desired minimum level (e.g. 4.00mA) and push the CAL button. All

three LEDs should now be on.

7. To finish calibration, push the button one final time. The calibration data is now saved. The Green LED should be on if the

input is within the calibrated range.

Default Settings

Input: Pt-100, 0-500°C

Output: 4-20mA

Ordering Information

Specify:

1. Model: AP4151-2000

Accessories:

M801-0000 Retaining Spring

M008-A 8 pin Track Mount Socket

M004-0000 4 ft Long Channel Track

MD08-0000 8 pin DIN Mount Socket