User's Manual

Linearization Data allows nonlinear signals to be linearized by entering the correct curve into

the ECO-A-X (Figure 5-4). If Linearize is set for NO, the CURVE POINTS menu data is not used

and no linearization is applied. When YES, the CURVE POINT entries are used and a straight-

line approximation is calculated between each of the 9 entries. 0% input always provides 0%

output and 100% input always provides 100% output. To prevent accidental data entry a special

keystroke sequence, of 4 consecutive UP keys, is required to enter this menu.

Figure 5-4: Linearization Menu

Backup Config. allows users to store the entire current ECO-A-X’s menu database into non-

volatile memory for restoration later if incorrect values are accidentally entered or uploaded.

Restore Config. restores the ECO-A-X’s menu database to the values from the most recent

Backup Config. The special keystroke sequence of 4 consecutive UP keys is also required to

perform backup and restore operations.

TX Sensor Life set for YES, causes the unit’s 4-20mA output to transmit a sensor life value

after successful calibrations during the CAL PURGE delay (see section 4.1). For normal

operation the ECO-A-X transmits 4mA during the CAL PURGE delay. But with the TX Sensor

Life = YES the unit transmits 4mA for the first 10-seconds, then for 5-seconds transmits a value

between 4mA and 5mA, with 4mA equal to 0% sensor life and 5mA equal to 100% sensor life

(see Figure 5-5). The output then returns to 4mA for the remainder of the CAL PURGE delay.

For example, if after a calibration sensor life is 75%, the ECO-A-X transmits 4.75mA during the 5-

second interval.

Note: TX Sensor Life should always be set for NO unless the 4-20mA receiver is capable of

interpreting the sensor life signal.

Figure 5-5: Transmit Sensor Life Timing Diagram

E n t e r K e y S e q u e n c e

t o a c c e s s me n u .

* * * *

NE X T k e y t o E x i t .

S e e Ma n u a l

L i n e a r i z e ? N O

D a t a P o i n t 1

% I n p u t 10 . 0 0

% Ou t p u t 10 . 0 0

PRESS

UP KEY

4-TIMES

C U R V E P OI N T S

Monitoring

Calibrating Cal Delay

Sensor Life Value

4mA=0% life

5mA=100% life

Monitoring

4mA for 10 seconds after Cal Exit Then, 4 - 5mA for 5 seconds

Cal level = 1.5mA if 3-wire transmitter

Cal level = 3.0mA if 2-wire transmitter

4mA