Johnson Controls Control Temperature A421ABC-02C

The Johnson Controls A421ABC-02C is an electronic temperature control with digital setpoint adjustment.

Electronic temperature controls differ from mechanical bulb and capillary controls in several respects that matter practically.

Setpoint and differential are entered numerically rather than set by adjusting a screw against a scale, which removes the imprecision of mechanical adjustment and makes the settings readable by anyone who follows.

The sensor is a thermistor or similar device connected by ordinary wiring rather than a fluid filled capillary, which removes the vulnerability to kinking and fatigue and allows much longer sensing distances.

Accuracy is generally better, and the display shows actual temperature, which is diagnostically useful in itself.

Against these, an electronic control requires a power supply where a mechanical control does not, it can be damaged by electrical transients, and its settings can be altered by anyone who works out the menu.

For most modern applications the advantages dominate, and electronic controls have largely displaced mechanical ones in new work.

Confirm supply voltage, sensor type, output rating, and whether the output is suited to the load being switched.

Applications include commercial refrigeration, coolers, freezers, and process temperature control.

Brand

Johnson Controls

SKU

A421ABC-02C

Category

Temperature Controls

Weight

1.1 lbs

Dimensions

5.50" x 3.10" x 2.60"

Price

$125.00

Availability

In stock

Rating

0 / 5.0