Watlow Mercury Relay or MDR Retrofit - Manual (Page 2)

Abbreviation & Terminology
(as used in this document)
0.5 – 0.5 amperes of current switching capability
2A – 2 amperes of current switching capability
5A - 5 amperes of current switching capability
10A – 10 amperes of current switching capability
15A – 15 amperes of current switching capability
12-24 – Supply voltage can be between 12 to 24 Volts
100-240 – Supply voltage can be between 100 to 240 Volts
100 ohm DIN – refers to 100-ohm platinum RTD that has a DIN curve.
100 ohm JIS – refers to 100-ohm platinum RTD that has a JIS curve.
1/32 DIN – Deutsche Industrial Norm standard for panel mounted controller, hole size is cut to 1.78”w x 0.88”h.
1/16 DIN – Deutsche Industrial Norm standard for panel mounted controller, hole size is cut to 1.78”w x 1.77”h.
1/8V DIN – Deutsche Industrial Norm standard for panel mounted controller, hole size is cut to 1.78”w x 3.63”h.
1/8H DIN – Deutsche Industrial Norm standard for panel mounted controller, hole size is cut to 3.63”w x 1.77”h”
1/8S DIN – Deutsche Industrial Norm standard for panel mounted controller, hole size is cut to 2.68”w x 2.68”h.
¼ DIN – Deutsche Industrial Norm standard for panel mounted controller, hole size is cut to 3.63”w x 3.63”h.
Action – determines the direction of control. Heat (reverse acting) or Cool (direct acting).
Auto Reset – the limit will automatically reset on a power cycle but requires manual reset on limit trip.
Cascade – a control algorithm in which the output of one control loop provides a set point for another loop. The second
loop, in turn, determines the control action.
Ch – Channel refers to an analog input. There are single and dual channel controllers.
Control Mode – the method that a controller uses to switch the outputs such as PID, ON/OFF, and Manual.
Differential - control algorithm in which the output is based on the difference of the inputs plus set point.
DIN – Deutsche Industrial Norm, a set of technical, scientific and dimensional standards developed in Germany. RTD
sensors with the DIN curve change resistance at a rate of 0.00385 ohms/ohms/C.
DIN Rail – standard DIN EN50022 mounting method for attaching devices onto a metal rail.
Fixed – refers to a set point that is fixed at one value.
High Limit - device will deactivate output on a temperature rise above set point.
Inductive Load – any device that has a wire winding such as solenoids, electromechanical relays or transformers.
Input – refers to the sensor types that may be connected.