Owner's manual

EZ-ZONE PM Limit Express • 13 • Install & Wiring

Note:

In the drawings below for each input notice that the Slot A connector labeling is identified.

Note:

When using a 2 wire RTD, jumper S1 and T1 together

Inputs

All inputs shown below represent input 1 (the only input) and are to be connected to slot A of the Limit Control.

Process Volts and Amperes

• 4 to 20 mA @ 100 Ω input impedance

• 0 to 10VÎ (dc) @ 20 kΩ input impedance

• Scalable

Resistance Temperature Detector (RTD)

• Platinum, 100 Ω @ 0°C

• Calibration to DIN curve (0.00385 Ω/Ω/°C)

• 20 Ω total lead resistance

• RTD excitation current of 0.09 mA typical. Each

ohm of lead resistance may affect the reading by

0.03°C.

• For 3-wire RTDs, the S1 lead must be connected

to R1.

• For best accuracy use a 3-wire RTD to compen-

sate for lead-length resistance. All three lead

wires must have the same resistance.

Thermocouple

• 2 KΩ maximum source resistance

• >20 MΩ input impedance

• 3 microampere open-sensor detection

• Thermocouples are polarity sensitive. The nega-

tive lead must be connected to S1.

• To reduce errors, the extension wire for thermo-

couples must be of the same alloy as the thermo-

couple.

Thermistor

• >20 MΩ input impedance

• 3 microampere open-sensor detection

Thermocouple

RTD

2 or 3 Wire

Process

Volts

Process

Amperes

Thermistor