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Chromalox® 3101 1/4 DIN High/Low Digital Limit Controller

Chromalox Electric Heaters and Controls
Mor Electric Heating is an authorized distributor for Chromalox®

UL Listed

• One High/Low Limit Control Output

• Two Independent Alarm Outputs

• Analog Process Output for Retransmit of Process Variable

• Peak Temperature Display

• Universal Sensor Inputs

• NEMA 4X Front Panel

• Switching Power Supply 100-240 Vac or 12-24 Vac/Vdc

• Digital Communications with ChromaSoft™ Compatibility


The 3101 is a compact, fully programmable high or low limit controller. It is a UL Listed Overtemperature (or Undertemperature) controller, and FM approved as a limit controller. With user programmable inputs, outputs and high/low limit features, it is flexible to most any limit control application, and can be easily reconfigured as needed.

Peak Temperature Display

The 3101 records and displays the peak process temperature.

Over Setpoint Timer Display

The 3101 is equipped with a timer to record the total process time over setpoint.


Control Limit Output can be programmed for high or low limit control (overtemperature or undertemperature).

Two Independent Alarm Outputs, Form C Relays, can be used to warn of impending out-of-limit process conditions, providing protection for equipment and personnel.

Universal Sensor Input accepts thermocouple, RTD or analog signals.

24 Vdc Output for loop power.

Digital Input available for remote alarm reset.

Analog Process Output option for retrans-mission of process variable to a remote recorder, computer or other device.

Isolated Serial Digital Communications (RS-232/422/485) can be used to address from 1 up to 255 Chromalox controllers.

Security Code Protection prevents unauthorized access to programmable control parameter.

Operating Ambient up to 150°F.

Three Year Warranty.


Limit Output


Normally-energized latching relay; relay de-energizes at limit setpoint. Form C contacts, 5 Amps at 120/230 Vac

Limit Control Adjustments

High/Low Limit Setpoint     Sensor Range

Setpoint Limit     Sensor Range

Deadband     0-100°F

Display Offset     -100 to +100°F

Alarm Outputs (2)

Relay     Form C contacts, 5 Amps at 120/230 Vac (resistive)

Sensor Input Field selectable Thermocouple, RTD, Current or Voltage

Digital Input Accepts dry-contact closure

Input Specifications

    Range °F Range °C

J TC -100 to +1400 -73 to +760

K TC -300 to +2400 -184 to +1316

T TC -350 to +750 -212 to +399

E TC -100 to +1100 -73 to +593

R TC 0-3200 -18 to +1760

S TC 0-3200 -18 to +1760

B TC 50-3300 10 to +1816

100W Pt RTD (a = .00385) -200 to +1000 -128 to +538

4-20mA -500 to +5000 (programmable)

0-5 Vdc -500 to +5000 (programmable)

1-5 Vdc -500 to +5000 (programmable)

Transmitter Power

+24 Vdc Output     +24 Vdc ± 20% at 50 mA maximum

Digital Communications (Optional)

RS-232     Single-drop, isolated

RS-422/485     Multi-drop, isolated, field selectable by switch

Instrument Power

100-240 Vac, +10%, -15%; 50-60 Hz; 15 VA

12-24 Vac/Vdc, ± 20% (optional); 15 VA

Operating Environment 32-150°F (0-65°C) ambient temperature, relative humidity less than 95%, non-condensing

Chromalox Specification Data Sheet
Chromalox Product Instruction Sheet

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Delivery time: Typically ships in 5-7 working days or less plus allow additional time for your selected UPS or FedEx shipping method.  Your shipping cost will be displayed in your shopping cart.

Item ID PCN# Catalog# / Description Click "Select" below to see our price and actual real-time quantity in stock.
CHROM306982 306982 3101-11000 / 2 RELAY 120/240 VAC ST A Select
CHROM306990 306990 3101-11100 / 2 RELAY PROC OUT ST A Select
CHROM307002 307002 3101-11010 / 3 RELAY RS422 ST A Select
CHROM307010 307010 3101-11020 / 3 RELAY RS232 ST A Select

Chromalox® is a registered trademark.

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5880 Alpine Ave. NW - Comstock Park, MI 49321  USA
Tel 616-784-1121 - 800-442-2581 - Fax 616-784-7775

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