633T Signal Splitter, AC/DC-Powered by Acromag

Companies & Organizations:

United States of America

Acromag, Incorporated
30765 South Wixom Road
Wixom, Michigan 48393-2417 USA

- Single input, dual output (splitter)

- 15-36V DC SELV, 90-250V AC

- Provides two identical outputs from one input signal


These units receive 4-20mA process current inputs and provide isolated 4-20mA output signals. Each channel operates independently and is isolated from the others to prevent interaction between channels. Galvanic isolation eliminates ground loops, reduces noise, and blocks transient signals.


Units are shipped with factory calibration for quick installation. These isolators also automatically compensate for load resistance variations, so re-calibration is rarely necessary. However, adjustable zero and span trim pots are provided to ensure precise calibration for maintenance requirements and long term serviceability.


These isolators generate a 24V input excitation supply suitable for powering one or two 2-wire transmitters. The supply is current limited at each output to prevent any excitation short from pulling down the internal power supply. The internal DC supply improves system performance by isolating loops on a single or dual channel basis. It saves space, complexity, and the expense of installing additional supplies to power your field loops.


Input / Output Ranges

4 to 20mA DC input, 4 to 20mA DC output.


Power Requirement

12-36V DC; 90-250V AC (125V DC ±10%); Four-wire isolated transmitter.



CE marked. UL, cUL listed. Class I, Division 2, Groups A, B, C, D.


Reference Test Conditions

Input/output current: 4 to 20mA

Output load: 250 ohms

Power: 24V DC or 115V AC; 77°F (25°C).



Input Range: 4 to 20mA input (each channel).

Input Burden Voltage drop: Less than 3.0V (150 ohms) at full scale.

Input Overvoltage Protection: Bipolar Transient Voltage Suppressors (TVS).

Input Excitation: 24V DC ±10%, 22mA maximum each. Fully isolated. Includes independent current limiting at EXC1 and EXC2 near 23mA, each.



Output Range: 4-20mA DC output (each channel).

Output Trim Range: Zero and full-scale adjustment to ±4%.

Output Limiting: Outputs are limited to 27mA.

Output Load: 0 to 950 ohms.

Output Load Resistance Effect: Less than ±0.01% of output span effect for a ±100 ohm change in load resistance.

Output Response Time (for input step change): 25mS typical to 98% of final output value.



±0.05% of output span. Error includes the combined effects of isolator repeatability, hysteresis, terminal point linearity and adjustment resolution.


Temperature Drift

Better than ±50ppm/°C (±0.005%/°C) over the ambient temperature range. This specification includes the combined effects of zero and span over temperature.



Two 15-turn potentiometers (zero and span) per output channel, accessible from front of the unit.



-3dB at 50Hz, typical with a 500 ohm load.


Noise Rejection

Common mode: Better than 100dB at 60Hz, typical.

Normal mode: -6dB at 60Hz, typical, 500 ohm load.


LED Indicators

Green, one LED per output channel. Constant ON indicates power applied.



Ambient Operating Temperature: -25 to 75°C (-13 to 167°F), [if excitation supplies are used 633T, -25 to 60°C (-13 to 140°F)]

Ambient Storage Temperature: -40 to 85°C (-40 to 185°F)

Relative Humidity: 5 to 95%.

Power Requirement for DC-powered units: 12-36V DC SELV

Power Requirement for AC-powered units: 90-250V AC (125V DC ±10%)

Wattage: 3.0 watts without excitation, 4.8 watts with excitation.

Isolation: Inputs, outputs, individual channels, power, and excitation supplies are isolated from each other for common-mode voltages up to 250V AC, or 354V DC off ground, on a continuous basis (will withstand 1500V AC dielectric strength test for one minute without breakdown).

Electromagnetic Field Immunity (EMI): Less than ±0.25% of output span effect under the influence of electromagnetic fields from switching solenoids, commutator motors, and drill motors.

Meets Immunity Standards Per EN50082-1 Electrostatic Discharge (ESD) Immunity: 4KV direct contact and 8KV air-discharge to the enclosure port per EN61000-4-2.

Radiated Field Immunity (RFI): 10V/M, 80 to 1000MHz AM and 900MHz keyed carrier, per EN61000-4-3 and ENV50204.

Electrical Fast Transient Immunity (EFT): 2KV to power and 1KV to signal I/O per EN61000-4-4.

Conducted RF Immunity (CRFI): 10Vrms, 150KHz to 80MHz, per EN61000-4-6.

Surge Immunity: 0.5KV per EN61000-4-5.

Emissions Per European Norm EN50081-1 Radiated Frequency Emissions: 30 to 1000MHz per EN55022 Class B.

Approvals: CE marked, UL & cUL listed. Hazardous Locations: Class I: Div. 2; Groups A, B, C, D



Enclosure Case: Self-extinguishing NYLON type 6.6 polyamide thermoplastic UL94 V-2 NEMA Type 1 enclosure.

Connectors (Removable Terminal Blocks): Wire Range - AWG #14-22 (AWG #12 stranded only).

Printed Circuit Boards: Military grade FR-4 epoxy glass circuit board.

Dimensions: 1.05W x 4.68H x 4.35D inches. 26.7W x 95.3H x 110.5D millimeters.


Features & Benefits


Two channels in a single unit saves space and reduces costs.

Signal splitter model provides two identical isolated outputs from one input signal.

Built-in isolated excitation supply with short circuit protection can drive up to two field 2-wire process loops.

Full isolation safely separates each input channel, each output channel, the excitation supply, and power.

Excellent accuracy and stability ensure reliable operation in hostile environments.

Low input burden keeps voltage drop to less than 1.5V for full-scale current.

Supports wide 0 to 1000 ohm load range and no trimming is required if the load varies.

Current limiting safely limits output to 27mA.

Pluggable terminals, zero/span trim pots and power LEDs make installation, maintainance, and long term service easy.

-25 to 75°C (-13 to 167°F) operation, [if excitation supplies are used on 633T -25 to 60°C (-13 to 140°F)]

Defense Products & Services: 633T Signal Splitter, AC/DC-Powered by Acromag
Companies & Organizations: 
Defense Products & Services Sectors: Computers components
Description: 633T Signal Splitter, AC/DC-Powered
Source of Information: Acromag Inc