Description
Product Introduction
Product Overview
Emerson SS4301T02 is a Low-Side Sense Discrete Input CHARM. It works with 24V DC dry contacts. This CHARM detects on/off states from field devices. It fits into Emerson DeltaV CHARM I/O systems.
Why Choose This CHARM
Users get reliable dry contact sensing. The module offers fault detection with an optional resistor pack. It supports discrete state sensors changing under 2 Hz. This CHARM saves space and simplifies wiring.
What Makes It Unique
This model has built-in current limiting at 12.5 mA. It provides guaranteed short circuit detection below 100 Ω. The wetting voltage is 22.5V ±5%. Heat dissipation is only 0.33 Watts.
For similar I/O solutions, explore Versamax modules.
Technical Specifications
Brand & Model
- Brand: Emerson
- Product Number: SS4301T02
- Series: CHARM
- Type: Low-Side Sense Discrete Input
Input Characteristics – Dry Contact
- Sensor Type: 24V DC dry contacts
- On Detection Level: > 2.25 mA (below 5.3 kΩ)
- Off Detection Level: < 1.75 mA (above 8.2 kΩ)
- Channel Impedance: 4.8 kΩ
Wetting & Protection
- Wetting Voltage: 22.5V (±5%)
- Current limited to 12.5 mA nominal
- Short Circuit Guarantee: below 100 Ω
- Good Status Range: 400 Ω to 40 kΩ
- Open Circuit Guarantee: above 75 kΩ
Fault Detection
- Fault detection possible with optional field resistor pack
- Without resistor pack, fault detection is not available
- Refer to Option 1 diagram for wiring
Configurable Channel Types
- Discrete Input – dry contact
- Discrete state sensor changing under 2 Hz
Power & Heat
- CHARM Power Requirement: 18 mA max @ 24V DC
- Heat Dissipation: 0.33 Watts
Field Circuit Protection
- Current Limiting: 12.5 mA
- Includes field wiring disconnect
Installation Guide
Wiring Instructions
- Connect dry contact between field and CHARM
- For fault detection, install optional resistor pack as shown
- Use shielded wiring for noisy environments
Mounting
- Snap CHARM into DeltaV CHARM carrier
- Ensure correct orientation before insertion
Debugging & Maintenance
Setup Tips
- Verify wetting voltage is 22.5V ±5%
- Check current stays below 12.5 mA
- Measure resistance to confirm contact status
Troubleshooting
- If input reads wrong, check resistor pack
- Ensure field wiring is not open or shorted
- Monitor CHARM power at 18 mA max
Compatibility
System Compatibility
- Works with Emerson DeltaV CHARM I/O
- Fits all CHARM carriers in DeltaV racks
- Supports standard 24V DC field devices
Certifications & Approvals
Safety & Standards
- Meets Emerson quality standards
- Suitable for industrial control systems
- UL and CE compliant (refer to manual)
Packaging & Warranty
Box Contains
- 1 x Emerson SS4301T02 LS DI CHARM
- Installation guide
Warranty
- 12 months warranty from shipment date
- Covers manufacturing defects
Shipping Methods
- FedEx – priority and economy options
- UPS – worldwide express
- DHL – international door-to-door
Typical Applications
Common Uses
- Monitoring limit switches and pushbuttons
- Reading proximity sensors with dry contacts
- Interfacing with relay outputs from PLCs
- Low-speed state sensing under 2 Hz
FAQ – Frequently Asked Questions
What does SS4301T02 detect?
It detects on/off states from 24V DC dry contacts. It also checks for short, open, or good status.
How do I enable fault detection on this CHARM?
Install the optional field resistor pack. Without it, fault detection is not possible.
What is the guaranteed good status resistance range?
400 Ω to 40 kΩ shows good status. Below 100 Ω is short. Above 75 kΩ is open.
Can this CHARM work with sensors that change faster than 2 Hz?
No. It supports discrete state sensors changing under 2 Hz. Use other CHARMs for high-speed inputs.
What power does this CHARM need from the carrier?
It draws 18 mA maximum at 24V DC. Heat dissipation is 0.33 Watts.
How do I know if my field wiring is correct?
Measure resistance between the two wires. It should fall within 400 Ω to 40 kΩ for a closed contact.
Does this CHARM work with NAMUR sensors?
No, this CHARM is for dry contacts only. For NAMUR, choose the appropriate CHARM type.
Can I use this module in a high-vibration area?
Yes, CHARMs are designed for industrial environments. Ensure the CHARM snaps securely into the carrier.
How do I test the CHARM without a field device?
Connect a 4.8 kΩ resistor between the input and common to simulate a closed contact.
What is the maximum cable length for field wiring?
Keep wiring under 300 meters to avoid signal degradation. Use shielded cable for long runs.
Selection Guide
How to choose the right CHARM
- If you have dry contacts, choose SS4301T02
- If you need fault detection, order the resistor pack
- For high-speed inputs, select a different CHARM type
- Check voltage – this CHARM only supports 24V DC
Common mistakes to avoid
- Do not use without resistor pack if fault detection is needed
- Avoid connecting live voltage above 24V DC
- Do not exceed 2 Hz switching frequency
Real-world tip
Many users add the resistor pack from the start. This saves time later. Always test with a known good contact before connecting to sensors.
Contact & Support
For inquiries, reach out via WhatsApp: +86 158 8020 0923
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