RED1-NT
The Non-Self Test RED1
Explosion-proof flame detection for systems where optical self-test is not required.
Multi-Spectrum Sensing: UV (185–260 nm), IR (0.715–3.5 µm), and Visible (480–560 nm) sensors.
Purpose-Built for Specific System Requirements
The RED1-NT provides the same rugged, explosion-proof flame detection platform as the standard RED1 without integrated optical self-test functionality.
This configuration is selected when project specifications do not permit automated self-test, when downstream systems may interpret self-test signals as alarm conditions, when facility policy requires manual inspection and testing by operators, or when simpler detector logic is preferred within a specific control architecture.
Key Features
Confirm RED1-NT Alignment with Your Project
If your project specifies a non-self-test detector or you are evaluating system compatibility, Sierra can help confirm that the RED1-NT aligns with your control architecture and testing procedures.
Specialized Applications Across Sectors
Oil & Gas
Refineries, offshore platforms, and fuel handling operations requiring FM-approved explosion-proof detection in Class I hazardous locations.
Chemical
Petrochemical processing plants with volatile organic compounds, high-temperature reactions, and strict compliance requirements.
Semiconductor
Fabrication and process areas where rapid detection of specialty chemical fires supports facility-wide safety systems.
Technical Specifications Sheet
View available configurations, full product specifications, dimensions, and sensitivity ranges.
Frequently Asked Questions
What is the difference between the RED1-NT and the RED1-ST?
The RED1-NT is identical to the RED1-ST in detection technology, sensitivity settings, field of view, relay outputs, and hazardous area approvals. The only difference is that the RED1-NT does not include integrated optical self-test functionality.
Why would I choose a non-self-test detector?
Common reasons include project specifications that do not permit automated self-test, downstream control systems that may interpret self-test signals as alarm conditions, facility policies mandating manual operator testing, or regulatory requirements that mandate hands-on inspection.
Does removing the self-test affect detection performance?
No. The RED1-NT uses the same multi-spectrum UV/IR/Visible sensors and fire algorithms as the RED1-ST. Detection speed, range, sensitivity settings, and false alarm rejection are identical.
What is the operating temperature range?
Operating: −40°C to +85°C. Storage: −55°C to +110°C.
What mounting and wiring connections does the RED1-NT use?
Two ¾-inch NPT feed-through hubs. Screw terminals accept 14–22 AWG wire. Dimensions are 5.4 × 4.8 × 3.7 inches (13.7 × 12.2 × 9.4 cm) at approximately 3 lbs.
Can the fire/fault relays be configured as normally open or normally closed?
Yes. The RED1-NT Fire Relay and Fault Relay can each be connected as either N.O. or N.C. The detector can also be field-programmed for latching or non-latching operation.
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