Edwards SIGA-CT1 — a Signature Series intelligent analog-addressable single input module that connects one Class B normally-open alarm, supervisory or monitor dry-contact initiating device circuit to a Signature loop.
The module gathers analog information from the initiating devices wired to it and converts it into digital signals; its on-board microprocessor analyzes the signal and decides whether to input an alarm. What the module actually does is set by a “personality code” the installer selects and the Signature loop controller downloads during system configuration — the same hardware serves as a latching alarm input, a retarded waterflow input, a non-latching monitor point, or a latching supervisory point. The SIGA-CT1 mounts to a standard North American 1-gang box, which makes it the right choice for remote locations where only one module is needed.
Specifications
| Type code |
48 (factory set); four sub-types (personality codes) available |
| Address requirements |
Uses one module address |
| Operating voltage |
15.2 to 19.95 VDC (19 VDC nominal) |
| Operating current |
Standby 250 µA; activated 400 µA |
| Operating environment |
32°F to 120°F (0°C to 49°C) |
| Storage environment |
-4°F to 140°F (-20°C to 60°C); humidity 0 to 93% RH |
| Construction |
High impact engineering polymer |
| Mounting |
North American 2-1/2 in. (64 mm) deep 1-gang boxes, and 1-1/2 in. (38 mm) deep 4 in. square boxes with 1-gang covers and SIGA-MP mounting plates |
| LED operation |
On-board green LED flashes when polled; on-board red LED flashes when in alarm/active |
| Initiating circuit wire resistance |
50 ohms per circuit maximum (25 ohms per wire) |
| Initiating circuit wire capacitance |
0.1 µF per circuit maximum |
| Maximum distance to EOLR (design reference) |
4,000 ft (1,219 m) |
| Compatibility |
Use with Signature Loop Controller; EST3, EST3X and iO Series control panels |
| Agency listings |
UL, ULC, MEA (S3424), CSFM (7300-1657:0121) |
| Ship weight |
0.4 lb (0.15 kg) |
Installation notes
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One personality code only: a single code can be assigned to the SIGA-CT1. Mixing codes across two circuits is a SIGA-CT2 / SIGA-MCT2 capability, not a CT1 one.
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Choosing the code: 1 = normally-open alarm, latching (pull stations, heat detectors). 2 = normally-open alarm, delayed latching — alarm is sent after the contact is closed for approximately 16 seconds, intended for waterflow alarm switches. 3 = normally-open active, non-latching (fans, dampers, doors). 4 = normally-open active, latching (supervisory and tamper switches).
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Will not support 2-wire smoke detectors. The data sheet states this explicitly for these input modules.
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End-of-line resistor: the wiring diagram calls for a 47k ohm EOL resistor on the initiating device circuit.
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Circuit limits: maximum 25 ohms resistance per wire, 0.1 µF capacitance per circuit, and maximum 10 VDC at 350 µA on the initiating circuit. All wiring is supervised and power-limited.
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Wire size, with a caveat: terminals take #18 AWG (0.75 mm²) through #12 AWG (2.5 mm²), with #16 and #18 AWG preferred for ease of installation. Note that the data sheet’s own design-reference table lists #12 AWG as 1.50 mm², which contradicts the 2.5 mm² figure given for #12 AWG elsewhere in the same document; 2.5 mm² is the value stated in both the Installation section and the specification notes.
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No switches or dials: addressing is electronic. Addresses are downloaded from the loop controller, a PC, or the SIGA-PRO Signature Program/Service Tool. Ground fault detection is by address, down to device level.
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Power dependency: the module will not operate without electrical power.
Related models
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SIGA-CT2 — dual input version: two circuits, two module addresses, and personality codes 1 through 4 may be mixed between circuit A and circuit B.
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SIGA-CT1HT — the high-temperature single input module, rated 32°F to 158°F (0°C to 70°C) for attic installation and monitoring high-temperature heat detectors.
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SIGA-MCT2 — functionally identical to the SIGA-CT2 but built as a plug-in UIO module for two- or six-position UIO motherboards, with wiring landed on the motherboard.
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SIGA-MB4 — mounting bracket that allows two 1-gang modules in a 2-gang box.
Specifications taken from the Edwards data sheet “Input Modules — SIGA-CT1, SIGA-CT1HT, SIGA-CT2, SIGA-MCT2,” document E85001-0241, Issue 1.1. Manufacturer specifications are subject to change without notice.
