The Harrington HS-3030 is a very large networkable system solution that was manufactured by Harrington Signal, Inc. Harrington Signal is now owned by Potter and is being phased out of existence.
Harrington HS-3030 Datasheet
Harrington HS-3030 Installation Manual
Harrington HS-3030 Operating Instructions
Harrington HS-3030 Programming Manual
Harrington HS-3030 Operator Manual
1251 Ionization type smoke detector
1251B Ionization type smoke detector
2251 Photoelectric type smoke detector
2251B Photoelectric type smoke detector
2251T Photoelectric type smoke detector w/ thermal element
2251TB Photoelectric type smoke detector w/ thermal element
2251TM Acclimate Photo-Thermal Detector
2251TMB Acclimate Photo-Thermal Detector
MRI-7251 Pinnacle™ Intelligent Laser Sensor
5251P Thermal Detector
5251B Thermal Detector
5251RP Thermal detector w/ rate of rise
5251RB Thermal detector w/ rate of rise
5251H High Temperature Thermal detector
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M502M Monitor Module for 2- wire smoke detectors Classes A/B
initiating
M500S Control Module
M500R Relay Module
M500X Fault isolator module