Simplex 4098-9747 is the CO Replacement Cartridge (CORC), the field-replaceable electrolytic carbon monoxide sensing element for Simplex TrueAlarm CO sensor bases. A TrueAlarm photoelectric sensor is continuously checked and drift-compensated by the panel, but an electrolytic CO cell cannot be tested or compensated that way. Johnson Controls therefore gives it a fixed operational lifetime tracked by a date code in the CO sensor module electronics, and the panel counts it down. The 4098-9747 is what you fit when that count runs out.
The control unit gives warning first: an Almost Expired trouble appears twelve months out and again at six months, then an Expired (End of Life) trouble. A TrueAlarm CO service report shows each sensor's current ppm reading, end-of-life date and state.
Specifications
| Product type |
CO Replacement Cartridge (CORC), electrolytic CO sensing element |
| Compatible bases |
4098-9770 CO base; 4098-9771 CO base with sounder |
| Service life |
10 years with 4007ES, 4010ES and 4100ES control units; 5 years with 4100U |
| Life tracking |
Date code in the CO sensor module, counted at the control unit |
| UL 2034 response |
70 ppm: 60-240 min; 150 ppm: 10-50 min; 400 ppm: 4-15 min |
| Access |
Remove the tamper-monitored sensor head; removal causes a trouble |
| Instructions |
CORC replacement instructions, document 579-791 |
Installation notes
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Expired means replace. The sensor continues to function after the Expired trouble, but replacement is required for detection accuracy.
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Life depends on the panel: plan replacement from the panel type in the building (10 years versus 5 years on a 4100U).
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Expect a trouble while you work: lifting the head trips tamper monitoring, so place the panel in the appropriate service state first.
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Verify afterwards using the panel CO test mode with a Solo 332 dispenser and Solo C3 CO canister, or equivalent.
Related models
4098-9770 (CO base, powered from the IDNet channel) and 4098-9771 (CO base with integral sounder, needing separate 24 VDC or NAC power). Photoelectric, photo/heat and heat heads (4098-9714, 4098-9764, 4098-9733) sit above the cartridge.
Documents
FAQ
When does the 4098-9747 need to be replaced?
When the panel reports the CO sensor as Expired. Johnson Controls sets a 10-year operational life (5 years on 4100U panels), tracked by a date code in the CO sensor module; Almost Expired troubles appear before that.
Does the CO sensor stop working when it expires?
It continues to function after the Expired trouble, but replacement is required to keep CO detection within its rated accuracy.
How do I reach the cartridge?
Remove the TrueAlarm sensor head from the CO base. The head is tamper-monitored, so removing it creates a trouble at the panel; put the system in the appropriate service state first.
Which bases use this cartridge?
Simplex TrueAlarm CO sensor bases, including the 4098-9770 standard CO base and the 4098-9771 CO base with sounder.
