Check 5 — ARM Display Values
Verify CO2 regulator, Brite pressure, and temperature readings with CO2 on the ARM port — Health Check Idents R, S, and T.
Check 5 — ARM display values
With CO2 still connected to the ARM port from Check 4, re-read the same three display values as Check 2. This matters because in Check 2 the arm circuit was open to atmosphere, so Brite psi read zero and a transducer stuck at zero could have passed. Here the arm circuit is pressurized, so Brite psi should now show a real pressure, which is what proves the transducer is actually responding.
Preconditions
The checks
| Ident | Display value | Criterion | Tolerance |
|---|---|---|---|
| R | CO2 reg psi | Equals the supply regulator dial, and falls between 30 and 40 psi | ±3 psi |
| S | Brite psi | Equals the CO2 reg psi reading, and falls between 30 and 40 psi | ±3 psi |
| T | Temperature | A representative value, similar to the reading recorded at check C | Judgement |
Reading R: regulator pressure
Same as Ident A. Compare the display's CO2 reg psi against the supply regulator dial, then record both numbers on the Results Form.
Reading S: the key measurement
With gas fed into the ARM port, the arm circuit is pressurized to supply pressure. Brite psi and CO2 reg psi should therefore agree within 3 psi. If Brite psi still reads near zero, the Brite transducer is not responding. Change it and inspect for fluid in the pipe leading to the transducers.
Reading T: compare against C
Temperature should be close to whatever you recorded at check C. A significant change between the two readings, taken minutes apart in the same location, points to an intermittent sensor or a loom fault.
If a check fails
| Ident | Symptom | Actions |
|---|---|---|
| R | Wrong reg psi | 1. Try a different CO2 regulator. 2. Change the CO2_In pressure transducer. 3. Check the CO2_In check valve per Ident L. |
| S | Brite psi reads wrong pressure | 1. Change the Brite pressure transducer. 2. Inspect for fluid inside the unit. |
| T | Temperature reads wrong | 1. Change the WizzTemp sensor. 2. Inspect the internal loom. Confirm with the Slushy WizzTemp Test. |
Next step
Check 6 — Leak Testing
Test the arm circuit for leaks with the gloved finger and separator tests.