Servomex NanoTrace DF-760E, Инструкция по эксплуатации

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Service DF-745 135
9.5
Troubleshooting Guide for the NanoTrace Dual
Analyzer
9.5.1.1 Oxygen Troubleshooting
Observation Possible Remedy
(see Key below)
Analyzer reads Over-Range Y, C, Q, I
Analyzer spikes excessively when moved using portable feature B, J, I
Analyzer output has unacceptable peak-to-peak noise J, H, X, I
Zero baseline gradually drifting positive G, A, B, C, D, Q, H, AB, I
Zero baseline gradually drifting negative P
Zero baseline high, but stable (> 15 ppb above factory zero) G, A, B, C, D, E, Q, AB, I
Very slow analyzer purge down (doesn’t drop below 10 ppb in 7 days)
G, A, B, C, D, E, Q, H, AB, I
Zero baseline drifting up and down (exclusive of temperature) H, Q, I
Repetitive negative spiking J, X, Z, A, B, C, D, E, Q, H, I, AA
Repetitive positive spiking J, X, Z
O
2
reading is drifting excessively with ambient temperature (> 0.3 ppb/C) E, G, P, R, AB, I
Electrolyte Condition Alarm ON A, N, C, D, H, I
O
2
reading does not decrease upon switch to on-board Delta F purifier
(Assumes sample gas contains some O
2
)
O
Span reading is unacceptably high (> 50% high) T, V, S, I
Span reading is unacceptably low (> 50% low) T, S, I, H
Unacceptably Slow Speed of Response L, G, H, I
Analyzer indicates high temperature AB, I
9.5.1.2 Key:
A
Add Delta F Replenishment Solution if level is near or below “MIN” mark
B
Remove some electrolyte if level is near or above “MAX” mark
C Measure applied voltages on electrode pairs:
Sensor Electrodes (wht/yel* and wht/red/blk) 1.300 ± 0.005 VDC
Secondary Electrodes (wht/blue* and wht/red) 2.1 ± 0.3 VDC
Stablex Electrodes (white* and blue) 1.55 ± 0.005 VDC
* is the common lead of the voltmeter.
D Measure the DC currents on electrode pairs:
Secondary Electrodes 2.0 ± 0.2 mADC (disconnect wht/red wire at reservoir terminal, and insert ammeter between
wht/red wire and reservoir terminal)
Stablex Electrodes < 13 uADC
(disconnect white wire at reservoir terminal, and insert ammeter between white wire and reservoir terminal)
E Check sensor temperature in Diagnostics Menu. It should be approx. equal to the current ambient temperature.
G Perform the low flow leak test: Obtain stable oxygen readings at flow = 2.0 scfh and flow = 1.0 scfh. The reading at flow
= 1.0 scfh should be no more than 2 ppb higher than that at 2.0 scfh. Locate and fix any ambient leaks upstream of the
analyzer. See page 120.