Industrial Scientific OLDHAM 300 Series, Руководство по эксплуатации и техническому обслуживанию

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20
! ! WARNING! !
Adjustment
If the current loop of the output signal has an impedance of 500 ohms, the power supply should
never fall below 23 V DC.
OUTPUT SIGNAL ZERO ADJUSTMENT = 4 mA
Inject nitrogen at a rate of 30 l/h.
On the X1 terminal board, place an ammeter between terminals 1 and 2 (-). With the
potentiometer Z, adjust the current to 4 mA.
With the ammeter still connected, inject the test gas at a rate of 60 l/h. Adjust the sensitivity
with the potentiometer S (Ref. 1, Fig 21). Refer to the following calibration curves for sensors
without linearization cards.
If this fails, flip the J2 jumper and begin again.
Fig. 21
1.7.CTX300 CO2 Linearization card
If you use a linearization card, the connection is the following :
Ref. 1
J2
S