Compur 4120 operation manual Procedure, This is the last opportunity to abort the procedure

Compur Statox 4120

Procedure:

Remove splash guard and replace it by test gas adapter.

Connect span gas cylinder. Do not open regulator yet!

Connect diagnostic box to sensor head.

Reading diagnostic box: Red LED flashing; - “ready” – “x.xxx ppm”

Push CAL button	Reading diagnostic box: “CALIBR”
Push ENT button	Reading diagnostic box: “ppm = ?”

Enter span gas concentration in ppm. Reading diagnostic box: ppm = „value“. If you have entered a wrong value push button CE and repeat.

If you have entered an invalid concentration, the reading is “ERR KONZ”: Push button CAL again and repeat.

Now push button ENT Reading diagnostic box: “GAS ON!”

This is the last opportunity to abort the procedure!

Open span gas regulator

Push button ENT Reading diagnostic box: “WAIT”

Reading of a measured value after 2 minutes. Display diagnostic box: “x.xx ppm” (this not a calibration value yet).

Wait 1 minute to obtain second measured value from sensor head. Reading diagnostic box: “x.xx ppm“ (this not a calibration value yet).

Wait 1 minute

This procedure will repeat until the difference between two measured values is within the specified range. Then the new calibration factor will be displayed for 10 seconds.

Reading diagnostic box: “FKT = x.xx”; “GAS OFF!” Close span gas regulator

Confirm gas is off by pushing ENT Display diagnostic box: “READY”

Disconnect diagnostic box and switch it off. Close receptacle for opto coupler with the plug. Mount splash guard.

6.2.2 Use ex – works calibration

Each sensor carries a calibration factor. This factor indicates how far its individual sensitivity differs from a theoretical value (=1). Values between 0.60 and 2.00 will be accepted by the system. The lower the factor, the higher its sensitivity. The sensor head microprocessor corrects the sensor signal with this factor to obtain the correct measured value.

Programming the calibration factor:

Action	Reading Diagnostic box
Switch diagnostic box on
Connect diagnostic box to sensor head	Red LED flashing;
	READY-x.xxx ppm
Push FKT	FCT x.xx
Push FKT + ENT (no long break!)	FCT = ?
	ERR INPU
Enter factor If you have entered a wrong factor, push CE and	FCT = 1.20 (example
repeat.	FCT = ?
Now push ENT twice immediately	Red LED flashing READY
Switch diagnostic box off, Factor will be transmitted.
Disconnect diagnostic box

24