Rki-instruments 35-3000RK-LEL/O Uživatelský manuál stáhnout pdf (Strana 19)

35-3000RK-LEL/O Sample-Draw Detector • 15

6. Insert the cone-shaped front ferrule on top of the bottom ferrule. Insert the ferrule so

the smaller end of the cone is facing up.

7. Screw the nut onto the fitting by hand just until it stops turning.

8. Insert the sample tubing into the fitting until it bottoms out.

9. Firmly tighten the nut so the ferrules crimp onto the sample tubing and make a seal.

Adjusting the Low Flow Setting

NOTE: Adjusting the low flow setting will cause a low flow alarm at the sample-draw

detector and a fail alarm at the controller on the combustible channel. Be sure to

put the controller into its calibration program or disable external alarms before

performing this test.

The factory-set low flow setting is 0.6 SCFH (±0.2). To adjust the low flow setting:

1. Use the flow adjust potentiometer (VR1) to set the flow to 0.6 SCFH.

If the sample-draw detector goes into low flow alarm before you can adjust the flow

down to 0.6 SCFH, adjust the low flow potentiometer 1/4 turn clockwise, then

attempt to set the flow again. Repeat this step until you are able to adjust the flow to

0.6 SCFH.

NOTE: The low flow potentiometer is accessible through a circular cutout in the main

circuit board. The cutout is labeled PS1.

2. Slowly turn the low flow potentiometer counterclockwise just until the sample-draw

detector goes into low flow alarm.

3. Increase the flow using VR1 until the unit is out of low flow alarm.

4. Decrease the flow very slowly and verify that the low flow alarm is 0.6 SCFH (±0.2).

If the low flow alarm is set too low, turn the low flow potentiometer slightly

clockwise. Repeat steps 3 and 4 if necessary.

5. Use the flow adjust potentiometer (VR1) to set the flow to 1.5 SCFH.

6. Make sure the sample-draw detector’s Fail light is off.

Calibration Frequency

Although there is no particular calibration frequency that is correct for all sample draw

detector applications, a calibration frequency of every 3 to 6 months is adequate for most

applications. Unless experience in a particular application dictates otherwise, RKI

Instruments, Inc. recommends a calibration frequency of every 3 months.

If an application is not very demanding, for example detection in a clean, temperature

controlled environment where combustible gases are not normally present and calibration

adjustments are minimal at calibration, then a calibration frequency of every 6 months is

adequate.

If an application is very demanding, for example if combustible gases are present often

and in significant concentrations or the environment is not well controlled, then more

frequent calibration than every 3 months may be necessary.

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Rki-instruments 35-3000RK-LEL/O Uživatelský manuál Strana 19