Specifications

molbox™ RFM™ OPERATION AND MAINTENANCE MANUAL

3.6.3.1 UPPER LIMIT ALARM AND SEQUENCE

When the pressure reaches the upper limit, molbox RFM continues normal

operation but sounds an audible alarm. The alarm ceases if the pressure is

decreased below the upper limit.

When pressure reaches the overpressure

limit, molbox RFM valves close, normal

operation ceases and the display

indicates:

670.250 kPa 651.780

OVERP! CHK & PWR DWN

The top line indicates the current pressure measurement of the upstream (left)

and downstream (right) RPTs. The bottom line is the over pressure warning.

Pressure indications that are grossly out of scale generally indicate that the

RPT(s) have been fatally overpressured.

Other menus can be observed but the MAIN run screen can not be accessed

and no molbox RFM internal valves can be operated. To return the molbox RFM

to normal operation, it must be turned OFF and back ON or press [ENTER] from

the overpressure screen. When molbox normal operation is reestablished, its

isolation valves will open. Be sure the situation that led to the overpressure

condition is corrected before attempting to reestablish normal operation.

The upper limit and overpressure functions are intended to use molbox RFM's

features to the extent possible to protect the molbox RFM reference pressure

transducers (RPTs) against overpressure. The system is not failsafe and an

overpressure causing fatal damage to the RPTs can still occur. Ultimately,

protection of the RPTs is the responsibility of the user. RPTs damaged by

overpressure are not covered under the product warranty.

molbox RFM continuously monitors for maximum pressure. Whenever the

overpressure limit is exceeded, the pressure value reached, time and date are

logged to a privileged location. This information can be of use in determining

the events that led to an overpressure situation.

3.6.4 <4CAL>

To calibrate and adjust the molbox RFM reference pressure transducers and ohmic

measurement system.

The CALIBRATION functions are considered part of molbox RFM maintenance and are

therefore covered in the maintenance section of this manual (see Section 5).

3.6.5 <5PREFS>

 PURPOSE

To access a menu of molbox RFM internal operational preferences and functions.

These include:

• <scrSvr>: View and change the SCREEN SAVER function (see Section 3.6.5.1).

• <sounds>: View and change valid and invalid keypad entry sound settings

(see Section 3.6.5.2).

• <time>: View and edit the internal time and date settings (see Section 3.6.5.3).

• <ID>: View and edit the molbox RFM user ID (see Section 3.6.5.4).