Specifications

molbox™ RFM™ OPERATION AND MAINTENANCE MANUAL

5.6.1.1 UPSTREAM ABSOLUTE RPT

Measures absolute pressure on the UP (HI) molbloc pressure connection port.

Connected pneumatically to the valving assembly and electrically to the main

board (COM4) (see Section 5.6.1.8).

5.6.1.2 DOWNSTREAM ABSOLUTE RPT

Measures absolute pressure on the DOWN (LO) molbloc pressure connection

port. Connected pneumatically to the valving assembly and electrically to the

main board (COM5) (see Section 5.6.1.8)

5.6.1.3 DIFFERENTIAL MICRORANGE RPT (OPTIONAL)

Measures differential pressure between the UP (HI) and DOWN (LO) molbloc

pressure connection ports (upstream (+), downstream (-)). Connected

pneumatically (x2) to the valving assembly and electrically to the main board

(COM6) (see Section 5.6.1.8).

5.6.1.4 DISPLAY

2 x 20 vacuum fluorescent, alpha-numeric display mounted to front panel.

5.6.1.5 POWER SUPPLY

molbox RFM has one power supply with two voltage outputs:

• V DC (± 5 %) @ 0.9 Amps: for valve excitation, RPT supply and analog circuit.

• V DC (± 5 %) @ 2.5 Amps: for micro board, main board, display and fan.

5.6.1.6 MICRO BOARD

The micro board supports a Motorola 68302 micro-controller, EPROM,

EEPROM, 128k x 16 bit NVRAM, 8 Mbit flash memory; RS232 and IEEE-488.2

communications; keypad and display control. An I/O port controls other ports

and devices within molbox RFM.

5.6.1.7 VALVING MODULE

The valving module (see Figure 17) consists of a manifold equipped with three

12 V, 2-way, solenoid valves. The valves connect and disconnect the RPTs to

the UP (HI) and DOWN (LO) rear panel ports and bypass the two ports together.

If molbox RFM is equipped with the microrange option, a fourth (3-way) solenoid

valve puts the microrange differential RPT into and out of service (bypassed or

not bypassed).