Pressure Controller/Calibrator
Barometric Reference Module (BRM)
17
Barometric Reference Module (BRM)
For absolute measurements, a Barometric Reference Module (BRM) must be
installed unless the PMM is equipped with its own barometric reference (refer to
the PMM specifications). When a BRM is installed, the Absolute Measurement
Mode becomes available (see Measurement Modes). The BRM can be installed
like a PMM on any of the open slots.
Rear-Panel Manifold Pressure Connections
The Product comes with one of three types of manifolds installed:
• NPT
• BSP
• SAE
The type of manifold is marked on its lower right corner. Table 4 lists the different
manifolds and port sizes. Manifold installation is explained in the Maintenance
section.
Table 4. Rear-Panel Manifolds
Manifold SUPPLY EXHAUST TEST
Reference
(REF)
VENT
NPT
[1]
1/4 inch
NPT
1/4 inch
NPT
1/4 inch
NPT
1/4 inch
NPT
1/8 inch
NPT
BSP
[2]
1/4 inch
BSP
1/4 inch
BSP
1/4 inch
BSP
1/4 inch
BSP
1/8 inch
BSP
SAE
[3]
7/16-20
SAE
7/16-20
SAE
7/16-20
SAE
7/16-20
SAE
5/16-24
SAE
[1] Requires the use of PTFE tape on the male adapter to ensure a good seal.
[2] Bonded seal is required to ensure a good seal.
[3] O-ring is required (which is normally included on the fitting) to ensure a good seal.
An accessory connection kit can be purchased to supply the common adapters
used to connect to the manifolds. See User-Replaceable Parts and Accessories
for more information.
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