Vaisala HMT370EX - HMP378 Probe for Pressurized Pipelines

4.8 HMP378 probe for pressurized pipelines
The HMP378 probe option is especially suitable for measurements inside pipelines. Due to its
sliding fit (available probe lengths: 226 mm and 448 mm (8.90 in/17.6 in)), HMP378 is easy to
install into and remove from a pressurized process. A ball valve kit (Vaisala item code:
BALLVALVE-1) is available for connecting the probe to a pressurized process or pipeline.
Installation options
For instructions on installing HMP378 into a process with the fitting body (R1/2”ISO7/1 or
NPT1/2”) of the probe, see Attaching HMP378 to process with fitting body (page 73).
For instructions on installation with the optional ball valve kit, see Attaching ball valve kit to
process (page 75) and Installing HMP378 with ball valve kit BALLVALVE-1 (page 77).
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HMP378F and HMP378H probe variants for measuring oil and
JET A-1 fuel moisture
The HMP378F and HMP378H probe options are variants of the standard HMP378, designed for
measurements in oil (HMP378F; default calculation coecients valid for transformer oil) and
JET A-1 fuel (HMP378H). They provide a specialized selection of measurement parameters (see
Table 4 (page 12)) intended specifically for oil and JET A-1 fuel measurements. With HMP378F,
oil-specific calculation coecients can be configured into use to customize the measurement
for a specific oil type: see Configuring calculation coecients (page 117).
For more information on HMP378F, see HMP378F probe option for measuring oil moisture and
temperature (page 79).
For more information on HMP378H, see HMP378H probe option for measuring JET A-1 fuel
moisture and temperature (page 79).
Chapter 4 – Probe options
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