mA
V
mA
V
CH1
CH2
A
Service Port
Use only in safe area
!
Do not remove this cover
1
2
Test Points
Figure 14 Location of test points and service port
1 Multimeter test points for analog output channels 1 and 2
2 Service port for PC connection
The transmitter body enclosure must not be opened in an explosion
hazardous area, unless a safe work permit has been issued in accordance with
the standard IEC 60079-14. Either remove the transmitter from the hazardous
area before opening the enclosure, or ensure that an IEC 60079-14 compliant
safe work procedure has been implemented in the hazardous area.
CAUTION!
Use an intrinsically safe multimeter that won't cause the intrinsically safe input parameters
listed in Table 22 (page 47) to be exceeded when it is connected in series (current
measurement) or parallel (voltage measurement) to the associated apparatus.
Using the service port
The service port (see Figure 14 (page 48)) must only be used in a safe area. Either remove the
transmitter from the hazardous area or ensure that a safe work procedure has been
implemented in the hazardous area. Only use the Vaisala accessory PC connection cable with
the service port.
Maintenance
The probe (includes probe body and head) can be detached and replaced by the user. The
probe head filter (see Figure 13 (page 45)) is also user-replaceable. For other maintenance
requirements, contact Vaisala.
The probe can be detached and changed when HMT370EX is
powered. Any other live maintenance, including changing the probe head filter,
is not allowed.
CAUTION!
HMT370EX User Guide M212305EN-B
48
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