INSTALLATION OPTIONS
The sensor head of the HMP233
transmitter is ideal for use in tight
spaces, but it can also be installed in
ducts and chambers or even on walls
with the help of an installation kit.
The kit consists of a flange and a
supporting bar for the sensor head
cable; using this kit the distance
between the sensor head and the
channel or duct wall can be easily
adjusted.
The installation of the HMP235 can
be made easier with an optional
mounting flange of aluminium or
stainless steel. The steel flange is
recommended for applications where
the conditions require more hard-
wearing materials.
The HMP238 can be ordered with a
ball valve set that enables
disconnecting and re-installing the
moisture probe for calibration for
example without the need to
interrupt the process.
CABLES
The cables of the HMP233, HMP234,
HMP235 and HMP238 can be either
two, five or ten metres long. The
HMP233 is available with two types
of cable: one for temperatures up to
+80 °C, the other for temperatures
up to +120 °C.
COVER
The transmitters can be supplied with
a cover which has a local display/
keypad. The display shows the
measurement readings and also
functions as a user interface.
A display/keypad transmitter is easy
to use and configure with the menu-
based commands of the built-in
software. A basic transmitter without
the display option is operated by
using three press switches inside the
cover.
SENSOR PROTECTION
The HMP230 sensors can be
protected with three types of filter:
- stainless steel sintered filter
(part no. 16452)
- PPS grid with stainless steel
netting (part no. 16720)
- PPS grid (part no. 16562)
A sintered filter is recommended
when the sensor head needs pro-
tection against mechanical shocks;
otherwise a steel netting filter is
sufficient. The open PPS (poly-
phenyl sulphide) grid should only be
used in clean environments where a
short response time is important. All
the filters can tole-
rate temperatures up to +180 °C.
When the transmitter has a compos-
ite sensor for re-gaining, either the
PPS grid with steel netting or
sintered filter must be used.
POWER SUPPLY MODULE
Standard HMP230 transmitters are
powered with 24 VDC or VAC. With
the power supply module, the
HMP233, HMP234, HMP235 and the
HMP238 transmitters can also be
used with 115 VAC or 230 VAC
supplies. The module is installed
inside the transmitter housing.
ALARM RELAYS
For applications where adjustable on/
off alarm control is needed the alarm
relay option is the solution. Alarm
relays include two SPCO (single pole
change over) type relays with
8A /230V contacts. They are easy to
adjust with a display keypad or
through RS 232. This option is
available for the HMP233, HMP234,
HMP235 and HMP238 transmitters.
CONNECTORS
The transmitters have several differ-
ent connector options for analogue
output signals, supply voltage
(24 VAC/VDC) and RS lines (RS
232C/422/485) (see Technical
Information on page 6). The connec-
tors have the EMC and IP65
protection as well as easy screw
connections.
Options
The transmitters are available
with a display/keypad cover as
well as several connector options
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