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// Humedad
- MediciÓn de Punto de RocÍo - Transmisores
Dew Point Transmitters
The Alpha Moisture Systems range of dewpoint
transmitters are two/three wire, 24V powered,
4-20mA Dewpoint transmitters. Incorporated
into the design of these transmitters are advanced
electronics allowing for a power supply varying
from 18 to 30V DC and are configured to output
a linear, isolated, 4-20mA signal for the chosen
range. Various dewpoint ranges are available
covering an overall range from -110ºC to +20ºC
dewpoint.
Model AMT
Dew Point Transmitter
• 2 Wire Loop Powered Dewpoint Transmitter
• Overall Range -120°C to +20°C Dewpoint
• Accuracy ± 2°C Dewpoint
• AUTOMATIC CALIBRATION
• Can be Configured for Linear 4-20mA signal
in: °C & °F Dewpoint, ppm(v), ppb(v),
g/m3, lb/MMSCF
• Temperature Compensation
• Failure Diagnostics
• Long Term Stability
• Fast Reponse
• IP 66 / NEMA4X Protection
• Supplied with Calibration Certificate
Traceable to National & International
Humidity Standards
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Model AMT Dewpoint
Hygrometer is a two wire 4-20mA loop powered
transmitter, used for continuous measurement
of humidity in a process gas or compressed
air, which will output a linear 4-20mA signal
corresponding to the dewpoint temperature.
The Model AMT transmitter can also be factory
configured to output a 4-20mA linear signal
for any other moisture unit e.g. ppm(v),
ppm(w), g/m3, lb/MMSCF etc.
The Ultra High Capacitance sensing element
is long lasting and offers excellent sensitivity,
repeatability and response speed. Each unit
is supplied with a Certificate of Calibration,
traceable to International Humidity Standards,
validating accuracy to ±2ºC dewpoint.
The transmitter also incorporates an Automatic
Calibration (AUTOCAL) feature, which allows
the user to carry out a field calibration
/ span check. The AUTOCAL feature is operated
by means of two small button switches built
within the transmitter enclosure. To avoid
tamper, the switches are locked in normal
use and can only be activated by following
a special routine.
The integral RISC microprocessor circuitry
of the Model AMT transmitter allows high
resolution with advanced selfdiagnostics
for fault conditions. It also enables periodic
re-calibration of the moisture sensor, storing
calibration data within the fully self contained
unit. Loop powered by a 7V to 28V dc source,
the Model AMT transmitter will provide a
linear 4-20mA signal over the chosen range.
The mechanics of the Model AMT transmitter
have been designed to cope with extreme environmental
conditions. The rugged stainless steel construction
offers protection to IP66 (NEMA4X), with
the transmitter electrical connections made
via a secure industrial connector.
Model AMT transmitter can withstand 35,000
kPa (350bar) maximum pressure and by employing
a low resistance cable, the transmitter can
be located at significant distances, in excess
of 1000 metres, from the control room. Designed
with the operator in mind, for reliable and
accurate measurements, the Model AMT transmitter
is extremely easy to install and operate,
requiring little or no maintenance.
The Model AMT transmitter is supplied with
a Certificate of Calibration, an instruction
manual and 2m connecting cable. |
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Model ADHT-Ex
Intrinsically safe
Dewpoint Transmitter
• 3 Wire, 24V, 4-20mA Dewpoint Transmitter
• Intrinsically safe - CENELEC EEx ia IIC
T6, ATEX II 1G
• Various Ranges: Overall Range -110ºC to
+20ºC dewpoint
• Accuracy ±2ºC Dewpoint
• Weatherproof Rating IP65
• Open/Short Circuit Detection
• Built-in temperature compensation
• Supplied with Calibration Certificate Traceable
to National & International Humidity
Standards
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The Alpha Moisture
Systems Model ADHT-Ex is a 3 wire, 24V
powered 4-20mA dewpoint transmitter. The
unit is fully self contained in a robust
casing with weatherproof protection to
IP65, making it ideal for use in heavy
industrial environments.
Designed with the operator in mind, Model
ADHT-Ex is extremely easy to use and the
digital dewSMART technology ensures accurate
and reliable readings with little or no maintainance.
Model ADHT is certified intrinsically safe
to EEx ia IIC T6 for use in hazardous areas
using an MTL 2441B signal isolator for 110V
/ 240V AC operation or MTL 5042 for 24V DC
operation.
Various ranges are available covering an
overall range from -110ºC to +20ºC dewpoint.
The Model ADHT-Ex derives its power directly
from the signal isolator and it is configured
to give a linear 4-20mA signal for the chosen
range. |
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