Vaisala HMD70U Service Manual download pdf (Page 66)

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64

DMT345 and DMT346 Dewpoint Transmitters

for High Temperature Applications

The Vaisala DRYCAP

®

Dewpoint

Transmitters DMT345 and

DMT346 are designed for humidity

measurement in industrial drying

applications with particularly high

temperatures.

Both transmitters incorporate the

Vaisala DRYCAP

®

sensor, which is

accurate, reliable, and stable. The

sensor withstands condensation

and is immune to particulate

contamination, oil vapor and most

chemicals. The DRYCAP

®

sensor

stands out for its swift response time

and rapid recovery after getting wet.

Measure Humidity Directly

in Hot Processes

The DMT345 and DMT346 are

constructed for direct measurement

in hot processes. Therefore, there

is no need for sampling systems

and trace heating. As a result,

high accuracy and constancy are

maintained.

The Vaisala DRYCAP

®

Dewpoint Transmitters DMT345 and DMT346 are designed

to measure and control humidity especially in dry environments with high

temperatures.

The accuracy and stability of the

DMT345 and the DMT346 are due to

the unique auto-calibration function,

patented by Vaisala. This auto-

calibration makes the transmitter

perform a calibration and adjustment

by itself while the measured process

is running. If the measurement

accuracy is not confirmed, corrections

are made automatically. The

procedure is so quick and corrections

are so minor that it will go unnoticed.

This ensures low maintenance

and high performance. In normal

conditions, it is recommended to have

a traceable calibration performed

once a year.

DMT345, Accurate in Hot

and Dry Environments

The DMT345 is designed for accurate

humidity measurement in hot and

dry conditions. This model provides

unmatched dry end measurement

accuracy in temperatures up to 140 °C,

however the DMT345 can operate

safely in temperatures up to 180 °C.

The stainless steel probe is especially

designed for high temperatures and

has an optional installation flange that

allows an adjustable installation depth

and therefore a precise positioning.

Features/Benefits

▪

The DMT345 measures

humidity in temperatures up to

180 °C (356 °F)

▪

The DMT346 measures

humidity in temperatures up to

350 °C (+662 °F)

▪

Dew point accuracy ±2 °C

(±3.6 °F)

▪

Vaisala DRYCAP® Sensor

provides accurate, reliable

measurement with excellent

long-term stability and fast

response

▪

Withstands condensation

▪

Unique auto-calibration feature

▪

Optional local display with

keypad, mains power supply

module and alarm relays

▪

NIST traceable calibration

(certificate included)

▪

Analog outputs, WLAN/LAN

▪

Modbus protocol support

(RTU/TCP)

The large and clear display allows the

user to check data at a glance.

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