Vaisala DMP248 Service Manual download pdf (Page 9)

CHAPTER 2_______________________________________________________ PRODUCT DESCRIPTION

VAISALA __________________________________________________________________________ 3

CHAPTER 2 PRODUCT DESCRIPTION

General characteristics

The DMP248 transmitter is a microprocessor-based instrument for the

measurement of dewpoint temperature in low humidities. The

transmitter measures other quantities as well: relative humidity,

temperature and ppm concentration (dry). When the dewpoint

temperature is below 0 °C, the transmitter calculates the frostpoint

instead of the dewpoint. The dewpoint output can be scaled freely, for

example, dewpoint -40...+20 °C can be set to correspond to 0...1 V.

The DMP248 transmitter has two analogue outputs and can be

connected to a serial bus via the RS 232C interface or optionally

through an RS 485/422 serial module or a current loop module.

The transmitter can be configured in many ways. It can have either a

blank cover or a cover with a local display and keypad with which the

user can operate the transmitter. The power supply voltage can be se-

lected from three alternatives (24 VDC/VAC, 115 VAC, 230 VAC).

Two analogue output signals are selected from the measured

quantities; the signals can be scaled and the measurement ranges

changed within certain limits. The transmitter can be supplied with

two, five or ten metre sensor head cable. The alarm output option

enables two separate alarms that can be freely set by user.

Options

Alarm output 2 relays 8A/230V SPCO relays

Power supply 24 VDC (VAC) (standard), 115/230 VAC

Serial interface RS 232C (standard), RS 485/422, current loop

Display cover cover with or without local display & keypad

Cable length 2, 5 or 10 metres

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Vaisala DMP248 Service Manual Page 9