Manual

Vaisala DRYCAP
®
Dewpoint Transmitter DMT242
USER'S GUIDE June 2008 | M010036EN-D
TECHNICAL SPECIFICATIONS
Dewpoint Temperature
Measurement range -80 ... +60 °C (-112 ... +140 °F)
DMT242A -80 ... +20 °C (-112 ... +68 °F)
DMT242B -60 ... +60 °C (-76 ... +140 °F)
DMT242X free scaling
When the dewpoint is below 0 C, the transmitter outputs
frost point.
Dewpoint accuracy with
DRYCAP
®
180M ±2 ºC (±3.6 ºF)
(See figure below)
Response time 63 % [90 %] at 20 °C gas temperature at
flow rate > 1 l/min and 1 bar pressure:
-60  -20 °C T
d
(-76  -4 °F T
d
)
5 s [10 s]
-20  -60 °C T
d
(-4  -76 °F T
d
)
45 s [10 min]
DRYCAP
®
180S ±2 ºC (±3.6 ºF)
(See figure below)
Operating Environment
Temperature 0 ... +60 ºC (32 ... +140 ºF)
Higher temperature peaks Short term OK
Relative humidity 0 ... 100 %RH
Pressure 0 ... 20 bar
a
(0 ... 290 psi
a
)
Sample flow rate no effect
Output
Analog output 4 ... 20 mA
Resolution for analog output ±0.002 mA
Typical temperature dependence 0.0008 mA/ºC
Serial line for service use RS-232
General
Sensor DRYCAP
®
180M
Operation voltage 17 ... 35 VDC
20 ... 28 VAC
Power consumption 24 VDC max 220 mA
External load for current
output
max 500 Ω
Optional connection cable
with DMT242 connector
2 m or 10 m
Connector for supply voltage
and signal output
Max wire size 0.75 mm
2
Max wire diameter 6.5 mm/PG7
Service cable for serial line DMT242RS
Probe material stainless steel
(AISI 316L)
Sensor protection stainless steel sintered
filter (HM47280)
Mechanical connection G1/2" ISO228-1 thread
with bonded seal ring
(U-seal)
Electronics housing plastic (ABS/PC)
Housing classification IP 65 (NEMA 4)
Storage temperature range -40 ... +70 ºC
(-40 ... +158 ºF)
Complies with EMC standard EN61326-1:1997 +
Am1:1998 + Am2:2001; Industrial Environment.
Figure 4 Dimensions in mm [inches]
*
M
010036
EN
*