Michell Instruments MDM300 I.S, Руководство пользователя

Страница: 34 / 72

MDM300 I.S. User’s Manual
26 97213 Issue 5, October 2017
OPERATION
3.4.4 EXTERNAL (Sensor Interface)
!
The MDM300 I.S. is designed to be connected ONLY to a
Michell Instruments’ remotely mounted Easidew I.S. or
Easidew PRO I.S. transmitter. Connection to any other type of
sensor could impair safety.
The Easidew I.S. or Easidew PRO I.S. must be connected
retaining the associated I.S. barriers and using a Michell
Remote Sensor Interface module. See Section 2.6.
EXTERNAL TYPE NONE
EXTERNAL ZERO N/A
EXTERNAL SPAN N/A
USER PRESSURE ATM Psig
EXTERNAL
Figure 19
EXTERNAL SET-UP Page
Parameter Description
EXTERNAL TYPE
De fi nes use of Easidew I.S. transmitter.
NOTE: The ZERO and SPAN limits are automatically added
for this transmitter.
Available Input:
NONE, EASIDEW
EXTERNAL ZERO
De fi nes external zero (lower limit).
The
ZERO
default limit is pre-programmed but can be rede fi ned.
Available Input: Range:
-120 to +30°C
EXTERNAL SPAN
De fi nes external span (upper limit).
The
SPAN
default limit is pre-programmed but can be rede fi ned.
Available Input: Range:
-120 to +30°C
USER PRESSURE
Used in the calculation of dew point at pressure, moisture content
and absolute humidity. If a user pressure is not selected then the
MDM300 I.S. assumes atmospheric pressure. (Refer to Section 2.6.2.)
NOTE: Pressure compensation does not affect the reading
of the external sensor.
Available Input: Range
ATM
,
0 to 300 barg
(or equivalent in other
units).
Table 7 EXTERNAL Sensor Parameters