LOOP POWERED INDICATORS FIELD/PANEL
MOUNTED DM400 and DM420 Series
NEMA 6 (DM400)
NEMA 4 (DM420)
Engineering
Units
Loop Powered
Only 1 Volt
from Loop (DM400/420)
Intrinsic Safety
Version
2 Year Warranty
INTRODUCTION Theseloop powered
3 1/2 digit indicators are designed to be connected
in series with a 4 to 20 ma current loop and to display,
in engineering units, the process variable represented
by the current flowing.
FIELD MOUNT
DM400
A loop powered field indicator
requiring only 1 volt from the loop, supplied in a NEMA
6 housing. It can be mounted directly to a transmitter,
wall or duct, or in a conduit line via the 1/2"
NPT threads. The housing has sufficient room to
mount a hockey puck style transmitter. Coarse
and fine potentiometers are provided for both SPAN and
ZERO adjustment.
DM401
A lower cost version requiring
3 volts from the loop.
DM400X
I.S. approved for use in
hazardous area applications.
PANEL MOUNT
DM420
A panel mounted loop powered
indicator which, when assembled with the sealing gasket
supplied, provides NEMA 4 protection. Scaling
is set by a combination of jumpers and SPAN and ZERO
potentiometers. This device requires only 1 volt
from the loop.
DM421
A lower cost version requiring
3 volts from the loop.
DM420X
I.S. approved for use in
hazardous area applications.
INTRINSIC SAFETY APPROVALS
The IS approval is to EECS (BASEEFA) EEx ia IIC
T5 Certificate No. Ex 90C2062 Systems certificate No. Ex 83432.
GENERAL SPECIFICATIONS @ 68 °F
DM400
DM400X
DM401
DM420
DM420X
DM421
.Maximum
current
±125
±150
±63
±125
±150
±63
ma
.Maximum
operating current
3.8
3.8
3.8
3.8
3.8
3.8
ma
.Maximum
loop drop
@ 20 mA
1.0
1.6
3.0
1.0
1.6
3.0
volts
.Loop
ripple
20
20
n/a
20
20
n/a
µa
.Fuse
protection
none
none
63
ma
.Input
.4
to 20 ma two wire (reverse polarity protected)
.Display
.LCD
3 1/2 digits 1/2" LCD
.Display
range
.-1000
to +1999 counts 3 1/2 digits
.Offset
.-1000
to +1000 counts at 4 ma
.Span
.200
to 2000 counts (16 ma change)
.Decimal
point
.3
positions plus blank
.Accuracy
.±1%
of reading ±1 count
.Span
stability
.±0.01%/ºF
Maximum
.Offset
stability
.±0.01%/ºF
Maximum
.Sample
rate
.3
readings per second
.Ambient
.32
ºF to 122 ºF
ORDER CODE (DM400 Field Mount Unit)
DM4(Version) / Lo / Hi / Units
/ Ports
.DM4
Basic Model Number
.Version
.00
= Standard Version
.00X = I.S. Version
.01 = Low cost version
.Lo
.Low
Reading @ 4 ma
.Hi
.High
Reading @ 20 ma
.Units
ºF
ºC
%
bar
bar g
bar abs
mbar
in wg
ft wg
m wg
mmHg
kg/cm2
m
l/s
l/min
l/hr
gal/min
gal/hr
%CO2
ft
psi
psi g
psi abs
%RH
ft/min
VDC
mvDC
ADC
maDC
K
Any of the above units are standard
.Ports
.A
= 1 side port
.B = 2 side ports (standard) .C = 1 side
port plus 1 base port .D = 2 side port
plus 1 base port
