
GDS-68XP Operation & Maintenance Manual, Revision 3.5
Page 10
3
SPECIFICATIONS
Model
GDS
‐
68XP
Process
Monitor
for
Low
Oxygen
Applications
Power
Input
24VDC
±
5%
at
<
12
watts
Display
High
resolution
color
LCD
with
engineering
units,
bargraph
and
30
‐
minute
trend
Sensor
Types
Electrochemical
sensors
for
toxic
gases
Inlet
Pressure
Requirements
Sample
draw:
Ambient
to
+5
inches
of
water
column
Low
pressure
/
no
regulator:
+5
inches
water
column
to
+25
psig
(±
10%
max)
High
pressure
/
standard
filter:
+10
psig
to
+1500
psig
High
pressure
/
combination
filter:
+10
psig
to
+1500
psig
Draw
Distance
Demonstrated
up
to
100
feet
of
¼”
OD
tubing
Accuracy
+/
‐
5%
of
full
scale
(typical)
Standard
Output
Three
‐
wire
4
‐
20mA
current
source
outputs
with
fault
and
overrange
indication.
Maximum
loop
resistance
is
750
ohms
with
standard
24VDC
supply.
Ethernet
RJ
‐
45
with
built
‐
in
MODBUS/TCP
interface
and
web
server
Optional
Relay
/
MODBUS
interface
with
3x
5A
SPDT
programmable
alarm
relays.
Temperature
(operating)
0°C
to
+50°C
standard
(no
enclosure)
Note
:
Ambient
temperature
below
0°C
may
keep
purge
air
pump
from
starting
‐
20°C
to
+50°C
with
NEMA
4X
enclosure
and
optional
200W
AC
heater.
Heater
thermostat
is
set
to
50°F
and
is
not
user
‐
adjustable.
Temperature
(inert)
‐
20°C
to
+55°C
In
cold
weather,
GDS
Corp
recommends
turning
on
the
AC
heater
(if
installed)
for
several
hours
before
applying
DC
power
Memory
On
‐
board
non
‐
volatile
memory
retains
all
user
settings
Materials
Instrument
housings:
Aluminum
Tubing
&
fittings
316
stainless
steel
Dimensions
Painted
steel
plate:
21”
x
21”
x
8”,
NEMA
4x
non
‐
metallic
enclosure,
24”
x
24”
x
8”
Approvals
GASMAX
CX
Gas
Monitor
CSA
Certified
Class
I,
Div
1
&
2
Groups
B,
C,
D.
Sequencer
enclosure
CSA
certified
for
use
in
Class
I
Div
1
areas.
Flame
arrestors
UL
certified
for
use
in
Class
1
Div
1
areas.
Warranty
Two
years
on
electronics