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1.0
DESCRIPTION
The DM640X series of intrinsically safe battery powered temperature indicators are
designed to work with industrial standard temperature sensors. The DM640XP variant
accepts a RTD (pt100) sensor, while the DM640XTC accepts a thermocouple sensor.
The sensor type, temperature units and other flexible configuration settings are
selectable via a simple to use menu system, navigated by the use of three push-button
keys located on the rear of the display. This is described in detail further on in this guide.
The entire assembly is encapsulated into a cap that fits directly onto the Status SCH4
series of connecting heads. Please refer to the SCH4 data sheet for further information.
2.0
RECEIVING AND UNPACKING
Please inspect the packaging and instrument thoroughly for any signs of transit damage.
If the instrument has been damaged, please notify your supplier immediately.
3.0
SPECIFICATION @ 20 °C
DM640XP
Accuracy
±0.2°C ± 0.1% of reading (Plus sensor error)
Resolution
0.1 °C
Measuring range
(-100 to 800) °C
Stability
Zero 0.01°C /°C
Span 0.005%/°C
Sensor
3 wire Pt100 to BS EN 60751(adjustable), or Ni120
Lead effect
10
per leg insignificant effect
Units
°C (default) or °F
Sensor type
Pt100 (default) or Ni120
DM640XTC
Accuracy
± 0.1% of FS ± 0.5°C (plus sensor)
Resolution
0.1 °C
Measuring range
See table below
Stability
Zero 0.02°C /°C
Span 0.01%/°C
Cold Junction Accuracy
±0.05°C/°C
Units
°C (default) or °F
Sensor type
K (default), T, J, N, R, S, E, F
Sensor
Range (
°C
)
K
-200 to 1370
T
-210 to 400
J
-100 to 1200
N
-180 to 1300
R *
-10 to 1760
S *
-10 to 1760
E
-200 to 1000
F
-100 to 600
* For type R and S sensors accuracy only applies between 800 and 1760 °C
DM640X General
Display
4 digit LCD
Battery Life
> 1 year @ 20°C ambient
Battery type
special battery refer to section 4
Ambient Temperature
(-10 to 50) °C
ATEX Approval
Refer to section 6
EMC Approval
Tested to BS EN 61326
Mechanical
Low profile SCH4 Head ABS, IP67 rating when used with
base unit
Connection
Sensor three way screw terminal block to accept 18-22 AWG
wire
4.0
INSTALLATION AND WIRING
4.1 Configuration
Warning The DM640X configuration operation must not be performed in the
hazardous area, return unit to the safe area for this operation.
Fit the battery as described in section 4.4, then follow the simple configuration menu
shown on pages 3 & 4, using the INC, DEC and CYC key (
see Fig 2
) to navigate. This
procedure can be performe d with or without the sensor connected. If the DM640X has
been configured for ° F, then affix the °F legend to the front panel, over the °C symbol.
4.2 Enclosure
The SCH4 case offers various options for sensor entry. Please refer to the SCH4 data
sheet f or further details. The sensor may be fixed directly to the SCH4 housing, or
remotely connected using cable and gland. All external cabling/sensor entries must
maintain IP67 rating.
4.3 Wiring
The DM640X series is provided with a two part connector bl ock, this allows for the cap
assembly to be un-plugged from the sensor for maintenance, while in the hazardous
area. Refer to the internal product label
(Fig2)
for the correct sensor connection details.
On the DM640X TC version, to maintain correct operation of the automatic cold junction
correction, ensure the thermocouple wires are either connected directly into the terminal
block or connected using the correct type of thermocouple extension wires.
On the DM640XP variant ensure three sensor wires are of the same type and length.
Cable length must be no greater than 10 metres to comply with CE certification.
4.4 Battery
BATTERY WARNING !!!
Important The battery must only be replaced in the safe area !!
Fire, Explosion and severe burn hazard. Do not Recharge, Crush,
Disassemble, Heat above 100°C (212°F), Incinerate or expose contents to
water.
Never short circuit the battery.
Disposal, the battery may be regulated by national and local regulations.
Please follow the instructions of the proper regulator.
The battery must only be replaced with a Tekcell SB- AA11 manufactured by
vitzo cell, available from either Status Instruments or your local distributor,
part number 28 -302-0036-00.
To install battery,:-
First gain access to the cap assembly by unscrewing the SCH4 cap retaining nut
and removing cap from base. Unplug the sensor connect
(fig 2 item3),
then trans-
port the cap assembly to the safe area.
Only when in the safe area, unscrew the two battery cover retaining SHCS screws
(fig 2 items 1)
using a suitable key. Then remove the cover
(fig 2 item 2).
To remove a fitted battery
(fig 2 item 6),
ease out the positive end of the battery
from the holder, using a screw driver blade.
To fit battery, insert battery negative into the spring contact end of the battery
holder, then press battery into place. See
fig 2
for correct polarity.
Replace the battery cover
(Fig 2 item 2)
ensure it is fitted the correct way
,
secure
with the two SHCS retaining screws
(fig 2 item 1).
Ensure unit is operating correctly, then transport cap to the application in the
hazardous area.
Re-connect sensor plug
(fig 2 item 3),
fit cap onto base and secure with nut.
The DM640X contains a battery monitoring system. When the battery approaches the
end of its lifetime (over 1 years under normal conditions), the display will toggle the
message “LO BAT”.
DM640XP & DM640XTC
Intrinsically Safe Battery
Powered Digital Thermometers
Designed, manufactured and supported by:
456 Park Avenue
Scotch Plains, NJ 07076
Tel: 800-700-3272 Fax: 800-700-5468
Email:
Every effort has been taken to ensure the accuracy of this specification, however we do
not accept responsibility for damage, injury, loss or expense resulting from errors and
omissions, and we reserve the right of amendment without notice
