D2605-01-02
DM650TM USER GUIDE
BATTERY POWERED DIGITAL THERMOMETER
WITH RELAY TRIP AND LOGGING FUNCTION
Important - Please read this document before installing.
Every effort has been taken to ensure the accuracy of this document, 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.
IMPORTANT - CE & SAFETY REQUIREMENTS
The instrument is designed to be directly attached to the sensor probe assembly.
Remote Probes may be used but the user must ensure all sensor and cable entries
maintain environmental protection to at least IP65 rating.
To maintain CE EMC requirements, input wires must be less than 3 metres.
The product contains no serviceable parts, or internal adjustments. No attempt must be
made to repair this product. Faulty units must be returned to supplier for repair.
This product must be installed by a qualified person. All electrical wiring must be
carried out in accordance with the appropriate regulations for the place of installation.
Before attempting any electrical connection work, please ensure the battery is removed
ABSOLUTE MAXIMUM CONDITIONS (To exceed may cause damage to the unit).
Battery Voltage
± 3.7 VDC (Protected for over-voltage and reverse connection)
Input Voltage
± 1 V between any terminals
Ambient
Temperature (-30 to 70) °C, Humidity (10 to 95) % RH (Non-
condensing)
Relays
50 VDC 40 VAC RMS
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1~DESCRIPTION
.
The DM650TM battery powered indicator accepts RTD or thermocouple temperature
sensors and displays the sensor temperature in °C or °F on a 6-digit LCD display. The
instrument offers an advanced display mode allowing the user to also display one or
two (1 to 32) character messages. Additional to the messages, the user may select an
alert event to occur when the temperature is within a band. The change-over relay can
be used together with the messaging and alert to provide switching at user-set switch
points. In addition to this, on board datalogging is also available to record process
details at up to 5000 points.
2~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~SPECIFICATION.
Refer to data sheet for full specification.
Factory default
Pt100, °C, 0.0°C offset, relay not set
4~ INSTALLATION AND WIRING.
4.1~MECHANICAL.
The instrument is a high accuracy digital thermometer. In order to ensure correct
operation, the following must be observed:
The product must be stored in a dry clean environment and remain in original
packaging prior to installation.
The instrument must not be installed adjacent to electro-mechanical starters,
controllers, thyristor power units or electrical switch gear.
Any cleaning of the instrument must be done using a mild detergent and soft cloth. No
solvents or abrasive cleaners should be used.
Stated ambient operating conditions must not be exceeded. Battery life will reduce with
higher ambient temperature operating conditions.
4.2~ELECTRICAL.
For a wiring diagram please refer to the rear panel of the DM650TM inside the
case housing.
Two-part connectors are used for input and relay connections, allowing the unit to be
easily removed from the housing for reprograming or data download if this is not
possible in situ. On insertion of battery the unit will run through a power up check;
during this time the relay may change state.
IMPORTANT: Always remove battery before any wiring takes place. Gain access to
the connectors and battery holder by twisting cap to release front panel assembly from
case.
RTD: For best result we recommend using three wire connection; this method
compensates for any lead resistance between the sensing element and instrument.
Two wire connection is possible: refer to connection diagram on the instrument
protection panel.
THERMOCOUPLE: T/C wire type must be maintained from the sensor element to the
instrument terminals. The terminals are effectively the cold junction point and can be
displayed as “Case” temperature.
RELAY CONNECTION: A relay with changeover contacts is available. Screw terminals
are provided for connection for wire size 16 to 20 AWG. The relay contacts are rated at
48 VDC 28 VAC RMS @ 1 A (5 mA minimum current) see DM650TM data sheet.
BATTERY: To remove battery, use screw driver to ease the positive end of the battery
out of holder. Insert new battery negative end first then press into place. (Observe
polarity). Battery type 3.6 V Lithium (2.4 A/Hr) CR14505 (IEC) AA case style. Please
dispose of the battery in a responsible way.
WARNING
For configuring, reading live data or reading logged data if using a grounded
thermocouple probe on the input, it is important not to connect the programming USB
lead to a mains powered computer. It is possible to damage the instrument if
connected in this way.
To avoid damage use one of the following methods:
•
Disconnect the probe before configuration, reconnect the probe after
configuration.
•
Ensure the probe and DM650 housing are not in contact with any conductive
parts during configuration.
•
Use a laptop type computer running from its battery power supply, not connected
to a mains supply. This is recommended for reading lived data or offsetting a unit
if already installed in the field.
•
Use a USB isolator between the computer and the DM650.
5~USER CONFIGURATION.
IMPORTANT
READ COMPLETE SECTION BEFORE ATTEMPTING CONFIGURATION.
PARTICULAR CARE SHOULD BE TAKEN REGARDING TIMEOUTS IN MENU 2 & 3
The instrument is provided with a USB interface for direct connection to a PC. Free
software USBSpeedLink is available. Please refer to the USBSpeedLink software for
further information on configuration. The software can be downloaded from
www.status.co.uk.
DISPLAY: The display provides six 14 segment characters for display of temperature
and alpha-numeric messages, together with a 8 segment bar graph and six icons. The
display is capable of operating in an ambient temperature range of (-30 to 70) °C, but
at temperatures lower than -5 °C (due to the slower LCD speed) scrolled messaging is
not practical, so the display will automatically revert to basic mode showing
temperature. The display’s high contrast, coupled with a digit height of 7.9 mm, offers
clear readouts at low as well as high ambient light and direct sunlight.
The display layout is as follows:
9
1
2
3
4
6
8
7
8
