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DESCRIPTION
Housed in a wall-mount, water-tight plastic enclosure, the DPS3301 Series is a powerful temperature
monitor/indicator. It accepts a single Thermocouple, RTD or Thermistor sensor input and then displays the
temperature in either degrees C or F. In addition, it also monitors a number of useful functions such as high
and low process readings, process run time, rate of process change etc.
Keys are appropriately labeled, so that the user would not have to memorize their functionality. A passcode
requirement keeps unauthorised personel from changing critical parameters such as limits, timers etc.
The DPS3301 also functions as a rate monitor, indicating instantaneous as well as average rate of
temperature change. Programmable time base allows the rate to be displayed in per second, minute, hour or
any other interval. Also, the unit can be programmed for a rate alarm. This allows control of a process if a
predetermined rate is exceeded or not achieved. The time function keeps track of process run time.
Maximum and minimum temperature readings are constantly tracked and can be helpful in quality control or
monitoring unattended processes (e.g. overnight).
Various process parameters monitored by the system may be displayed by pushing the appropriate keys on
the front panel, e.g. (Rate, Peak etc.). The respective parameter will be displayed as long as the key is kept
pressed. Alternately, if the key is pressed and then released, the unit will display a particular parameter
briefly and then go back to temperature display mode.
Four process alarms (optional) are also featured, which are programmable over the entire range of selected
input type. Also provided are two timers (optional) that work independently or in conjunction with process
limits e.g. turning on a fan ten minutes after limit 1 temperature is reached.
Process limit relays may be operated in two different modes:
1. Non-latching mode, in which the relays reset automatically as soon as the temperature
falls below the limit (minus the relay dead-band).
2. Latching mode, in which the relays stay energized even after the temperature falls below
the programmed limit. In this mode the relays will stay on until manually reset.
THERMOCOUPLE OR RTD SELECTION
DPS3301 instruments ordered for Thermocouples or RTD’s can be programmed through the front panel keys
to work with one of these specific inputs (Input type or options depend on Model number ordered).
When DPS3301 is first turned on, a ‘display segment test’ is done by briefly displaying 8.8.8.8.8.8.8.,
followed by the software revision number (rEn X.XX) and input signal type.
Input type Display shows:
J (R,S,B, rtd 385, Thermistor, J tC (r, S, B, rtd 385, tHrStor,
Millivolt, Voltage, Current) Lo VoLt, HI VoLt, CurrEnt)
K (rtd 392) Cr.AL tC (rtd 392)
T t tC
E E tC
Factory default thermocouple/RTD selection can be obtained as explained below: