Cooper Instruments DFI-200 Installation Manual

DFI 200

Hand Held Portable Indicator

Operation and Instruction Manual

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CONTENTS

1.0 Introduction...........................................................................................................................3

2.0 Electrical Connections .........................................................................................................3

3.0 Explanation of Functions.....................................................................................................4

3.1 Error Messages ................................................................................................................................................10

4.0 Function Table ....................................................................................................................11

5.0 External Memory.................................................................................................................11

6.0 Serial Communications......................................................................................................12

7.0 Specifications .....................................................................................................................15

8.0 Warranty ..............................................................................................................................16

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1.0 INTRODUCTION

This manual contains information for the operation of t he DFI 200 hand held load cell monitor. The DFI 200 is a
high accuracy meter with the capability of high-speed sampling. Sample rate is programmable in steps from 5 to
100 samples per second. The instrument has a full-scale range of 0.5mV/V to 100mV/V. Up to 3 separate
calibration values can be stored internally allowing switching between 3 load cells, or 3 scaling ranges, without the
need to recalibrate each time.

When used with external memory options the DFI 200 can “read” the calibration scaling values stored in memory in
the load cell connector shell. The instrument can then display the correct scaling value for each individual load cell,
which uses a memory device without the need for re-calibration.

The DFI 200 is supplied with RS232 communications as standard but by default this is disabled. See “Serial
communications” chapter for DIP switch settings required for enabling the serial communications.

The DFI 200 has various calibration method options. It may be calibrated by applying two know weights to the load
cell or by entering the mV/V value for the load cell or via a single offset value.

The DFI 200 is suitable for measuring weight, pressure, force, torque etc. from a 4-wire mV output transducer.
Calibration, and set up functions are easily achieved via front pushbuttons.

2.0 ELECTRICAL CONNECTIONS

Power for the DFI 200 is provided by a 9VDC (216) battery. The battery cover is located at the underside of the
case. External connections to the DFI 200 are made via a 9 pin “D” male connector. Electrical connections are as
shown below. See "External memory" chapter for details of the optional external memory chip.

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3.0 EXPLANATION OF FUNCTIONS

The DFI 200 setup and calibration functions are configured through a push button sequence. Two levels of access
are provided for setting up and calibrating: -

mode (simple push button sequence) allows access to calibration channel selection, display rounding,

decimal point and digital filter settings only.

mode (power up sequence plus push button sequence) allows access to all functions including calibration

parameters.

Once
push button, until the required function is reached. Changes to functions are made by pressing the

button (in some cases both simultaneously) when the required function is reached. Any changes to a function will
not be saved until the

or mode has been entered you can step through the functions, by pressing and releasing the

or push

button is pressed to accept the change.

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Function Description

Cell calibration selection – selects one of the three possible calibration channels (
also if the optional external memory chip is used – see “External memory” chapter). The

function allows the instrument to be calibrated to up to 3 different load cells and hold the
calibration values in internal memory. Alternatively 3 different calibration scaling values may be
entered for a single cell, allowing the same cell to display in different units e.g. Kilonewtons,
Kilograms & Tonnes. The user may select the load cell to be used vial this
“User” pushbutton if the pushbutton has been programmed for this purpose (see
scale any of these independent calibration memories you may use either the

/ methods or the / method. Simply select the required cell number prior to
scaling then scale using whichever calibration method best suits the application.
The channel selected will always default to
In addition to independent calibration scalings for each channel selected each channel can be
assigned different decimal point (
rate (
Display rounding 0 displays and sets the display rounding value. This value may be set to 1-5000
displayed units. Display rounding is useful for reducing the instrument resolution without loss of
accuracy in applications where it is undesirable to display to a fine tolerance. (example: if set to 0.5
the instrument will display in multiples of 0.5 ie. 0, 0.5, 1.5, 2.0 etc).
Unit address – this function is used to display or set a unit address to one or more optional external
memory devices. For identification purposes each device should be allocated an address
if more than one external memory is used. When a sensor with a memory chip is plugged in the

Cont.

function can be used to view the address of the memory device. The address can be set from

1 to 250. If address 255 is seen this indicates that the device has not had yet had an address set. If a

, ,

function or via the

function). To

/ &

(or if external memory is used) at switch on.

), digital filter ( ), mV/V input range ( ) and sample

) settings.

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Function Description

memory device has had an address set then the address can be viewed or altered at this function.
The procedure for setting or altering an address is as follows.

1. The

function must be set to either i.e. a memory device must be connected

2. With the external memory device connected enter function mode and step through to the
function.

3. Use the

or arrow to select the required address for that chip then press to accept

the change.
The address selected will now be stored in that memory device.
The same address can be allocated to more than one memory device and the address of a device
can be changed at any time by following steps 1, 2 & 3 above.

Decimal point selection – displays and sets the decimal point. By pressing the

or pushbuttons
the decimal point position may be set. The display will indicate as follows: 0 (no decimal point), 0.1 (1
decimal point place), 0.02 (2 decimal point places) or 0.003 (3 decimal point places). 3 decimal
places is the maximum for both 4 & 4½ digit displays.
Digital filter – displays and sets the digital filter value. Digital filtering is used for reducing
susceptibility to short term interference. The digital filter range is selectable from 0 to 8, where 0 =
none and 8 = most filtering. A typical value for the digital filter would be 3. The digital filter uses a
weighted averaging method of filtering which will increase the display update time at higher settings.

mode functions

Entry via mode (see first page of this chapter) must be made in order to view and adjust the functions that follow.

Full scale mV/V output of transducer – displays and sets the full scale mV/V range to suit the load
cell transducer usable range and is selected in steps as follows:

0.5, 1.0, 2.5, 5.0, 10, 20, 40, and 80
If there is no exact match to your transducer choose the next highest setting e.g. if your load cell has
2mV/V output then choose 2.5 as the range setting. Choosing a setting higher than required will
result in a loss of resolution. Choosing a setting lower than required may result in the overload
display “ - - - -“
Sample rate – displays and sets the ADC sample rate from 5 to 100 samples per second and may be
selected in steps as follows:
5, 10, 15, 20, 30, 40, 50, 60, 80 and 100
For best resolution choose the lowest acceptable sample rate. A resolution table can be found in the
Specifications chapter.
User pushbutton function – in normal measurement mode the User push button can be programmed
to operate in one of the modes described below. In

or modes pressing the User button
will cause the instrument to immediately return to normal measurement mode. Any changes to the
function selected when the button was pressed will not be saved.
Displays and sets the user pushbutton function. This function may be set to any one of the following
shown in the table below:

Function Description

No function
Push button tare – the pushbutton must be pressed for 2-3 seconds to perform a tare
operation. When tare is selected you can toggle between the nett, tare and gross
displays via the User pushbutton. The message
the measurement value.

Display hold – Press the User button momentarily to hold the display the message

, or will precede

will flash every few seconds. Press the button to reset back to normal
display. If the User button is held pressed for 2-3 seconds the held value in memory
will be reset and a the current value will be held. The display will automatically reset to
normal measurement after 20 seconds.
Peak hold – Press the User button momentarily to hold the peak value display the

message

will flash every few seconds. Press the button to reset back to
normal display. If the User button is held pressed for 2-3 seconds the peak value in
memory will be reset and a the current value will be become the new peak value. The
display will automatically return to normal measurement after 20 seconds.
Change calibration channel – Allows toggling between input readings for calibration

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