General Instructions - Altek 211 Manual

General instructions

Connections
The Model 211 accurately simulates and reads 2, 3,
or 4 wire RTDs. It has three leads permanently
RTD CALIBRATOR attached and a socket for a fourth wire (supplied).
ALTEK MODEL 211
SIMULATE READ
The LCD indicates "4-WIRE" when the fourth wire is
HI MAX
SET READ
LO MIN
connected. The fourth wire must only be plugged in
STORE RESET
ALTEK INDUSTRIES CORP
ROCHESTER N.Y. 14623 USA
when simulating or reading 4-wire RTDs. All con-
necting wires must be the same length and of the
same material running along the same path to insure
maximum accuracy.
Two, three or four wire
Two wire RTD measurements are less accurate than
other RTD measurements because of the errors
introduced by the resistance of the lead wires. The
third wire in a three wire hookup provides the
instrumentation with a reference connection for the
lead wires. The measuring instrumentation uses this
reference to infer the actual resistance of the RTD
element without the leads. Four wire RTD measure-
ments take into account all wires other than the RTD
sensing element. This makes four wire RTDs best
suited for precisionmeasurements.
Changing RTD types
Eight RTD types or ohms may be selected each time
α=
the Model 211 is turned on. An internal DIP switch
may be used to disable the front panel selection to
1.3902
permanently lock in a single RTD type (see below).
To change RTD types:
1) Press & hold the STORE pushbutton while
switching the unit on or while a= is blinking during
the first 3 seconds after the unit is turned on.
2) Continue to hold the STORE pushbutton. The
LCD will scroll through the 8 RTD types and
ohms, displaying the Sensor material and value
for each RTD type.
3) Release the STORE pushbutton when the
desired Metal and value are displayed.
4) After 2 seconds, the Model 211 will store the RTD
type you selected and will begin Simulating or
Reading RTD signals.
5) Each additional time the Model 211 is turned on
without holding the STORE pushbutton, the newly
selected RTD type will be displayed and used. If
an incorrect type is selected, repeat steps I
through 3.
Note: For Pt 100 ohm, a= 1.3850 the word DIN
will appear on the LCD.
Operating with intermittent
excitation currents
Some transmitters, recorders and other RTD input
devices use intermittent, or pulsed, excitation
currents to measure the resistance of the RTD. The
Model 211 may be internally configured to operate
with both fixed excitation currents (default operation)
and with some intermittent currents (see Setting
Operating Mode below).
Setting operating mode (DIP switches)
*Factory Settings
(All Switches Down)
1 2 3 4 5
AUTORANGING
Switches between autoranging 0.1°/1°
(0.01Ω/0.1Ω) and fixed 1°(0.1Ω).
Fixed 1°
Autoranging*
Ω
(0.1 )
(Switch
Up)
1 1
1) Turn the Model 211 OFF
2) Remove the 4 corner screws and lift faceplate assembly out of the case.
3) Set the DIP switches for your options as diagrammed below.
FIXED RTD TYPE
Switches between a single RTD type and
RTD type selection at turn on.
Single RTD Selectable
Type RTD Types*
(Switch
Down)
2
2
Selecting °F or °C
The Model 211 may be internally configured in one
°F of three modes. The first two modes are for full-time
use in °F or full-time use in °C. The third mode
allows front panel selection of ° F or °C each time
°C
the unit is turned on. If your facility is completely in
°F or °C, set the internal DIP switches of the 211 to
operate as a dedicated °F or °C instrument (see Set-
ting Operating Mode below).
Using F/C mode
In F/C mode the temperature scale is selected by
setting the " QUIK-CHEK" switch before turning the
unit on. Place the switch to HI/MAX to select° F or
LO/MIN to select °C. If the unit is turned on with the
switch in the SET/READ (center) position the
temperature scale most recently used will be
displayed.
Note: The Model 211 will automatically convert the
temperatures in memory between °F and ° C. For
example, if 212° F is stored in HI and the Model 211
is switched to°C, 100°C will be displayed.
Selecting autoranging or 1° resolution
The Model 211 may be internally configured to
autorange or to constantly display with fixed resolu-
100.0°
tion. When autoranging is selected, the Model 211
will display temperatures with 0.1° or 1° and ohms
with 0.0Ω or 0.1Ω resolution. When fixed range is
100°
selected, the Model 211 will display temperatures
with 1° and ohms with 0.1Ω resolution.
Note: Some ranges are always displayed with 1°
resolution.
Over range/under range
Out-of-range temperatures are indicated by - - - - -
_ _ _ _ _
and OVER or UNDER on the display during READ
mode. If this occurs check for proper connections
OVER UNDER
and RTD type selection. During SIMULATE mode
excitation currents below 0.090mA are indicated by
the word SIM flashing on the display. Excitation
currents above 5.8mA are indicated by - - - - - and
SIM flashing on the display. Check for proper
connections.
Changing battery
Low battery is indicated by BAT on the LCD display.
Approximately 10 hours of operation remain before
the LCD goes blank and the Model 211 shuts itself
down. Turn the Model 211 off. Remove the four
9 Volt
corner screws and lift the unit out of the case. The
battery is fastened to the bottom printed circuit board
and is easily removed.
Note: If the new battery is installed within 30
seconds of removing the old battery the "QUIK-
CHEK" values will remain in memory.
TEMPERATURE SCALE
Switches between fixed °F, fixed °C or
°C/°F selection at turn on.
°C/°F
Fixed °F Fixed °C
Switchable*
3 4 3 4 3 4
EXCITATION CURRENT
Switches between simulating with fixed excitation
currents and excitation current selection at turn on.
Fixed Current Fixed & Intermittent
Only* Currents
5
5