General instructions
Setting operating mode (DIP switches)
Pulsed excitation currents
Some distributed control systems, recorders, trans-
mitters and other RTD input devices use intermittent,
or pulsed, excitation currents to measure the resis-
tance of the RTD. The Model 111 will not simulate
correctly with these devices (see Calibrating
Additional Instruments on page one).
SELECTING °F OR °C
The Model 111 may be internally configured in one
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 the
unit is turned on. If your facility is completely in °F or
°C, set the internal DIP switches of the 111 to
operate as a dedicated °F or °C instrument (see Set-
ting Operating Mode below).
Autoranging or fixed 1° resolution
The Model 111 may be internally configured to
autorange or to constantly display with fixed resolu-
tion. When autoranging is selected, the Model 111
will display temperatures with 0.1° or 1° and ohms
with 0.01 ohm or 0.1 ohm resolution. When fixed
range is selected, the Model 211 will display temper-
atures with 1° and ohms with 0.1 ohm resolution.
Note: Simulation of Pt 100 ohm RTD into devices
with greater than 1.1 mA of excitiation current (and
some custom ranges) is 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
and RTD type selection. During sinulate 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 the 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 111 shuts itself
down. Turn the Model 111 off. Remove the four
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 sec-
onds of removing the old battery the “Quik-Chek”
values will remain in memory.
Connections
The Model 111 accurately simulates and reads 2 and
3 wire RTDs. It has three leads permanently
attached which are terminated with spade lugs. All
connecting wires must be the same length and of
the same material running along the same path to
insure maximum accuracy.
Two or three wire
Two wire RTD measurements are less accurate than
other RTD measurements because of the errors in-
troduced by the resistance of the lead wires. The
third wire in a three wire hookup provides the instru-
mentation with a reference connection for the lead
wires. The measuring instrumentation uses this ref-
erence to infer the actual resistance of the RTD
element without the leads.
Turn on
Each time the Model 111 is turned on, the LCD will
display all segments for about 1 second. It then dis-
plays the currently selected RTD or Ohms mode for
approximately 3 seconds. The currently selected
temperature scale of °C or °F will then display for
about 3 seconds. Depending on the configuration,
RTD, Ohms, °C or °F may be selected during turn-
on.
1) Move the power switch to SOURCE or READ
2) All segments on the LCD are turned on during
self test
3) The display will indicate the selected RTD type
for 3 seconds. Press the SETUP pushbutton to
change between RTD and Ohms (based on con-
figuration).
4) The display will indicate the selected temperature
scale for 3 seconds. Press the SETUP
pushbutton to switch between °C & °F (based on
configuration).
5) The Model 111 will now Simulate or Read RTD or
Ohms.
Depending on the configuration of the DIP switches
the user prompts for RTD, Ohms, °C and °F may be
skipped during turn-on.
The three “QUIK-CHEK” temperature values will be
the same as previously stored. If a change is made
between Ohms and RTD mode 100 Ohms will be
stored for Ohms and 0°C (32°F) will be stored in all
three “QUIK-CHEK” positions.
Note: The Model 111 will automatically convert the
temperatures in memory between °F and °C. For ex-
ample, if 212.0°F is stored in HI and the Model 111
is switched to °C, 100.0°C will be displayed.
°F
°C
100°
100.0°
*Factory Settings (All switches down)
Fixed °F
Fixed °C
°C/°F Switchable*
Fixed 1°
(Switch
Up)
(Switch
Down)
1
Fixed 0.1°*
1
2
Fixed RTD or Ohms
Selectable RTD/Ohms*
Full time RTD or ohms
Switches between full time RTD or Ohms
Mode (whichever is currently selected) and
selectable modes at turn on.
Autoranging
Switches between autoranging
0.1°/1° (0.01 Ohm/0.1 Ohm) and
fixed 1° (0.1 Ohm).
TEMPERATURE SCALE
Switches between fixed °F, fixed
°C or °C/°F selection at turn on.
1 2 3 4
1) Turn the Model 111 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
2
3 4
3 4
3 4
9 Volt
_ _ _ _ _
OVER UNDER
