Installation and Precautions
Read these instructions before installation. Configuration may be
easier before installation.
Avoid shock hazards! Turn power off before connecting or discon-
necting wiring. All wiring must be performed by a qualified electri-
cian or instrumentation technician. See diagrams on other side for
wiring examples. Consult factory for assistance.
Install or remove thermometer using a wrench on the hex fitting
only. Do not attempt to turn by forcing the housing.
Do not exceed maximum allowable housing temperature.
The spring-loaded design must be used with a thermowell.
The fixed probe design can be used in applications with low or
no material flow. Due to the hardness of 316 stainless steel, it is
recommended that a thread sealant be used to ensure leak-free
operation.
Loop Voltage
Select a loop power supply voltage and total loop resistance so that
when the loop current is 20 mA, the transmitter will have at least
8 VDC at its terminals. For correct operation, the terminal voltage
must never fall below 8 VDC. Below about 7.8 VDC erratic operation
may occur. Too large a loop resistance will cause the output to “lim-
it” or saturate before reaching its full 20 mA output. The minimum
loop supply voltage may be calculated from the formula:
Vmin = 8V + (20mA x Total loop resistance)
This is an indication that the loop supply/resistance may not allow
adequate headroom for reliable operation. This should never occur
in normal use. If it does, examine the loop supply/resistance.
Normal Operation
To turn the unit on, apply power. The ThermoPro is designed for
continuous operation. Warm-up time is negligible.
When power is first applied, the ThermoPro will set the loop current
to maximum and check the voltage available. If there is sufficient
voltage available to power the unit, all active segments will be dis-
played briefly. Then the display and the loop current will correspond
to the temperature of the RTD probe.
At power-up, if the voltage available is not suffi-
cient, only the low power indicator will be displayed.
This is an indication that the loop impedance is too high or the
loop power supply voltage is too low.
After successful power-up, if the loop voltage falls below the mini-
mum required for reliable operation, the ThermoPro will continue to
indicate the temperature of the RTD with the low power indicator
blinking at a slow rate.
Out-of-Range Indications
RTD over-range condition >392.0°F or >200.0°C
RTD under-range condition <–58.0°F or <–50.0°C
If the RTD temperature is outside of the extrapolated range, a burnout
condition is assumed.
1. . . . if upscale burnout is selected.
The loop current will be at 20 mA.
–1. . . . if downscale burnout is selected.
The loop current will be 4 mA.
User Configuration Mode
From the normal operating mode, press and
hold sand then press the TEST button until
CFG is displayed.
When the buttons are released the upper display
will indicate _ _ _ _ with the left position blink-
ing, and the lower display will indicate PASS.
Pressing and releasing TEST exits configura-
tion. The unit will automatically revert to normal
operation if no buttons are operated for approxi-
mately 15 seconds.
Enter the user-defined pass code (3510 fac-
tory default).
Use the sand tbuttons to increase or de-
crease the numerical value.
Press and release the TEST button to index to
the next position.
If an incorrect pass code was entered, the
gauge will exit to the normal operating mode.
Press and release the TEST button to proceed to
the configuration sequence.
cecomp.com
1220 American Way Libertyville, IL 60048
Phone: 800-942-0315 Fax: 800-949-7502
Cecomp®ThermoPro®Digital Temperature Transmitters T16L
BSOLUTE ROCESS NSTRUMENTS, Inc.
Division of
ALARM 1
ALARM 2
DEG F
DEG F
Change Pass Code
From the normal operating mode, press and
hold sand then press the TEST button until
CFG is displayed.
When the buttons are released the upper display
will indicate _ _ _ _ with the left position blink-
ing, and the lower display will indicate PASS.
Pressing and releasing TEST exits configura-
tion. The unit will automatically revert to normal
operation if no buttons are operated for approxi-
mately 15 seconds or if an incorrect pass code
was entered.
Enter pass code 1220 (factory default).Use the
sand tbuttons to increase or decrease the
numerical value. Press and release the TEST
button to index to the next position.
After 1220 has been entered press and release
the TEST button to proceed to the pass code
change sequence.
The present pass code will be displayed.
Operate the sor tbutton to select the first
character of the new pass code.
Press and release the TEST button to proceed
to the next character. Repeat until the new pass
code is complete and the last number stops
blinking. To correct any entry errors press the
sor tbutton again. Write down the new pass
code in a secure place.
To exit, press and hold the TEST button until the
display indicates - - - -. The unit will restart in
the normal mode.
Calibration Mode
The ThermoPro is factory calibrated and there is generally no need
to alter calibration settings. Required calibration equipment includes
a temperature reference and milliamp meter of at least four times
the unit’s accuracy, a dry-block calibrator or temperature controlled
bath, and a DC loop power supply. Connect the ThermoPro accord-
ing to the current loop wiring diagram with a
milliamp meter in series with the circuit.
Temperature calibration is performed at ice point
and at a temperature above ice point. The full
scale temperature is normally used for the sec-
ond point. However, if a particular temperature is
of critical interest, it may be used instead for best
accuracy at that point.
From the normal operating mode, press and
hold the tand then press TEST.
Release buttons when CAL is shown.
Enter the user-defined pass code as described
under User Configuration Mode.
Upon successful pass code entry, the upper
display will indicate the RTD probe tempera-
ture. The lower will alternate CAL and the
temperature units.
Temperature Scale Selection
The upper display will be blank, and the lower
section will display DEG C or DEG F.
To change from Celsius to Fahrenheit, press
and release the sbutton. The lower display
will change to DEG F.
To change from degrees Fahrenheit to Celsius,
press and release the tbutton. The lower
display will change to DEG C.
Whether or not a change is made, the Test value
will be reset to 0.0°C or to 32.0°F.
Press and release the TEST button to move on
to the next parameter.
Upscale/Downscale Burnout
The upper display will be blank, and the lower
display will indicate UP BO or DN BO.
To change from upscale burnout to downscale
burnout, press and release the tbutton. The
display will change to DN BO.
To change from downscale burnout to upscale
burnout, press and release the sbutton. The
display will change to UP BO.
Press and release the TEST button to move on
to the next parameter.
Output Range
The upper display will indicate the temperature
corresponding to a loop current of 4 mA. The
lower display will indicate RNGLO.
To change the temperature corresponding to a
loop current of 4 mA, use the sand tbuttons
to set the desired value. Press and release the
TEST button to move on to the next parameter.
The upper display will indicate the temperature
corresponding to a loop current of 20 mA. The
lower display will indicate RNGHI.
To change the temperature corresponding to a
loop current of 20 mA, use the sand tbut-
tons to set the desired value.
Press and release the TEST button to save
the configuration parameters and restart the
gauge. The configuration parameters will not
be saved if the procedure is interrupted before
completion.
Output Test Level
To set the test output level, press and hold the
front-panel TEST button and press the sand
the tbuttons to adjust the test output to the
desired temperature setting. This setting is
stored in non-volatile memory.
When the TEST button is held depressed, the
display and loop current are switched, inde-
pendent of the RTD temperature, to a level de-
termined by the test setting. When the button is
released, normal operation is resumed.
Loop Calibration
Note: to store the calibration parameters and
exit calibration mode at any time, press and
hold the TEST button for more than 2 seconds
until the display indicates - - - - .
Press the TEST button and release it when the
display indicates LCAL. During loop calibration
only the loop current will change. The pre-
configured temperatures will not change.
The upper display will indicate the temperature
corresponding to 4 mA loop current. The lower
display will alternate between CAL and 4 MA.
Use the sand tbuttons to adjust the actual
loop current to 4 mA.
Press the TEST button and release it when the
display indicates HCAL.
The upper display will indicate the pre-config-
ured temperature corresponding to a 20 mA
loop current. The lower display will alternate
between CAL and 20 MA.
Use the sand tbuttons to adjust the actual
loop current to 20 mA.
Ice Point Calibration
Press the TEST button and release it when the
display indicates CAL.
Apply 0.0°C or 32.0°F to the RTD. At approxi-
mately 12°C (or 54°F), the ice-point calibra-
tion mode will automatically be selected.
The lower display will alternate between ICE0
and DEG C or DEG F. Use the sand tbuttons
to adjust the upper display to indicate 0.0°C
or 32.0°F.
Second Point Calibration
Apply full-scale temperature to the RTD. The
lower display will alternate between CAL and
DEG C or DEG F. Use the sand tbuttons to
adjust the upper display to indicate the applied
temperature value.
To store the calibration parameters and exit
calibration mode, press and hold the TEST but-
ton until the display indicates - - - - . The unit
will restart in the normal mode.
PASS
____
t
s
TEST
Increment
up or down
Move to
next #
PASS
3___
t
s
TEST
*
*
*
PASS
35 i0
t
s
TEST
*
t
s
TEST
CFG
*
2
*
1
—or—
deg f
t
s
TEST
*
deg C
t
s
TEST
*
t
s
TEST
*
—or—
dn bo
t
s
TEST
*
up bo
t
s
TEST
*
t
s
TEST
*
Increment
up or down
Move to
next #
rnglo
32.0
t
s
TEST
*
*
*
Increment
up or down
Move to
next #
rnglo
2 i2.0
t
s
TEST
*
*
*
ThermoPro
will restart
t
s
TEST
*
deg f
ioo.o
t
s
TEST
*
Increment
up or down
Press &
hold
deg f
ioo.o
t
s
TEST
*
*
*
Increment
up or down
Move to
next #
PASS
35 i0
t
s
TEST
*
*
*
t
s
TEST
Cal
*
2
*
1
deg f
35 i0
t
s
TEST
cal
t
s
TEST
lcal
75.0
*
hcal
t
s
TEST
*
cal
75.0
t
s
TEST
*
Increment up or down
deg f
2 i2.0
t
s
TEST
*
*
cal
t
s
TEST
- - - -
*
deg F
32.0
t
s
TEST
*
*
ice
Increment up or down
20 ma
2 i2.0
t
s
TEST
*
*
cal
Increment up or down
4 ma
32.0
cal
t
s
TEST
*
*
Increment up or down
PASS
____
t
s
TEST
Increment
up or down
Move to
next #
PASS
i___
t
s
TEST
*
*
*
PASS
i220
t
s
TEST
*
t
s
TEST
CFG
*
2
*
1
udpcd
35 i0
t
s
TEST
Increment
up or down
Move to
next #
*
*
*
t
s
TEST
- - - -
*
