aci RTD Freezer Series User manual

Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: [phone] | Website: workaci.com
Page 1
Version: 5.0
I0000822
FIGURE 1: FREEZER PROBE
DIMENSIONS
RTD FREEZER TRANSMITTER
SERIES SENSOR
Installation & Operation Instructions
Phone: [phone]
Website: workaci.com
GENERAL INFORMATION
The ACI RTD Freezer Series sensors and transmitters
are single point sensors that output 4-20 mA with an
optional voltage signal output of 1-5VDC or 2-10VDC
signal to BAS or controller. All ACI/TT and TTM
temperature transmitters can be powered from either
an unregulated or regulated 8.5 to 32 VDC power
supply.
MOUNTING INSTRUCTIONS
ACI’s Freezer Series sensor includes a transmitter
with enclosure and a 3/16” diameter stainless steel
probe. The transmitter needs to be mounted in
environments with ambient temperatures above -40
°C (-40 °F) - see SPECIFICATIONS (p. 4). The freezer
probe’s operating temperature range is -200 °C (-328
°F) to 200 °C (392 °F).
TRANSMITTER ENCLOSURE MOUNTING
The transmitter must be mounted outside of the
freezer/cooler. On Vertical units, mount on the top of
the freezer see Figure 3 (p. 2). On Horizontal units,
mount on the backside or side of the freezer. Attach
the base directly to the wall by using double sided
tape.
WIRE INSTALLATION
ACI recommends installing the wire through the
door seal, probe access port, or cooler wall. On
horizontal units, the preferred method is using the
rear door seal as shown in Figure 4 (p. 2). On vertical
units, remove the rear panel. There is typically a
probe access hole. Probe and wires can be ran into
that access hole. Alternatively, you can drill a hole
just larger than the diameter of the wire (0.125”
(3.175 mm)) through the wall. From inside the
cooler/freezer, push the wire through the hole. Use
mounting clips to secure the wire to the interior wall
or shelving. Use silicone caulking to seal the hole
around the wire.
SENSOR MOUNTING
Bullet Probe sensors can be wrapped around a shelf
as shown in Figure 5.
FIGURE 2: ENCLOSURE
DIMENSIONS
NEMA 4X (-4X)
GALVANIZED (-GD)
BELL BOX (-BB)
4.20"
(106.68 mm)
2.33"
(59.18 mm)
4.56"
(115.82 mm)
2.82"
(71.62 mm)
2.55"
(64.77 mm)
2.00"
(50.80 mm)
1.62"
(41.14 mm)
2.21"
(56.13 mm)
3.70"
(93.98 mm)
0.86"
(21.84 mm)
50.78
2.00
.1875" (4.76 mm)
DIA. NOMINAL

Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: [phone] | Website: workaci.com
Page 2
Version: 5.0
I0000822
FIGURE 3: ENCLOSURE
MOUNTING
FIGURE 6: SENSOR MOUNTING
ON WALL
VAC
SENSOR MOUNTING (Continued)
Alternative, the senor may be mounted on walls using a 1/4”mounting clip (ACI Item #108169). The sensor
should be mounted in an area where air circulation is well-mixed and not blocked by obstructions. Slide
the sensor probe through the mounting clip - see FIGURE 6. Drill a 1/4” screw through the socket and
tighten to the wall. If a thermal buer is required, use a glycol kit (ACI Item #130127). Drill pilot holes for the
provided mounting screws. Use the mounting clip holes as a guide - see FIGURE 7. Drill the #10-16 x 1/2“
screws through the bracket holes and fasten it to the wall. Insert the bottle into the bracket, and make sure
it is seated securely.
Note: When using in tank or glycol application, the
sensor cannot be fully submerged. The end of the probe
must be kept above the liquid.
BULLET PROBE
1/4” MOUNTING CLIP
FIGURE 7: GLYCOL SENSOR
w/ BRACKET
SENSOR WIRES
GLYCOL BOTTLE AND
STANDARD 4”SENSOR PROBE
STEEL MOUNTING
BRACKET
FIGURE 4: WIRE ROUTING
FIGURE 5: SENSOR MOUNTING WIRING INSTRUCTIONS
PRECAUTIONS
• Transmitter must be powered by 24 VDC only.
• Remove power before wiring. NEVER connect or
disconnect wiring with power applied.
• When removing the shield from the sensor end,
make sure to properly trim the shield to prevent
any chance of shorting.
• When using a shielded cable, ground the shield
ONLY at the controller end. Grounding both ends
can cause a ground loop.

Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: [phone] | Website: workaci.com
Page 3
Version: 5.0
I0000822
WIRING INSTRUCTIONS
(Continued)
• If the 24 VDC power is shared with devices
that have coils such as relays, solenoids, or
other inductors, each coil must have an MOV,
DC Transorb, Transient Voltage Suppressor
(ACI Part: 142583), or diode placed across the
coil or inductor. The cathode, or banded side
of the DC Transorb or diode, connects to the
positive side of the power supply. Without
these snubbers, coils produce very large
voltage spikes when de-energizing that can
causemalfunctionordestructionofelectronic
circuits.
Open the cover of the enclosure. ACI recommends
16 to 26 AWG twisted pair wires or shielded cable for
all transmitters. Twisted pair may be used for 2-wire
current output transmitters or 3-wire for voltage
output. Refer to FIGURE 8 (right) for wiring
diagrams. All wiring must comply with local and
National Electric Codes. All ACITT and TTM tempera-
ture transmitters can be powered from either an
unregulated or regulated 8.5 to 32VDC power
supply. The TT and TTM DO NOT support an AC
input. All TT and TTM temperature transmitters are
reverse polarity protected. After wiring, attach the
cover to the enclosure.
Note: All RTD’s are supplied with (2) or (3) ying
lead wires. ACI’s transmitters are supplied with a 2
pole terminal block for RTD sensor connections.
When wiring a 3 wire RTD, connect the (2) common
wires (same color) together into the same terminal
block.
The minimum voltage at the transmitter power
terminal is 8.5V after load resistor voltage drop.
•249 Ω load resistor (1-5 VDC output) = 13.5 V min supply
voltage
•499 Ω load resistor (2-10 VDC output) = 18.5 V min supply
voltage
Note: Adding extra wire length between the sensor
and transmitter board may aect accuracy.
FORMULA FOR NUMBER OF TRANSMITTERS
Several transmitters may be powered from the same
supply as shown in FIGURE 9 (p. 4). Each transmitter
draws 25mA; refer to the following equation to
obtain the number of permissible transmitters: [#
Transmitters] = [Current] / (25 mA).
+VDC (Red Wire)
4 to 20mA Output
(White Wire)
RTD Wires
(100 Ohm RTD Brown Wires)
(1K Ohm RTD Black Wires)
+VDC (Red Wire)
GND (White Wire)
Voltage Output
(Yellow Wire)
(1 to 5, 2 to 10VDC)
RTD Wires
(100 Ohm RTD Brown Wires)
(1K Ohm RTD Black Wires)
Current Output
(4 to 20 mA)
Current Output
(4 to 20 mA)
+VDC
4 to 20mA Output
Voltage Output
(1 to 5, 2 to 10VDC)
Voltage Output
(1 to 5, 2 to 10VDC)
+VDC
GND
Voltage Output
(1 to 5, 2 to 10VDC)
+-GND VOUT RTD
+-RTD
SPAN
ZERO
SPANZERO
SPAN
ZERO
SPANZERO
POTTED UNITS
STANDARD UNITS
FIGURE 8: WIRING DIAGRAMS

Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: [phone] | Website: workaci.com
Page 4
Version: 5.0
I0000822
FIGURE 9: MULTIPLE TRANSMITTER CONNECTIONS
P
ower Supply
+ -
+ -
+ -
Temp.Transmitter #1
Temp.Transmitter #N
Temp.Transmitter #2
-VDC+
Controller
Gnd AI1 AI2 AI3
= Connections
AI
1 = Controller Input #1
AI
2 = Controller Input #2
AI
3 = Controller Input #3
SOLUTION(S)
•No power to board - check voltage at power terminal - should be
between +8.5 and 32 VDC.
•RTD wires shorted. Disconnect sensor wires from terminal block and
check with ohmmeter. Reading should be close to either 100 Ωor
1000 Ω.
•RTD Improper range of transmitter (too low). Check current or
voltage (model dependent) - should be between 4-20 mA, 1-5 V, or
2-10 V.
•RTD opened. Disconnect sensor wires from terminal block and check
with ohmmeter. Reading should be close to either 100 Ωor 1000 Ω.
•Improper range of transmitter (too high). Check current or voltage
(model dependent) - should be between 4-20 mA, 1-5 V, or 2-10 V.
•Sensor check: Disconnect sensor wires from terminal block and
check with ohmmeter. Compare the resistance reading to the
Temperature vs Resistance curves located on ACI’s website.
•Transmitter check: Make sure sensor wires are connected to
terminal block. Determine that the proper output is being
transmitted based on predetermined span:
1. Go to ACI Website, Span to Output Page:
http://www.workaci.com/content/span-output
2. Enter the low end of the span
3. Enter the high end of the span
4. Click on the output of the transmitter. This will generate a span
to output chart.
5. Measure output of transmitter.
6. Compare measured output to calculated output
•Input power must be clean. Use twisted wires or shielded cable. RF
resistant power supply. Use a shielded cable to connect the sensor -
connect the shield to ground. Encase the board in a RF shielded enclosure.
TROUBLESHOOTING
PROBLEM
No Reading
Reading too Low
Reading too High
Reading is Inaccurate
RF Interference

W.E.E.E. DIRECTIVE
At the end of their useful life the packaging and product should be disposed of via a suitable recycling
centre. Do not dispose of with household waste. Do not burn.
WARRANTY
The ACI Freezer Temperature Series temperature sensors are covered by ACI’s Five (5) Year Limited Warranty,
which is located in the front of ACI’S SENSORS & TRANSMITTERS CATALOG or can be found on ACI’s website:
www.workaci.com.
PRODUCT SPECIFICATIONS
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: [phone] | Website: workaci.com
Page 5
Version: 5.0
I0000822
SENSOR NON-SPECIFIC
Storage Temperature Range:
Operating Humidity Range:
Lead Length | Cable Diameter:
Lead Wire Insulation | Jacket Color:
Conductor Size | Conductor Material:
Probe Material | Length | Diameter:
Enclosure Specications:
TRANSMITTER
Transmitter SupplyVoltage | Supply Current:
Output Signals:
Calibrated Transmitter Accuracy | Linearity:
Transmitter Operating Temperature Range:
Operating Humidity Range:
Calibrated Temperature Spans:
Temp Drift
Warm Up Time | Drift
Connections | Wire Size
Terminal Block Torque Rating
SENSOR
Sensor Type | Sensor Curve:
DIN Standard |Temp Coecient
Response Time
Sensor Output @ 0°C (32°F):
Sensor Tolerance Class | Accuracy:
Sensor OperatingTemperature Range:
-40 to 80 °C (-40 to 176 °F)
10 to 95% RH, non-condensing
10’ (3.05 m) or 30’ (9.15 m) | 0.106” nominal (2.69 mm)
FEP/FEP (Teon) Jacketed Cable | White
24 AWG (0.51 mm) | Silver Plated Copper
316 Stainless Steel | 2”(50.8 mm) | 0.1875”(4.76 mm) nominal
“-GD”: -40 to 100 °C (-40 to 212 °F); Galvanized Steel; NEMA 1 (IP10)
“-BB”: -40 to 85 °C (-40 to 185 °F); Aluminum; NEMA 3R (IP 14)
”-4X”: -40 to 70 °C (-40 to 158 °F); Polystyrene Plastic, UL94-V2, IP66 (NEMA 4X)
+8.5 to 32 VDC (Reverse Polarity Protected) | 25 mA minimum
250 Ω Load (1-5VDC): +13.5 to 32VDC | 500 Ω Load (2-10VDC): +18.5 to 32 VDC
Current: 4-20 mA (2-Wire Loop Powered) | Voltage: 1-5VDC or 2-10 VDC (3-Wires)
T. Spans < 260 °C (500 °F): +/- 0.2% | T. Spans > 260 °C (500 °F ): +/- 0.5%
-40 to 85 °C (-40 to 185 °F)
0 to 90%, non-condensing
Min. T. Span: 28 °C (50 °F) | Max T. Span: 426 °C (800 °F )
T. Span < 38 °C (100 °F): +/- 0.04% | T. Span > 38 °C (100 °F): +/- 0.02%
10 Minutes | +/- 0.1%
ScrewTerminal Blocks | 16 AWG (1.31 mm2) to 26 AWG (0.129 mm2)
0.5 Nm nominal
Platinum RTD | Linear, PTC (Positive Temperature Coecient)
DIN EN 60751 (IEC 751) | 3850 ppm / °C
15 Seconds nominal
A/TT/TTM100-LTS Series: 100 Ω | A/TT/TTM1K-LTS: 1 KΩ
+/- 0.12% Class B | Class B Tolerance Formula: +/- °C = (0.30 °C + (0.005 * |t|))
-198 to 150ºC (-324 to 302ºF)

NOTES
Page 6
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: [phone] | Website: workaci.com
Version: 4.0
I0000822

NOTES
Page 7
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: [phone] | Website: workaci.com
Version: 4.0
I0000822

Automation Components, Inc.
2305 Pleasant View Road
Middleton, WI 53562
Phone: [phone]
Website: workaci.com
Page 8
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: [phone] | Website: workaci.com
Version: 4.0
I0000822