Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com Specifications subject to change without notice. Installation & Operations String-Loaded Strap and Clamp-On Strap Temperature Sensors in a BAPI-Box Crossover Enclosure 37714_ins_strapclamp_passive_bbxrev. 06/24/21 1 of 4 Strap Sensors are made for direct pipe mounting and temperature measurement of water pipe applications. The Clamp-On units are for mounting before any insulation is on the pipe and the Spring-Loaded units are for mounting to pipes with up to 2” of insulation using a unique spring sensor extension. Strap units are available in multiple thermistor or RTD types as shown in the specifications. The BAPI-Box Crossover enclosure has a hinged cover for easy termination and comes with an IP10 rating (or IP44 rating with a pierceable knockout plug installed in the open port). This instruction sheet is specific to the units with the BAPI-Box Crossover Enclosure. For other enclosures, please refer to instruction sheet “20911_ins_Strap_On_Passive.pdf” which is available on the BAPI website or by contacting BAPI. Overview and Identification Fig. 1: Spring-Loaded (right) and Clamp-On Strap Sensors in a BAPI-Box Crossover Enclosure Mounting of Clamp-On Strap Units This sensor technique is for reading the fluid temperature in a pipe by reading the temperature of the pipe. Properly installed strap sensors with insulation around the local strap-on sight will offer a very accurate temperature of the water inside the pipe to within .5 °F or better of the inside pipe water temperature. 1.Fig 2 shows a typical installation for pipes from 2” to 4.5”. Stripping away insulation is OK. 2.Larger pipes can be accommodated by adding another, customer supplied, stainless steel hose clamp extending the possible pipe diameter. 3.If there is insulation, clean away a section of the pipe insulation a minimum of 2” all around the pipe. The copper sensor pad and SS strap must be in direct contact with the metal or plastic pipe. Nothing should be between the copper plate sensor and the bare pipe. 4.Tighten the strap-so that the sensor does not rotate around the pipe and so that the foam is compressed not more than 50% allowing the copper sensor plate to form (bend) to the pipe curvature for maximum temperature conduction. BAPI recommends pre-forming the copper plate by bending it around the pipe with your fingers. 5.After the sensor is securely mounted, add insulation a minimum of 1” thick and a minimum of 4 pipe diameters on each side of the copper sensor pad. (Example: A 2” pipe should have 8” of insulation on each side of the sensor). Only cover the sensor box to the top of the door hinge. Fig 2: Clamp-On Strap with BAPI-Box Crossover Enclosure installation 2 Inch Insulation Cleaned off To The Pipe Pipe Insulation Bare PipeBuilding Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com Specifications subject to change without notice. Installation & Operations String-Loaded Strap and Clamp-On Strap Temperature Sensors in a BAPI-Box Crossover Enclosure 37714_ins_strapclamp_passive_bbxrev. 06/24/21 2 of 4 This sensor technique is for reading the fluid temperature in a pipe by reading the temperature of the pipe. Properly installed strap sensors with insulation around the local strap-on sight will offer a very accurate temperature of the water inside the pipe to within .5 °F or better of the inside pipe water temperature. 1.Fig 3 shows a typical installation for insulated pipes from 5” to 14” and insulation thickness from 0.5” to 2.5”. 2.Larger pipes can be accommodated by adding another customer-supplied cable tie, extending the possible pipe diameter. 3.Make a 1.5 inch diameter hole in the insulation where the sensor is to be placed and clean the pipe from debris. Extend the spring so the copper sensor pad is in direct contact with the metal or plastic pipe. No debris should be between the copper plate sensor and the bare pipe. The spring can retract to a minimum insulation thickness of ~.5” compressed to ~2.5” extended. 4.Position the box and sensor over the hole. 5.Tighten the cable ties so that the sensor spring is compressed no more than 50% allowing the copper sensor plate to form (bend) to the pipe curvature for maximum temperature conduction. BAPI recommends pre-forming the copper plate by bending it around the pipe with your fingers. Extend the spring further by turning it clockwise if the copper sensor plate contact is questionable. The copper sensor plate must be in direct contact with the pipe. 6.After the strap on sensor is securely mounted, add insulation back in (backfill) around the spring extension, using the removed insulation, so that no heat or cold from the pipe can escape. 7.If more insulation is desired, only cover the sensor box to the top of the door hinge. Fig 3: Spring-Loaded Strap with BAPI-Box Crossover Enclosure installation 1.5 Inch Hole In The Insulation Pipe Insulation Mounting of Spring-Loaded Strap Units Wiring & Termination BAPI recommends using twisted pair of at least 22AWG and sealant filled connectors for all wire connections. Larger gauge wire may be required for long runs. All wiring must comply with the National Electric Code (NEC) and local codes. Do NOT run this device’s wiring in the same conduit as high or low voltage AC power wiring. BAPI’s tests show that inaccurate signal levels are possible when AC power wiring is present in the same conduit as the sensor wires. Fig. 4: 2-Wire Termination for Thermistor or RTDsFig. 5: 3-Wire Termination for RTDs Thermistor or RTD Sensor To Controller Analog Input (AI) (No Polarity) To Controller Analog Input (AI) (No Polarity) THERMISTOR AND RTD TERMINATIONBuilding Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com Specifications subject to change without notice. Installation & Operations String-Loaded Strap and Clamp-On Strap Temperature Sensors in a BAPI-Box Crossover Enclosure 37714_ins_strapclamp_passive_bbxrev. 06/24/21 3 of 4 Fig. 6: Terminal Strip (-TS) or Test and Balance (TB) Option for 2 Wire Sensors Fig. 7: Terminal Strip (-TS) or Test and Balance (TB) Option for 3 Wire Sensors Factory Wired Sensor To Controller Analog Input (AI) (No Polarity) Factory Wired Sensor To Customer-Supplied 3-Wire Transmitter Sensor Type Low Temp (40° F) Resistance Value High Temp (105°F) Resistance Value 1000Ω RTD1.02KΩ (41.20°F)1.15KΩ (101.5°F) 3000Ω Thermistor7.87KΩ (39.8°F)1.5KΩ (106.8°F) 10K-2 Thermistor30.1KΩ (34.9°F)4.75Ω (109.1°F) 10K-3 Thermistor26.7KΩ (35.9°F)5.11KΩ (108.4°F) 10K-3(11K) Thermistor7.32KΩ (43.7°F)3.65Ω (105.2°F) TEST AND BALANCE SWITCH: For units with a Test and Balance Switch, the Norm position allows the real sensor at be monitored at “Sensor A Out”. The High position forces the “Sensor A Out” to a very hot reading and the Low position forces “Sensor A Out” to a very cold reading (see Table below). Wiring & Termination continued... UNITS WITH A TERMINAL STRIP AND TEST AND BALANCE SWITCH Possible Solutions: -Confirm the input is set up correctly in the front end software - Check wiring for proper termination & continuity. (shorted or open) - If the unit has a Test and Balance switch, make sure that the switch is in the center “Norm” position. - Measure the physical temperature at the temperature sensor’s location using an accurate temperature standard. Disconnect the temperature sensor wires and measure the temperature sensor’s resistance across the sensor output pins with an ohmmeter. Compare the temperature sensor’s resistance to the appropriate temperature sensor table on the BAPI website. If the measured resistance is different from the temperature table by more than 5% call BAPI technical support. Find BAPI’s website at www. bapihvac.com; click on “Resource Library” and “Sensor Specs” then click on the type of sensor you have. Possible Problems: Controller reports higher or lower than actual temperature DiagnosticsBuilding Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com Specifications subject to change without notice. Installation & Operations String-Loaded Strap and Clamp-On Strap Temperature Sensors in a BAPI-Box Crossover Enclosure 37714_ins_strapclamp_passive_bbxrev. 06/24/21 4 of 4 4 of 4 Specifications SENSOR SPECS Sensor: Passive Thermistor...............NTC, 2 wire RTD.........................PTC, 2 or 3 wire Thermistor: Thermal resistor Temp. Output...........Resistance Accuracy (Std) ........±0.36ºF, (±0.2ºC) Accuracy (High) ......±0.18ºF, (±0.1ºC), [XP] option Stability ...................< 0.036ºF/Year, (<0.02ºC/Year) Heat Dissipation .....2.7 mW/ºC Temp. Drift...............<0.02ºC per year Probe Range ..........-40º to 221ºF (-40º to 105ºC) RTD: Resistance Temperature Device Platinum (Pt) ..........100Ωor 1KΩ @0ºC, 385 curve, Platinum (Pt) ..........1KΩ @0ºC, 375 curve Pt Accuracy (Std) ...0.12% @Ref, or ±0.55ºF, (±0.3ºC) Pt Accuracy (High) .0.06% @Ref, or ±0.277ºF (±0.15ºC), [A]option Pt Stability ..............±0.25ºF, (±0.14ºC) Pt Self Heating .......0.4 ºC/mW @0ºC Pt Probe Range ......-40º to 221ºF, (-40 to 105ºC) Nickel (Ni) ...............1000Ω @70ºF, JCI curve Ni Probe range .......-40º to 221ºF (-40 to 105ºC) Sensitivity: Approximate @ 32ºF (0ºC) Thermistor ..............Non-linier See bapihvac.com “Sensor Specs” 1KΩ RTD (Pt) .........3.85Ω/ºC 100Ω RTD ..............0.385Ω/ºC Nickel (Ni) ..............2.95Ω/ºF for the JCI RTD ENCLOSURE AND WIRING SPECS BAPI-Box Crossover Enclosure Ratings: IP10, NEMA 1 IP44 with knockout plug installed in the open port BAPI-Box Crossover Enclosure Material: UV-resistant polycarbonate & Nylon, UL94V-0 Environmental Operating Range: -40 to 185ºF (-40 to 85ºC) 0 to 100% RH, Non-condensing Lead Wire: 22AWG stranded Wire Insulation: Etched Teflon, Plenum rated Probe: Copper sensor plate, 24 AWG, 1.25” diameter Mounting Clamp-On Unit:1/2” SS worm gear hose clamp Spring-Loaded Unit: 48” Nylon cable tie, 1/2” wide Agency: RoHS PT= DIN43760, IEC Pub 751-1983, JIS C1604-1989Next >