APPENDIX Internal Amplifiers Internal amplifiers are practical if temperatures at the transducer are in the range of 0 °C to 85 °C [0° F to 185° F]. When temperatures are beyond these levels, in-line amplifiers can be used to amplify the transducer output. Our internal transducer electronics condition and amplify the strain gage millivolt signal to a standard output range of 0 Vdc to 5 Vdc or 4 mA to 20 mA. The amplifier is constructed as an integral part of the electrical connector end of the pressure transducer or load cell. Potentiometer adjustments for the zero and span (gain), accessible through two small holes in the transducer body, are usually provided. (Potentiometers may not be available on units with conduit or cable exit.) These holes are covered with O-ring sealed screws to provide environmental protection. The range of zero and span adjustments are ±15 % min. of full scale. With the exception of the two-wire current amp, the internal amplifiers listed below include an internal shunt calibration resistor as a standard feature. Internal amplifier Description Voltage amp (option 2a) Connect ±15 Vdc power input to get non-floating output. This amplifier is used when only positive output is required. (ie: gage or absolute pressure transducers, compression-only load cells, etc.) Use wiring code 11, 12, or 13 depending on electrical termination (Reference application sheet #008-0356-00).* Bipolar voltage amp (option 2b) Connect ±15 Vdc power input to get non-floating output. This amplifier is used when both positive and negative output are required. (ie: differential pressure transducers, tension/ compression load cells, accelerometers.) Use wiring code 11, 12, or 13 depending on electrical termination (Reference application sheet #008-0356-00).* Vehicle powered voltage amp (option 2c) Connect with power pack or vehicle battery power for field use. This amplifier has a high degree of regulation to accept battery voltage changes plus transient protection. It can drive loads of up to 5 milliamperes at full output. Use wiring code 14, 15, or 16 depending on electrical termination. (Reference application sheet #008-0357-00). Voltage amp three-wire 0 V to 10 V or ±10 V (option 2t) Connect with any power supply from 15 Vdc to 28 Vdc to get output of 0 Vdc to 10 Vdc or ±10 Vdc, with respect to the (-) power supply terminal. Can drive loads up to 2.5 mA at 10 V output. (Reference application sheet #008-0360-00). Current amp three-wire (option 2j) This amplifier has inherent protection against shorting any combination of pins to ground. Applying 32 V on output will not harm amplifier. Maximum load resistance is 500 ohm. Long lead wires reduce loss in accuracy. Use wiring code 19, 20, or 21 depending on electrical termination. (Reference application sheet #008-0361-00). Current amp three-wire (option 2k) This amplifier is often ideal for unregulated power supplies in rugged industrial locations, fits two-wire 4 mA to 20 mA current loops, and is often usable and accurate over great distances. (not available on all transducer models, 5000 ohm bridge required.) Use wiring code 22 or 23 depending on electrical termination (Reference application sheet #008-0358-00). Current amp two-wire intrinsically safe (option 2n or 2N) Honeywell products configured with a 4 mA to 20 mA, two-wire output using option code 2n or 2N are marked as follows: Connection options: Products with option code 2n or 2N feature a standard welded, stainless steel electrical connector. Products with permanent integral cable and CSA or ATEX approval are limited to 30,5 m [100 ft] of cable. Honeywell document #008-0547-00, available from our Web site, contains up-to-date information regarding: Intrinsically safe installation Entity parameters CSA Certificate of Conformity ATEX Declaration of Conformity Non-Incendive installation Explosion-proof transmitters Models 811 and 911 are NOT intrinsically safe and thus do not use option code 2n or 2N. Power is the input voltage required to drive the transducer bridge including the built-in electronics. When the illustration shows a voltage input of, for example, 26 Vdc to 32 Vdc, this means that the amplified transducer will run on any input voltage between 26 V to 32 V. Slow variation in input voltage will not have any effect on the output because the internal electronics have built-in voltage regulation. The specification for output means the transducer is calibrated at the factory for the specified output at full range. For example, for a 100 psia pressure transducer, the output would be 5 volts dc when 100 psia pressure is applied to the transducer. * Not for new design, for replacement only. 512 Questions? Contact us at either 1-800-848-6564, +1 614-850-5000, or our Web site for customized options: (http://sensing.honeywell.com/TMsensor-help). Specifications subject to change. APPENDIX Internal Amplifier Specifications Voltage output: Option 2c Voltage output: Option 2t Voltage output: Option 2b Input power (voltage) 11 Vdc to 28 Vdc 15 Vdc to 28 Vdc ±15 Vdc Input power (current) 40 mA 40 mA 45 mA Output signal 0 V to 5 V or ±5 V @ 5 mA 0 V to 10 V or ±10 V @ 5 mA ±5 V @ 2.5 mA Frequency response 3000 Hz 3000 Hz 3000 Hz Power supply rejection 60 dB 60 dB 80 dB with ±15 V power; 60 dB with 26 V to 32 V power Operating temperature -20 °F to 185 °F -20 °F to 185 °F 0 °F to 185 °F Reverse voltage rejection Yes Yes Yes Short circuit protection Momentary Momentary Output to output ground Possible options Special temperature ranges Remote buffered shunt calibration Special temperature ranges Remote buffered shunt calibration Special temperature ranges Programmable range changing Remote buffered shunt calibration Current three-wire: Option 2j Current two-wire: Option 2k Intrinsically safe: Option 2n (2N) Input power (voltage) 22 Vdc to 32 Vdc (depends on load resistance) 9 Vdc to 32 Vdc typical (depends on load resistance) 9 Vdc to 28 Vdc Input power (current) 65 mA 4 mA to 28 mA 4 mA to 24 mA Output signal 4 mA to 20 mA 4 mA to 20 mA 4 mA to 20 mA Frequency response 2500 Hz 300 Hz 2000 Hz Power supply rejection 60 dB 60 dB 60 dB Operating temperature 0 °F to 185 °F 0 °F to 185 °F -20 °F to 200 °F Reverse voltage rejection Yes Yes Yes Short circuit protection Yes Yes Yes Possible options Special temperature ranges Remote buffered shunt calibration Special temperature ranges Remote buffered shunt calibration Remote buffered shunt calibration + Two-wire current amp Output 4 mA to 20 mA \ Specifications subject to change. - Questions? Contact us at either 1-800-848-6564, +1 614-850-5000, or our Web site for customized options: (http://sensing.honeywell.com/TMsensor-help). 513