Internal Amplifiers - Honeywell Test and Measurement Sensors

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.
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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).
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