Cameron Barton 752, Руководство пользователя

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Section 1 Model 752 and 752A Differential Pressure Transmitters
Specifications (cont'd)
Load Range
(includes line and receiver; see Figure 3.3, page 16 )
4-20 mA ....................................... 50 ohms per volt above 12 VDC (to 2900 ohms
maximum)
10-50 mA ..................................... 20 ohms per volt above 12 VDC (to 1160 ohms
maximum)
Load Effect*
4-20 mA ....................................... ±0.025% of factory-calibrated span per 100-ohms
change
10-50 mA ..................................... ±0.05% of factory-calibrated span per 100-ohms
change
Power Supply Effect*
4-20 mA ....................................... ±0.025% of factory-calibrated span per 1 Volt
change
10-50 mA ..................................... ±0.05% of factory-calibrated span per 1 Volt change
Noise* ............................................. 0.2% (peak-to-peak) maximum of factory-calibrated
span
Thermal Effect*(combined effect
on zero and span)........................... ±1.0% of factory-calibrated span per 100 º F change
within the operating temperature range selected
Operating Temperature ................... 40 º F to 135 º F (standard), -15 º F to +135 º F (optional)
Max. Safe Working Pressure .......... 3000 psig
Static Pressure Effects*
1-30 psid range............................ ±0.2% of factory-calibrated span per 1000 psig
30-200 psid range........................ ±0.5% of factory-calibrated span per 1000 psig
200-500 psid range...................... ±1.0% of factory-calibrated span per 1000 psig
Overpressure Effects*
1-30 psid range............................ ±0.5% of factory-calibrated span per 1000 psig
30-200 psid range........................ ±1.5% of factory-calibrated span per 1000 psig
200-500 psig range...................... ±3.0% of factory-calibrated span per 1000 psig
Overpressure limit .......................... Up to 3000 psig on either side of DPU without
damage to unit
Process Connections...................... 1/4" and 1/2" NPT (female) on both high and low
pressure sides
Weight ............................................ 8 lb (basic)
Electrical Interface .......................... 1/2 inch conduit connections to internal screw termi-
nals (external junction box optional)
*Note: Turndown has a directly proportional effect on the indicated specifications. Zero
or span field adjustments beyond ±5% may affect indicated performance. Calibration is
by the end-point method with zero and full scale outputs held to ±0.5% of true calibrated
values.
IMPORTANT: The Model 752 and 752A transmitters have no integral electronic interfer-
ence suppression features. If an instrument is to be installed in an area
containing EMI/RFI sources and this interference cannot be tolerated,
take precautions to protect the transmitter signal. See also EMI/RFI
Shielding, page 17 . An optional EMI/RFI filter system is available upon
request.