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ELECTRO-CHEMICAL DEVICES, INC. 23665 Via Del Rio Yorba Linda, CA 92887 SPECIFICATION SUMMARY T28 CONDUCTIVITY TRANSMITTER Revised 2/2000 MEASUREMENT RANGE: 3 ranges: 1) Low range (Model CDL): 1µS to 20 µS full scale. 2) High range (Model CDH): 50µS to 20 mS full scale. 3) Toroidal (model CDT): 50 mS to 1.5 S full scale. Conductivity or concentration The transmitter can read in conductivity engineering units and or the concentration (linear in % by weight) of a specific electrolyte. I.e. Sodium Hydroxide OUTPUT 4-20 mA or 20-4 mA, linear, field expandable and reversible. POWER REQUIREMENTS (with zero loop impedance) Recommended 24 VDC Maximum 50 VDC Minimum 14 VDC MAXIMUM LOOP IMPEDANCE 500 Ω for 4-20 mA @ 24 VDC 1,800 Ω for 4-20 mA @ 50 VDC Optional POWER SUPPLY 115 VAC, 50/60 Hz, 0.5 amp. UL Approved, Unfused and encapsulated, mounts inside wiring chamber of T28 * OPERATING TEMPERATURE -4oF to +158o F (-20oC to +70o C) DISPLAY Menu driven, 24 character alphanumeric, Supertwist, High Temp LCD. Internally rotates +/- 180o for best viewing angle. The main menu simultaneously displays: 1) Process identity 2) Process value (in engineering units) 3) Current output (0 to 100%) 4) Temp. in O C or O F. Must be specified at time of order. ENCLOSURE FM Approved EXPLOSION PROOF for use in Class I, Division 1, Groups C through G. with proper sealing fittings. 300 series Stainless Steel NEMA 7C Electronics; FM approved Intrinsically safe for use in Class I, II, and III Divisions 1, Groups A through G. (Diameter X Length) (8.7 cm X 12.5 cm). ACCURACY +/- 0.10% of full scale LINEARITY +/- 0.05% of full scale SENSITIVITY +/- 0.01% engineering units, or +/- 0.1% of full scale STABILITY +/- 0.2% per year @ 0o C to 70o C
RESPONSE TIME 90% of input step change ≤ 1 second. 50/60 Hz NOISE REJECTION Greater than 70 db TEMPERATURE COMPENSATION Automatic, +30o C to +140o C, RTD. Adjustable slope from 0% to +10% to compensate for different solutions or ranges. Temperature is displayed in degrees C. Accuracy within +/- 1% over a 0oC-100o C span. INPUT/OUTPUT ISOLATION Maximum 300 volts between process input & 4-20mA output. OPERATIONAL CHARACTERISTICS Menu-driven, keystroke calibration and configuration via (4) magnetic, non-intrusive switches through the front viewing window. MEMORY Non-Volatile, EEPROM. CALIBRATION Zero and a user defined standard solution value used for the span calibration. MANUAL OUTPUT OVERRIDE Decouples Sensor Input and Current Output, allowing (bumpless) stabilization of output while calibrating, and/or manually adjusting output. Auto Calibration Allows the definition of one Cal point, saved in memory, during the initial start-up. This will allow subsequent span calibrations with only 2 magnetic keystrokes. Diagnostic Displays Signal and Reference displays furnish diagnostics of the sensor hardware. Temperature Trim Allows for compensation for any differences in RTDs by programming the offset into the transmitter. Temperature Display Temperature is displayed in o C (standard) Temperature displayed in oF (Optional) consult factory Display Contrast Fully adjustable for ambient lighting conditions. MOUNTING HARDWARE Universal Mounting Bracket Assembly for 2 inch pipe or wall mounting, Stainless Steel. WEIGHT Standard T28: Shipping Weight:
6.5 lbs (2.95 kg) 7.5 lbs (3.4 kg)
* 55 oC for FMRC I.S. Rating
800-729-1333
Fax (714) 692-1333
