Non-indicating Two-wire Resistivity Transmitters

OBSOLETE -RSTX-200, CDC-201 and RSEX-202

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Epoxy Encapsulated
Two-Wire System Simplifies Wiring
Small Size for Convenient Mounting
Temperature Compensation to 35°C (95°F)

Description

The OMEGA ® RSTX-201-202 non-indicating two-wire transmitter for use with a matching conductivity sensor requires only two wires for output and power transmission. Current to operate the transmitter is provided by a two-wire receiver, or by an appropriate dc power supply. This controlled current loop has high noise immunity, permitting use of a simple twisted pair of wires. Since current is used instead of voltage, the resistance of the wire does not affect accuracy. The transmitter electronics are fully encapsulated. Terminal strips are provided for field connections. The transmitter can be surface-mounted in any position. The unit is supplied with a resistivity sensor. An optional polycarbonate NEMA-4X enclosure is available for environmental protection. The resistivity sensor is made of titanium and PFA. To ensure the best possible measurement accuracy, the transmitter and sensor have been factory calibrated.

SPECIFICATIONS
OPERATIONAL
Ambient Conditions:-30 to 70°(-22 to 158°F), 0-100% RH
Sensor-to-Transmitter Distance: 30 m (100 ft) max
Transmission Distance: Limited only by wire resistance and power
Power Requirements: 16 to 40 Vdc, connections via terminals
Measuring Range: 0-20 megohm/cm
Temperature Compensation: Automatic, 0-35°C (32-95°F), or at 2% per °C
Dimensions: 122 W x 119 H x 56 mm D (4.8 x 4.7 x 2.2")
PERFORMANCE (electrical, 4-20 ma output)
Sensitivity: Less than 0.01% of Stability:0.06% of span per 24 non-cumulative
Repeatability: 0.06% of span
Temperature Drift: Zero, 0.013% of span/°C; Span, 0.013% of span/°C
Non-Linearity: 0.125% of span
Response Time: 10 sec (to 90% of value upon step change)
Insertion Loss at 20 mA: 14.6 Vdc (730 ohms). Insertion loss represents a maximum resistance (listed above) in the 4-20 mA loop
Sensor Dimensions: 12.7 mm ( 1 /2 ") dia; 178 mm (7") overall length, 104 mm (4.1") max insertion length; 3.04 m (10 ft) cable
MECHANICAL
Enclosure (optional): NEMA-4X, polycarbonate, surface mount
Net Weight (less enclosure): 270 g (9.5 oz)

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Part Number/Desc.

Qty

Description

RSTX-201-202

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Availability:

Resistivity transmitter with sensor

RSTX-201-202-CDC-201

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Availability:

Resistivity transmitter/sensor and NEMA-4X enclosure

RSEX-202