Pyromation SERIES 401 User Manual download pdf

INSTALLATION AND OPERATING INSTRUCTIONS

SERIES 401 RTD TEMPERATURE TRANSMITTER

5211 Industrial Road • Fort Wayne, IN 46825 USA • (260) 484-2580 FAX: (260) 482-6805 • http://www.pyromation.com 3/02

General Information

The Pyromation Series 401 RTD temperature transmitter is a “two wire” loop powered resistance to current

transducer. This transmitter will produce a linearized (4 to 20) mA dc output current proportional to the

temperature of the RTD temperature sensor.

The transmitter’s small size allows universal mounting

inside Series 300, 400, and 900 screw cover heads,

Series 800 explosion-proof, thermostat housings, and

panel surface mounting using two 6-32 screws

. The

transmitter is designed for an operating ambient

temperature of (-30 to 65)

°C [(-22 to 149) °F].

Power Supply

The transmitter is designed for a nominal 24 V dc power supply. The transmitter will operate over a range of (9 to

36) V dc depending on the resistive load. Use the following formulas to determine the maximum resistive loading

(RL) allowed for the power used, or to determine minimum supply voltage (V) required for fixed resistive loads.

The formulas assume a maximum current of 20 mA.

VMIN = 20 mA × RLOAD + 9 V dc RMAXLOAD = (VSUPPLY – 9 V dc ) / 20 mA

One power supply can be used for several transmitter loops. Each loop must have only one transmitter in it and all

loops must be wired in parallel. Do not forget to observe the maximum current rating for your power supply.

Note: If used in a manner not specified by the manufacture, the protection provided by the equipment may be impaired.

Wiring

The terminal block on the transmitter can accept wire from 14 to 24 gauge. Shielded or conduit encased (twisted

pair) cable is required from the transmitter to the controller, including the sensing element and lead wire. Note that

low voltage lines should be run in separate conduit isolated from high voltage or high current carrying lines.

Open Sensor Indication

When an RTD has failed due to an open sensor, the transmitter will

indicate an error. The way the error is produced is by either driving the

current low, under 4 mA (downscale burnout) or by driving the current

high, above 20 mA (upscale burnout). Upscale burnout is standard for

all Pyromation transmitters.

However, the burnout indication does not apply to a break in the lead

compensation loop. In this case, the burnout signal will drive the

transmitter either high or low depending upon which lead has broken.

RTD ELEMENT

POWER

SUPPLY

CONTROLLER

COPPER LEADS

Note 1

1 2

°C [(-22 to 149) °F] 1

Summary of Contents

Page 1 - °C [(-22 to 149) °F]

INSTALLATION AND OPERATING INSTRUCTIONS SERIES 401 RTD TEMPERATURE TRANSMITTER 5211 Industrial Road • Fort Wayne, IN 46825 USA • (260

Page 2

INSTALLATION AND OPERATING INSTRUCTIONS SERIES 401 RTD TEMPERATURE TRANSMITTER 5211 Industrial Road • Fort Wayne, IN 46825 USA • (260

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Pyromation SERIES 401 User Manual

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