Monday, 06 June 2011 03:48 Last Updated on Monday, 29 August 2011 00:32 Written by Administrator

DC TRANSMITTER WITH INPUT LOOP EXCITATION
PLUG-IN MODULE, FIXED RANGE

JH4305: DC Input Isolated Transmitter with 24V Input Loop Supply
    • 4/20mA Input Typical, Others Available
    • Provides 24V Power to Input Loop
    • Quick-Check Red/Green Output LEDs
    • Uses Standard 8-Pin Socket
    • AC or DC Power Options

    JH4305
    PDF
    DATA SHEET

    JH4305
    PDF
    MANUAL

Model JH4305 provides 24Vdc loop excitation for a remote 2-wire transmitter, takes the signal from that transmitter and provides a proportional DC voltage or current output. It also may be used with DC-powered "3-wire" sensors and transmitters whose supply currents do not exceed 25mA. Input/output isolation overcomes the ground loop problems sometimes encountered with nonisolated DC-powered transmitters.

Using the JH4305 often eliminates the need for separate loop or system power supplies. Applications include boosting the drive capabilities of two-wire transmitters, converting current signals to voltages and splitting currents to provide two independent loops.

Red-green Quick-Check LEDs give a quick indication of the relative output. Red is brighter at the low end, green at high, while at mid-scale both are approximately equal. Red-only indicates offscale low while green-only indicates offscale high.

The JH4305 is a fixed-range device, precisely calibrated at the factory. AC and DC power choices are available.

ORDERING INFORMATION

Model Number: 

Select JH4305-AC for AC power, JH4305-DC for DC power.
Input Range: 

Select 4/20mA for use with 2-wire inputs, or any other range allowed by the "Input Capabilities" spec, below.
Output Range: 

Specify any DC voltage or current range allowed by the "Output Capabilities" spec, below.
Power: 

Specify 115Vac, 230Vac, 12Vdc or 24Vdc.
Reverse-Acting Transmitter
(decreasing output with increasing input): 

Specify Option RT.
Loop-Powered Output: 

4/20mA "current sink" output stage for connection to devices whose inputs provide 24Vdc loop excitation. Specify Option LPO.
Urethane Coating:  

Specify Option "U"

INSTALLATION AND CONNECTIONS

The JH4305 plugs into any standard 8-pin circular ("octal") relay socket. JH Technology offers a socket suitable for DIN-rail or surface mounting (see the Accessories page). Pin connections are:

Pin 1: 

Power (AC or, if DC power option, DC plus).
Pin 2: 

No connection.
Pin 3: 

Power (AC or, if DC power option, DC minus).
Pin 4: 

+24Vdc power to input transmitter.
For 2-wire loop, connect to transmitter’s plus output terminal.
For 3-wire transmitter, connect to transmitter’s plus power terminal.
Pin 5: 

Input plus.
For 2-wire loop, connect to transmitter’s minus output terminal.
For 3-wire transmitter, connect to transmitter’s plus output terminal.
Pin 6: 

Input common.
Not used with 2-wire loop.
For 3-wire transmitter, connect to transmitter’s minus (common) terminal.
Pin 7: 

Output plus.
Pin 8: 

Output minus.

DETAILED SPECIFICATIONS

Voltage Input Capabilities: 

50mV minimum span, +/-20V maximum input. Offset ranges are allowed.
(Input Impedance: 200kohms or greater.)
Current Input Capabilities: 

1mA minimum span, +/-25mA maximum input. Specify 4/20mA when used with a 2-wire transmitter. Offset ranges are allowed.
(Input Resistance: Varies with input range. Contact factory for details. 62 ohms for 4/20mA input.)
Input Excitation: 

24Vdc regulated, 25mA max. current.
Voltage Output Capabilities: 

1 volt minimum output span, -10 to +15V absolute limit. Offset ranges are allowed. Maximum output load, 10mA (1Kohm at 10V output).
Current Output Capabilities: 

1mA minimum output span, 0 to +25mA absolute limit. Positive offsets are allowed, negative outputs are not. Output drive capability, 24V (1,200 ohms max. at 20mA output).
Accuracy (factory calibration): 

+/-0.1% of span or better.
Adjustability: 

Zero and span each are adjustable approx. +/-15% of span.
Linearity: 

+/-0.05% of span or better.
Response Time: 

Under 100 milliseconds.
Isolation: 

Power, 1,500Vac rms (2,100V peak). Input/Output, 1,000Vac rms (1,400V peak).
Guaranteed Operating Temperature: 

-10 to +60 deg. C (14 to 140 deg. F).
Temperature Stability: 

+/-0.02% of span per deg. C, or better.
Power Requirements: 

AC, 115 or 230Vrms, 50/60Hz, 2.5V-A. DC, 12 or 24V, 2.5W.