3595 1Q1-20 Channel Analogue Reed Relay IMP Replacement of 3595 1H IMP
The 35951Q1 is an enhanced version of the 35951C1, which includes 3 and 4 terminal resistance and RTD measurement facilities organised in a similar way to the original 35951H IMP. All 20 channels are available to use in pairs for the 3 and 4 wire measurement modes.
The channels are fully programmable and so each 3 or 4 wire measurement takes up 2 channels but leaves the rest available for other 35951C measurement modes. It remains compatible with the 35951C, and the resistance measurement modes are programmed using the same codes as a 35951H. The connector wiring for the 3 and 4 terminal resistance modes differs a little from the 35951H , but otherwise the 35951Q is compatible with the measurement modes of the 35951H analogue channels.
Compatible Communications with 3595 series
Compatible enclosure and connector blocks
Thermocouple, resistance, RTD, voltage and current measurements in rugged enclosure.
20 Channels per Module – precision reed relay isolation. Individually programmable
Precision 3 and 4 wire resistance and RTD measurements. (35951Q1)
Enhanced 14 to 19/20 bit resolution. 100 to 10 measurements per second
Enclosed connector blocks. Dual sensor accurate Cold Junction Compensation
Thermocouple health monitoring Temperatures in ‘C or ‘F unit
Number of channels / module: 20/10
Number of poles / channel: 3/6
Connector type input channels: Standard 3595 series, Isothermal Enclosure, Screw Terminals.
Measurement modes: V DC, (mV DC, uVDC), Thermocouple, CJC temperature, Sensor health
Thermocouple types: K,J,T,R,S,E,B,N
Thermocouple compensation: Dual sensors
35951Q1 only: 3&4 wire resistance, 3&4 wire PT100
Measurement resolutions supported:
- 19/20 bits at 9 measurements/s
- 18/19 bits at 20 measurements/s
- 17 bits at 30 measurements/s
- 17 bits at 40 measurements/s
- 15 bits at 80 measurements/s
- 14 bits at 100 measurements/s
Number of bits includes sign counted as 1 bit.
50 Hz Mains frequency interference rejection is provided by 17 and 20bit mode.
60 Hz mains interference rejection is provided by 17,19 and 20 bit modes.
Higher Measurement rates possible by disabling drift correct measurements.
Voltage measuring mode
Input voltage ranges: +12V >-12V
Automatic range selection is supported.
DC measurement accuracy +/- 0.015% of reading + 0.01% of range + 4uV
Temperature coefficients DC voltage: 25ppm rdg + 0.1uV/ o C
Measurement sensitivity 30mV range 18 bits: <0.25uV
Additional error at 80 & 100/sec mode 0.03% of range
Thermocouple Measurement Accuracy
Internal Cold junction compensation errors included: (External compensation is also available)
Type Range Accuracy
K -100 to 500 0.5oC
500 to1200 0.7
1200 to 1600 3.0
J -50 to 360 0.5
360 to 800 0.7
T -150 to 400 0.5
R 0 to 1600 2.0
S 0 to 1700 2.2
E -50 to 290 0.7
290 to 1000 1.0
B 200 to 1600 4.5
N -200 to 1600 1.3
-100 to 580 1.1 5
80 to 1300 1.3
Displayed sensitivity: <0.1oC
Thermocouple Health Monitoring automatic by resistance measurement sequence.
Sensitivity ( 100R shunt fitted): <10nA
Accuracy as for voltage ranges + shunt accuracy
Measurement configurations: 3 and 4 wire connection
Measurement Ranges: 2000 ohm, 256 ohm, 32 ohm
Sensing Current: <0.75 mA (switched)
Accuracy: 0.03% rdg + 0.015% rng +3 mohm at 18-20bits
Sensitivity @17bits: <1 mohm
PT100 -50 to 400 oC: +/-0.2oC
-150 to 600 oC: +/-0.4oC
Measurement modes: 3 wire and 4 wire
Common mode rejection ratio channel group: <0.1uV/V
Single channel common mode rejection ratio: <1uV/V
Series mode rejection ratio 50 or 60 Hz +/- 0.05%: <1mV/V
Applies to 18,19,20 bit measurements.
DC channel common mode rejection ratio: <0.1uV/V
Maximum voltages operating:
Max. voltage between (+) and (-) inputs, same channel: +-12V
Maximum voltage between any two terminals: 200V
Note: reed scanners are not suitable for direct connection to power circuits
Channel overload protection: Passive
For protection against transients and ground loops.
Isolation test voltage IMP to IMP or to SNET Tested at 500V
Connector: Via SNET cable
Voltage: 11 to 48V
Current: <100mA at 12V, <50mA at 24V
SNET Interface: SNET standard compatible
STATUS LED’s: 4
Function: Power, Communication, ADC fault, Calibration error
Safety: EN61010-1:2010, EN61010-2-30:2010,
EMC: EN55011:2009, EN 61326-2-1:2006
Case size: 435*215*34.5mm
Protrusion of cable boots: 45mm
Operating Temperature Range: -20 to 70oC
Relative Humidity(non condensing): 85% at 40oC
Vibration: 1g 10hz to 400Hz in 3 planes
Programming storage: Secure flash memory
Calibration temperature is 21’C