Digital Status Inputs - 9 off
Individually opto-isolated inputs
Maximum Input Voltage = 30V
Minimum Input on Voltage = 10V
Maximum Input off voltage = 3.0V
Input Impedance 2-2.5K Ohm typical
Protection Surge and reverse voltage protection
Additional Features Fleeting input detection provided
Digital Status Outputs - 8 off
Individually optically isolated
Max Output Current = 100mA
Max Output Saturation Voltage = 2.1V @ 100mA>
Max Output Standoff Voltage = 32V, limited by input protection
When off/Reset/Power on State All digital outputs OFF
Two outputs can be used as pulse outputs or PWM outputs
Frequency range is DC to 500Hz
PWM Mode 0% to 100% in 0.2% steps
Meter Pulse Inputs & Period Measurement – 4 off
Inputs can use differential or single ended inputs
All meter inputs are individually opto-coupled
Input signal levels from ± 3.5V to ± 24V
Input current minimum = 5mA
Input Impedance = 1K Ohm
Frequency range from DC to 10 kHz
Inputs A & B feature back-to-back optos, allowing full quiescent line and electronic integrity testing, when used with differential pre‑amps such as the ST106
Dual Pulse compliance Inputs A & B support IP 252/76, ISO6551 or API Ch 5.5 level A or B, with line integrity, even when static
Accuracy of period measurement 2.5 ppm
Period resolution 5 Nanoseconds
Raw Pulse Bus
Configuration Digital Ground referenced Differential transceiver
Gating & Direction software controlled
Use to bus together multiple streams to a common prover
Signalling RS422 Compatible drive & receive levels
Max output frequency 10 kHz
Alarm Relay
The relay used for the Gen3 hardware is a PhotoMOS solid state change-over relay
Contact Form Both Form A (Normally Open) & Form B (Normally Closed)
Max current 1A (de-rate to 0.5A for operation above 75°C ambient)
Max Voltage 32V, limited by input protection
Isolation 100V
Control Released on de-power or watchdog restart or software command
Analogue Inputs – 6 off
Type of Inputs: 1 to 5 Volt or 4-20 mA, Differential inputs
All channels individually isolated to 50V RMS in voltage and current input mode
Conversion Method: 24 bit Sigma-Delta ADC
Effective resolution: More than 18 bits, auto zero, auto calibrate
Conversion time: Less than 100 mSec per channel
All channels can be acquired simultaneously
Series mode rejection: >100 dB at 50 Hz and 60 Hz
Voltage Common mode range: ± 50V relative to computer ground or other input
Calibration Period 3 Years to ± 0.02% of reading
RTD Inputs – 2 off
4 wire Kelvin connection using Pt 100 RTD
Temperature measuring range: -100°C to +300°C
Resolution: 0.01°C
Accuracy: ± 0.05°C, -100°C to +200°C and ± 0.1°C, +200°C to +300°C/li>
PRT cables Loop resistance up to 600 Ohms
Continuous cable integrity tests for excitation current and voltages allow open and short circuit detection
RTD current sources 1mA nominal>
3 Wire Mode Not Supported
Each RTD uses one Analog Input channel
Analogue Outputs – 2 off
Each channel is an individually isolated current controlled 0 to 21mA output that can be used to sink or source power
Resolution: 14 bits
Accuracy: ± 0.1% at 23°C
Temperature Coefficient: 10ppm / °C
Minimum Load Loop resistance: Safe down to zero Ohms from +32V external supply
Maximum Load Loop resistance: 1000 Ohms when powered from +24V external
Maximum External Supply: 32 Volts
Output Form: Isolated active current controller
Number of field connections: 2 terminals per channel
Update time: 500mSec to within 1%
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Type of Input Differential voltage inputs
Input Range 0 to +5.15V or 0 to 21.5mA
+5°C to +45°C
± 0.020% of reading from 1.0 to 5.15V and
± 0.025% of reading from 4.0 to 21.5mA
-25°C to +55°C
± 0.025% of reading from 1.0 to 5.15V and
± 0.030% of reading from 4.0 to 21.5mA
-40°C to +85°C
± 0.050% of reading from 1.0 to 5.15V and
± 0.065% of reading from 4.0 to 21.5mA