Instruction and Operation Manual
X-CM-QmBS-eng
Part Number: 541B052AHG
June, 2008
Appendix A Dimensions and Specifications
QmBS Sensor / QTA Transmitters
Table A-11 FM transmitter Input/output Signals (Continued)
All transmitters
One 4-wire sensor signal input connection with ground
One or two active or passive discrete outputs
• Not intrinsically safe
• Can report event 1, event 2, event 1 and event 2, flow switch, forward/reverse
flow, calibration in progress, or fault
• Power:
- Internal (active): +15 VDC ±3% with a 2.2 kohm internal pull-up resistor
- External (passive): +30 VDC maximum, +24 VDC typical
• Maximum sink capability: 500 mA
One discrete input
• Can be configured for internal or external power
• Not intrinsically safe
• Power:
- Internal (active): +15 VDC, 7 mA maximum source current
- External (passive): +3 to 30 VDC maximum
• Can report reset all totals, reset mass total, reset volume total, or start sensor
zero
Output option code 6
(F
OUNDATION
fieldbus)
One F
OUNDATION
fieldbus H1 output
Manchester-encoded digital signal conforms to IEC 1158-2
Output option code 7
(Profibus-PA)
One Profibus-PA output
Manchester-encoded digital signal conforms to IEC 1158-2
A-8
Table A-12 FM Transmitter Digital Communications
All transmitters
One service port can be used for temporary connection only
Uses RS-485 Modbus signal, 38.4 kilobaud, one stop bit, no parity
Output option code 1, 3, or 4
HART Bell 202 signal is superimposed on the primary milliamp output, and is
available for host system interface:
• Frequency: 1.2 and 2.2 kHz
• Amplitude: to 0.8 V peak-to-peak
• 1200 baud
• Requires 250 to 600 ohms resistance
Output option code 1 or 3
One RS-485 output can be used for direct connection to a HART or Modbus host
system.
Modbus communications supports 7-bit or 8-bit protocol (default: 8-bit), 1200 to
38,400 baud (default: 9600), one or two stop bits (default: one), and odd, even, or
no parity (default: odd). Configuration can be changed using ProLink II software or
the display (if applicable).
Output option code 6
(F
OUNDATION
fieldbus)
Transmitters are registered with the Fieldbus Foundation, and conform to the
F
OUNDATION
fieldbus H1 protocol specification.
Input frequency from sensor:
• Mass flow: 20 Hz
• Volume flow: 20 Hz
• Density: 20 Hz
• Temperature: 1Hz
Analog input function blocks:
• Cycle time: Host dependent
• Update rate: 50 milliseconds
• Refresh rate: Host dependent
