Emerson Process Management 3400, 3410, 3420, 3422 GaindB = 20 ⋅ log(GainHardware), and, and, GainA1, GainD2, screen, Section, StackSize, StackSize, StackSize, StackSize, GainLowLmt, GainLowLmt, GainHighLmt

	Reference, Installation, and Operations Manual	Upgrading a Mark II to a Mark III
3-9000-743 Rev S		June 2013

C.4.3 Gain

The Mark III signal gain values (GainA1...GainD2) and limits (GainLowLmt and GainHighLmt) are read in hardware gain units. Daniel MeterLink converts the hardware gain units to decibels (dB) for display purposes using the conversion equation:

Equation C-10 Mark III Gain Conversion Equation

GaindB = 20 ⋅ log(GainHardware)

The Mark III gain units differ from those used by the Mark II. Therefore, the Daniel MeterLink configuration conversion does not convert the Mark II GainLowLmt and GainHighLmt parameters. The Mark III GainLowLmt and GainHighLmt data points should be at their default values (the widest allowable gain limits) and are unmodified by the Daniel MeterLink configuration conversion. These data points can be modified using the Daniel MeterLink Edit/Compare Configuration screen.

C.4.4 Batch update period and stack size

The Mark III batch update occurs at a fixed timed interval whereas the Mark II batch update occurs after each BatchSize firing sequences are completed.

For the Mark III, the batch update period is a function of the SpecBatchUpdtPeriod and StackSize data points (as described in Section 6.1.3).

When using Daniel MeterLink to convert a Mark II configuration for use in a Mark III, the Mark II BatchSize parameter is not converted. The Mark III SpecBatchUpdtPeriod should be at its default value (standard update period of 1 sec) and is unmodified.

The Mark III does not support “stacking-by-chord.” The Mark II StackSize parameter is converted to the Mark III StackSize data point as follows:

StackSize	StackSize
(Mark II)	(Mark III)
0, 1, 128 or 129	1 (none)
2 or 130	2
4 or 132	4
8 or 136	8
16, 32, 144, or 160	16

Gain 307