Emerson 00809-0100-4514, 1154 manual Linearity Adjustment, Rosemount, Reference Manual

Rosemount 1154

Reference Manual

00809-0100-4514, Rev BA January 2008

Material

•Wire: 22-gauge tinned solid copper – Fed Spec QQW343, ASTM B33

•Solder: 60% tin, 40% lead (60/40) – Fed Spec QQ-S-571

•Flux: MIL F 14256, Type A, Fed Spec QQ-S-571 Type RA

Method

Figure 3-3. Jumper Wire Placement.

a.Locate the three turret terminals on the component side of the amplifier board. Remove any jumper wires between them (see Figure 3-3).

b.To elevate zero, connect a jumper wire between the middle terminal and the terminal marked “EZ” (see Figure 3-3,Detail B).

c.Wrap the jumper wire once around each terminal and cut off any excess.

d.Solder the jumper wire to the terminals using proper electronics soldering techniques. Clean solder joints thoroughly with isopropyl alcohol.

e.Plug the amplifier board back in and complete the zero adjustment.

To suppress zero, follow the same procedure, except connect the jumper wire between the middle terminal and the terminal marked “SZ” (see Figure 3-3,Detail C).

6.Recheck full scale and zero and fine tune if necessary.

NOTE

There is some mechanical backlash in the zero and span adjustments, so there is a dead band when you change the direction of adjustment. Because of the backlash, the simplest procedure, if the desired setting is overshot, is to intentionally overshoot a larger amount before reversing the direction of the adjustment.

DETAIL A	DETAIL B	DETAIL C
Moderate	(To Elevate Zero)	(To Suppress Zero)
Elevation/
Suppression
(No Jumper Wire)	Jumper
	Wire	Jumper
		Wire

Linearity Adjustment

In addition to the span and zero adjustments, there is a linearity adjustment located inside the transmitter on the amplifier board (see Figure 3-4 on page 3-5). Linearity is factory calibrated for optimum performance over the calibrated range of the instrument and is not normally adjusted in the field. If you want to maximize linearity over some particular range, use the following procedure:

3-4